Mathieu Padlewski, Xinxin Guo, Maxime Volery, Romain Fleury, Hervé Lissek
Precise wave manipulation has undoubtedly forged the technological landscape we thrive in today. Although our understanding of wave phenomena has come a long way since the earliest observations of desert dunes or ocean waves, the unimpeded development of mathematics has enabled ever more complex and exotic physical phenomena to be comprehensively described. Here, we take wave manipulation a step further by introducing an unprecedented synthetic acoustic crystal capable of realizing simultaneous linear broadband conduction and nonlinear topological insulation, depicting a robust amplitude-dependent mode localized deep within - i.e. an amplitude-driven topological confinement of sound. The latter is achieved by means of an open acoustic waveguide lined with a chain of nonlocally and nonlinearly coupled active electroacoustic resonators. Starting from a comprehensive topological model for classical waves, we demonstrate that different topological regimes can be accessed by increasing driving amplitude and that topological robustness against coupling disorder is a direct consequence of symmetric and simultaneous response between coupled resonators. Theoretical predictions are validated by a fully programmable experimental apparatus capable of realizing the real-time manipulation of metacrystal properties. In all, our results provide a solid foundation for future research in the design and manipulation of classical waves in artificial materials involving nonlinearity, nonlocality, and non-hermiticity.
{"title":"Hybrid broadband conduction and amplitude-driven topological confinement of sound via syntheticacoustic crystals","authors":"Mathieu Padlewski, Xinxin Guo, Maxime Volery, Romain Fleury, Hervé Lissek","doi":"arxiv-2408.16801","DOIUrl":"https://doi.org/arxiv-2408.16801","url":null,"abstract":"Precise wave manipulation has undoubtedly forged the technological landscape\u0000we thrive in today. Although our understanding of wave phenomena has come a\u0000long way since the earliest observations of desert dunes or ocean waves, the\u0000unimpeded development of mathematics has enabled ever more complex and exotic\u0000physical phenomena to be comprehensively described. Here, we take wave\u0000manipulation a step further by introducing an unprecedented synthetic acoustic\u0000crystal capable of realizing simultaneous linear broadband conduction and\u0000nonlinear topological insulation, depicting a robust amplitude-dependent mode\u0000localized deep within - i.e. an amplitude-driven topological confinement of\u0000sound. The latter is achieved by means of an open acoustic waveguide lined with\u0000a chain of nonlocally and nonlinearly coupled active electroacoustic\u0000resonators. Starting from a comprehensive topological model for classical\u0000waves, we demonstrate that different topological regimes can be accessed by\u0000increasing driving amplitude and that topological robustness against coupling\u0000disorder is a direct consequence of symmetric and simultaneous response between\u0000coupled resonators. Theoretical predictions are validated by a fully\u0000programmable experimental apparatus capable of realizing the real-time\u0000manipulation of metacrystal properties. In all, our results provide a solid\u0000foundation for future research in the design and manipulation of classical\u0000waves in artificial materials involving nonlinearity, nonlocality, and\u0000non-hermiticity.","PeriodicalId":501083,"journal":{"name":"arXiv - PHYS - Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yang Liu, Jiarui Gong, Sudip Acharya, Yiran Lia, Alireza Abrand, Justin M. Rudie, Jie Zhou, Yi Lu, Haris Naeem Abbasi, Daniel Vincent, Samuel Haessly, Tsung-Han Tsai, Parsian K. Mohseni, Shui-Qing Yu, Zhenqiang Ma
GeSn-based SWIR lasers featuring imaging, sensing, and communications has gained dynamic development recently. However, the existing SiGeSn/GeSn double heterostructure lacks adequate electron confinement and is insufficient for room temperature lasing. The recently demonstrated semiconductor grafting technique provides a viable approach towards AlGaAs/GeSn p-i-n heterojunctions with better electron confinement and high-quality interfaces, promising for room temperature electrically pumped GeSn laser devices. Therefore, understanding and quantitatively characterizing the band alignment in this grafted heterojunction is crucial. In this study, we explore the band alignment in the grafted monocrystalline Al0.3Ga0.7As /Ge0.853Sn0.147 p-i-n heterojunction. We determined the bandgap values of AlGaAs and GeSn to be 1.81 eV and 0.434 eV by photoluminescence measurements, respectively. We further conducted X-ray photoelectron spectroscopy measurements and extracted a valence band offset of 0.19 eV and a conduction band offset of 1.186 eV. A Type-I band alignment was confirmed which effectively confining electrons at the AlGaAs/GeSn interface. This study improves our understanding of the interfacial band structure in grafted AlGaAs/GeSn heterostructure, providing experimental evidence of the Type-I band alignment between AlGaAs and GeSn, and paving the way for their application in laser technologies.
{"title":"Characterization of AlGaAs/GeSn heterojunction band alignment via X-ray photoelectron spectroscopy","authors":"Yang Liu, Jiarui Gong, Sudip Acharya, Yiran Lia, Alireza Abrand, Justin M. Rudie, Jie Zhou, Yi Lu, Haris Naeem Abbasi, Daniel Vincent, Samuel Haessly, Tsung-Han Tsai, Parsian K. Mohseni, Shui-Qing Yu, Zhenqiang Ma","doi":"arxiv-2408.16884","DOIUrl":"https://doi.org/arxiv-2408.16884","url":null,"abstract":"GeSn-based SWIR lasers featuring imaging, sensing, and communications has\u0000gained dynamic development recently. However, the existing SiGeSn/GeSn double\u0000heterostructure lacks adequate electron confinement and is insufficient for\u0000room temperature lasing. The recently demonstrated semiconductor grafting\u0000technique provides a viable approach towards AlGaAs/GeSn p-i-n heterojunctions\u0000with better electron confinement and high-quality interfaces, promising for\u0000room temperature electrically pumped GeSn laser devices. Therefore,\u0000understanding and quantitatively characterizing the band alignment in this\u0000grafted heterojunction is crucial. In this study, we explore the band alignment\u0000in the grafted monocrystalline Al0.3Ga0.7As /Ge0.853Sn0.147 p-i-n\u0000heterojunction. We determined the bandgap values of AlGaAs and GeSn to be 1.81\u0000eV and 0.434 eV by photoluminescence measurements, respectively. We further\u0000conducted X-ray photoelectron spectroscopy measurements and extracted a valence\u0000band offset of 0.19 eV and a conduction band offset of 1.186 eV. A Type-I band\u0000alignment was confirmed which effectively confining electrons at the\u0000AlGaAs/GeSn interface. This study improves our understanding of the interfacial\u0000band structure in grafted AlGaAs/GeSn heterostructure, providing experimental\u0000evidence of the Type-I band alignment between AlGaAs and GeSn, and paving the\u0000way for their application in laser technologies.","PeriodicalId":501083,"journal":{"name":"arXiv - PHYS - Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sebastian Lukas, Ardeshir Esteki, Nico Rademacher, Vikas Jangra, Michael Gross, Zhenxing Wang, Ha Duong Ngo, Manuel Bäuscher, Piotr Mackowiak, Katrin Höppner, Dominique Wehenkel, Richard van Rijn, Max C. Lemme
Suspended membranes of monoatomic graphene exhibit great potential for applications in electronic and nanoelectromechanical devices. In this work, a "hot and dry" transfer process is demonstrated to address the fabrication and patterning challenges of large-area graphene membranes on top of closed, sealed cavities. Here, "hot" refers to the use of high temperature during transfer, promoting the adhesion. Additionally, "dry" refers to the absence of liquids when graphene and target substrate are brought into contact. The method leads to higher yields of intact suspended monolayer CVD graphene and artificially stacked double-layer CVD graphene membranes than previously reported. The yield evaluation is performed using neural-network-based object detection in SEM images, ascertaining high yields of intact membranes with large statistical accuracy. The suspended membranes are examined by Raman tomography and AFM. The method is verified by applying the suspended graphene devices as piezoresistive pressure sensors. Our technology advances the application of suspended graphene membranes and can be extended to other two-dimensional (2D) materials.
{"title":"High-yield large-scale suspended graphene membranes over closed cavities for sensor applications","authors":"Sebastian Lukas, Ardeshir Esteki, Nico Rademacher, Vikas Jangra, Michael Gross, Zhenxing Wang, Ha Duong Ngo, Manuel Bäuscher, Piotr Mackowiak, Katrin Höppner, Dominique Wehenkel, Richard van Rijn, Max C. Lemme","doi":"arxiv-2408.16408","DOIUrl":"https://doi.org/arxiv-2408.16408","url":null,"abstract":"Suspended membranes of monoatomic graphene exhibit great potential for\u0000applications in electronic and nanoelectromechanical devices. In this work, a\u0000\"hot and dry\" transfer process is demonstrated to address the fabrication and\u0000patterning challenges of large-area graphene membranes on top of closed, sealed\u0000cavities. Here, \"hot\" refers to the use of high temperature during transfer,\u0000promoting the adhesion. Additionally, \"dry\" refers to the absence of liquids\u0000when graphene and target substrate are brought into contact. The method leads\u0000to higher yields of intact suspended monolayer CVD graphene and artificially\u0000stacked double-layer CVD graphene membranes than previously reported. The yield\u0000evaluation is performed using neural-network-based object detection in SEM\u0000images, ascertaining high yields of intact membranes with large statistical\u0000accuracy. The suspended membranes are examined by Raman tomography and AFM. The\u0000method is verified by applying the suspended graphene devices as piezoresistive\u0000pressure sensors. Our technology advances the application of suspended graphene\u0000membranes and can be extended to other two-dimensional (2D) materials.","PeriodicalId":501083,"journal":{"name":"arXiv - PHYS - Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Raphaela de Oliveira, Ana Beatriz Yoshida, Cesar Rabahi, Raul O. Freitas, Christiano J. S. de Matos, Yara Galvão Gobato, Ingrid D. Barcelos, Alisson R. Cadore
Biotite, an iron-rich mineral belonging to the trioctahedral mica group, is a naturally abundant layered material (LM) exhibiting attractive electronic properties for application in nanodevices. Biotite stands out as a non-degradable LM under ambient conditions, featuring high-quality basal cleavage, a significant advantage for van der Waals heterostructure (vdWH) applications. In this work, we present the micro-mechanical exfoliation of biotite down to monolayers (1Ls), yielding ultrathin flakes with large areas and atomically flat surfaces. To identify and characterize the mineral, we conducted a multi-elemental analysis of biotite using energy-dispersive spectroscopy mapping. Additionally, synchrotron infrared nano-spectroscopy was employed to probe its vibrational signature in few-layer form, with sensitivity to the layer number. We have also observed good morphological and structural stability in time (up to 12 months) and no important changes in their physical properties after thermal annealing processes in ultrathin biotite flakes. Conductive atomic force microscopy evaluated its electrical capacity, revealing an electrical breakdown strength of approximately 1 V/nm. Finally, we explore the use of biotite as a substrate and encapsulating LM in vdWH applications. We have performed optical and magneto-optical measurements at low temperatures. We find that ultrathin biotite flakes work as a good substrate for 1L-MoSe2, comparable to hexagonal boron nitride flakes, but it induces a small change of the 1L-MoSe2 g-factor values, most likely due to natural impurities on its crystal structure. Furthermore, our results show that biotite flakes are useful systems to protect sensitive LMs such as black phosphorus from degradation for up to 60 days in ambient air. Our study introduces biotite as a promising, cost-effective LM for the advancement of future ultrathin nanotechnologies.
{"title":"Ultrathin natural biotite crystals as a dielectric layer for van der Waals heterostructure applications","authors":"Raphaela de Oliveira, Ana Beatriz Yoshida, Cesar Rabahi, Raul O. Freitas, Christiano J. S. de Matos, Yara Galvão Gobato, Ingrid D. Barcelos, Alisson R. Cadore","doi":"arxiv-2408.16697","DOIUrl":"https://doi.org/arxiv-2408.16697","url":null,"abstract":"Biotite, an iron-rich mineral belonging to the trioctahedral mica group, is a\u0000naturally abundant layered material (LM) exhibiting attractive electronic\u0000properties for application in nanodevices. Biotite stands out as a\u0000non-degradable LM under ambient conditions, featuring high-quality basal\u0000cleavage, a significant advantage for van der Waals heterostructure (vdWH)\u0000applications. In this work, we present the micro-mechanical exfoliation of\u0000biotite down to monolayers (1Ls), yielding ultrathin flakes with large areas\u0000and atomically flat surfaces. To identify and characterize the mineral, we\u0000conducted a multi-elemental analysis of biotite using energy-dispersive\u0000spectroscopy mapping. Additionally, synchrotron infrared nano-spectroscopy was\u0000employed to probe its vibrational signature in few-layer form, with sensitivity\u0000to the layer number. We have also observed good morphological and structural\u0000stability in time (up to 12 months) and no important changes in their physical\u0000properties after thermal annealing processes in ultrathin biotite flakes.\u0000Conductive atomic force microscopy evaluated its electrical capacity, revealing\u0000an electrical breakdown strength of approximately 1 V/nm. Finally, we explore\u0000the use of biotite as a substrate and encapsulating LM in vdWH applications. We\u0000have performed optical and magneto-optical measurements at low temperatures. We\u0000find that ultrathin biotite flakes work as a good substrate for 1L-MoSe2,\u0000comparable to hexagonal boron nitride flakes, but it induces a small change of\u0000the 1L-MoSe2 g-factor values, most likely due to natural impurities on its\u0000crystal structure. Furthermore, our results show that biotite flakes are useful\u0000systems to protect sensitive LMs such as black phosphorus from degradation for\u0000up to 60 days in ambient air. Our study introduces biotite as a promising,\u0000cost-effective LM for the advancement of future ultrathin nanotechnologies.","PeriodicalId":501083,"journal":{"name":"arXiv - PHYS - Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Barry P Lawlor, Vatsa Gandhi, Guruswami Ravichandran
The dynamic collapse of pores under shock loading is thought to be directly related to hot spot generation and material failure, which is critical to the performance of porous energetic and structural materials. However, the shock compression response of porous materials at the local, individual pore scale is not well understood. This study examines, quantitatively, the collapse phenomenon of a single spherical void in PMMA at shock stresses ranging from 0.4-1.0 GPa. Using a newly developed internal digital image correlation technique in conjunction with plate impact experiments, full-field quantitative deformation measurements are conducted in the material surrounding the collapsing pore for the first time. The experimental results reveal two failure mode transitions as shock stress is increased: (i) the first in-situ evidence of shear localization via adiabatic shear banding and (ii) dynamic fracture initiation at the pore surface. Numerical simulations using thermo-viscoplastic dynamic finite element analysis provide insights into the formation of adiabatic shear bands (ASBs) and stresses at which failure mode transitions occur. Further numerical and theoretical modeling indicates the dynamic fracture to occur along the weakened material inside an adiabatic shear band. Finally, analysis of the evolution of pore asymmetry and models for ASB spacing elucidate the mechanisms for the shear band initiation sites, and elastostatic theory explains the experimentally observed ASB and fracture paths based on the directions of maximum shear.
{"title":"Full-Field Quantitative Visualization of Shock-Driven Pore Collapse and Failure Modes in PMMA","authors":"Barry P Lawlor, Vatsa Gandhi, Guruswami Ravichandran","doi":"arxiv-2408.16931","DOIUrl":"https://doi.org/arxiv-2408.16931","url":null,"abstract":"The dynamic collapse of pores under shock loading is thought to be directly\u0000related to hot spot generation and material failure, which is critical to the\u0000performance of porous energetic and structural materials. However, the shock\u0000compression response of porous materials at the local, individual pore scale is\u0000not well understood. This study examines, quantitatively, the collapse\u0000phenomenon of a single spherical void in PMMA at shock stresses ranging from\u00000.4-1.0 GPa. Using a newly developed internal digital image correlation\u0000technique in conjunction with plate impact experiments, full-field quantitative\u0000deformation measurements are conducted in the material surrounding the\u0000collapsing pore for the first time. The experimental results reveal two failure\u0000mode transitions as shock stress is increased: (i) the first in-situ evidence\u0000of shear localization via adiabatic shear banding and (ii) dynamic fracture\u0000initiation at the pore surface. Numerical simulations using thermo-viscoplastic\u0000dynamic finite element analysis provide insights into the formation of\u0000adiabatic shear bands (ASBs) and stresses at which failure mode transitions\u0000occur. Further numerical and theoretical modeling indicates the dynamic\u0000fracture to occur along the weakened material inside an adiabatic shear band.\u0000Finally, analysis of the evolution of pore asymmetry and models for ASB spacing\u0000elucidate the mechanisms for the shear band initiation sites, and elastostatic\u0000theory explains the experimentally observed ASB and fracture paths based on the\u0000directions of maximum shear.","PeriodicalId":501083,"journal":{"name":"arXiv - PHYS - Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yimeng Sun, Linjuan Wang, Huiling Duan, Jianxiang Wang
$mathbb{Z}$-classified topological phases lead to larger-than-unity topological states. However, these multiple topological states are only localized at the corners in nonlocal systems. Here, first, we rigorously prove that the multiple topological states of nonlocal Su-Schrieffer-Heeger (SSH) chains can be inherited and realized by local aperiodic chains with only the nearest couplings. Then, we report a new class of higher-order topological insulators constructed with the local aperiodic chains, which can have any integer number of 0D topological states localized at arbitrary positions in the whole domain of the insulators, including within the bulk. The 0D topological states are protected by the local topological marker in each direction, instead of the bulk multipole chiral numbers in the existing work. Our work provides multiple combinations of localized corner-bulk topological states, which enables programmable lasers and sasers by selecting the excitation sites without altering the structure, and thus opens a new avenue to signal enhancement for computing and sensing.
{"title":"A new class of higher-order topological insulators that localize energy at arbitrary multiple sites","authors":"Yimeng Sun, Linjuan Wang, Huiling Duan, Jianxiang Wang","doi":"arxiv-2408.04807","DOIUrl":"https://doi.org/arxiv-2408.04807","url":null,"abstract":"$mathbb{Z}$-classified topological phases lead to larger-than-unity\u0000topological states. However, these multiple topological states are only\u0000localized at the corners in nonlocal systems. Here, first, we rigorously prove\u0000that the multiple topological states of nonlocal Su-Schrieffer-Heeger (SSH)\u0000chains can be inherited and realized by local aperiodic chains with only the\u0000nearest couplings. Then, we report a new class of higher-order topological\u0000insulators constructed with the local aperiodic chains, which can have any\u0000integer number of 0D topological states localized at arbitrary positions in the\u0000whole domain of the insulators, including within the bulk. The 0D topological\u0000states are protected by the local topological marker in each direction, instead\u0000of the bulk multipole chiral numbers in the existing work. Our work provides\u0000multiple combinations of localized corner-bulk topological states, which\u0000enables programmable lasers and sasers by selecting the excitation sites\u0000without altering the structure, and thus opens a new avenue to signal\u0000enhancement for computing and sensing.","PeriodicalId":501083,"journal":{"name":"arXiv - PHYS - Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Daehun Lee, Yue Jiang, Xiaoru Zhang, Shahin Jahanbani, Chengyu Wen, Qicheng Zhang, A. T. Charlie Johnson, Keji Lai
Klein tunneling, the perfect transmission of a normally incident relativistic particle through an energy barrier, has been tested in various electronic, photonic, and phononic systems. Its potential in guiding and filtering classical waves in the Ultra High Frequency regime, on the other hand, has not been explored. Here, we report the realization of acoustic Klein tunneling in a nanoelectromechanical metamaterial system operating at gigahertz frequencies. The piezoelectric potential profiles are obtained by transmission-mode microwave impedance microscopy, from which reciprocal-space maps can be extracted. The transmission rate of normally incident elastic waves is near unity in the Klein tunneling regime and drops significantly outside this frequency range, consistent with microwave network analysis. Strong angular dependent transmission is also observed by controlling the launching angle of the emitter interdigital transducer. This work broadens the horizon in exploiting high-energy-physics phenomena for practical circuit applications in both classical and quantum regimes.
{"title":"Klein Tunneling of Gigahertz Elastic Waves in Nanoelectromechanical Metamaterials","authors":"Daehun Lee, Yue Jiang, Xiaoru Zhang, Shahin Jahanbani, Chengyu Wen, Qicheng Zhang, A. T. Charlie Johnson, Keji Lai","doi":"arxiv-2408.04473","DOIUrl":"https://doi.org/arxiv-2408.04473","url":null,"abstract":"Klein tunneling, the perfect transmission of a normally incident relativistic\u0000particle through an energy barrier, has been tested in various electronic,\u0000photonic, and phononic systems. Its potential in guiding and filtering\u0000classical waves in the Ultra High Frequency regime, on the other hand, has not\u0000been explored. Here, we report the realization of acoustic Klein tunneling in a\u0000nanoelectromechanical metamaterial system operating at gigahertz frequencies.\u0000The piezoelectric potential profiles are obtained by transmission-mode\u0000microwave impedance microscopy, from which reciprocal-space maps can be\u0000extracted. The transmission rate of normally incident elastic waves is near\u0000unity in the Klein tunneling regime and drops significantly outside this\u0000frequency range, consistent with microwave network analysis. Strong angular\u0000dependent transmission is also observed by controlling the launching angle of\u0000the emitter interdigital transducer. This work broadens the horizon in\u0000exploiting high-energy-physics phenomena for practical circuit applications in\u0000both classical and quantum regimes.","PeriodicalId":501083,"journal":{"name":"arXiv - PHYS - Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bowei Wu, Tingfeng Ma, Shuanghuizhi Li, Boyue Su, Pengfei Kang
In this work, topological resonance behaviors of surface acoustic wave (SAW) under surface liquid-layer loadings are investigated. The results show that through the coupling of waveguide and resonant cavity, a resonant peak with high Q-factor can emerge, and the frequency of which is significantly sensitive to the liquid parameters. Based on that, a topological-resonance SAW liquid-phase sensor is proposed. The results show that the formation of the topological phase transition is closely related to the liquid-layer loading. Furthermore, by changing the thickness of the liquid-layer loading, the operating-frequency range of the device can be significantly expanded, which is vital for biomedical detecting applications. Based on which, the sensing performances of topological-resonance SAW liquid-phase sensor are simulated, which are used to sensing the concentration of albumin and hemoglobin concentration in blood, and high sensitivities and Q-factors can be obtained for this device. The results presented in this paper can provide an important basis for the realization of highly sensitive and stable SAW biomedical sensors in the future.
{"title":"Topological resonance behaviors of surface acoustic wave under surface liquid-layer loadings and sensing applications","authors":"Bowei Wu, Tingfeng Ma, Shuanghuizhi Li, Boyue Su, Pengfei Kang","doi":"arxiv-2408.04468","DOIUrl":"https://doi.org/arxiv-2408.04468","url":null,"abstract":"In this work, topological resonance behaviors of surface acoustic wave (SAW)\u0000under surface liquid-layer loadings are investigated. The results show that\u0000through the coupling of waveguide and resonant cavity, a resonant peak with\u0000high Q-factor can emerge, and the frequency of which is significantly sensitive\u0000to the liquid parameters. Based on that, a topological-resonance SAW\u0000liquid-phase sensor is proposed. The results show that the formation of the\u0000topological phase transition is closely related to the liquid-layer loading.\u0000Furthermore, by changing the thickness of the liquid-layer loading, the\u0000operating-frequency range of the device can be significantly expanded, which is\u0000vital for biomedical detecting applications. Based on which, the sensing\u0000performances of topological-resonance SAW liquid-phase sensor are simulated,\u0000which are used to sensing the concentration of albumin and hemoglobin\u0000concentration in blood, and high sensitivities and Q-factors can be obtained\u0000for this device. The results presented in this paper can provide an important\u0000basis for the realization of highly sensitive and stable SAW biomedical sensors\u0000in the future.","PeriodicalId":501083,"journal":{"name":"arXiv - PHYS - Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Seyed Saleh Mousavi Khaleghi, Jianyong Wei, Yumeng Liu, Zhengfang Fan, Kai Li, Kenneth B. Crozier, Yaping Dan
Photodetectors based on two-dimensional (2D) atomically thin semiconductors suffer from low light absorption, limiting their potential for practical applications. In this work, we demonstrate a high-performance MoS2 phototransistors by integrating few-layer MoS2 on a PN junction formed in a silicon (Si) substrate. The photovoltage created in the PN junction under light illumination electrically gates the MoS2 channel, creating a strong photoresponse in MoS2. We present an analytical model for the photoresponse of our device and show that it is in good agreement with measured experimental photocurrent in MoS2 and photovoltage in the Si PN junction. This device structure separates light absorption and electrical response functions, which provides us an opportunity to design new types of photodetectors. For example, incorporating ferroelectric materials into the gate structure can produce a negative capacitance that boosts gate voltage, enabling low power, high sensitivity phototransistor; this, combined with separating light absorption and electrical functions, enables advanced high-performance photodetectors.
{"title":"High Performance MoS2 Phototransistors Photogated by PN Junction","authors":"Seyed Saleh Mousavi Khaleghi, Jianyong Wei, Yumeng Liu, Zhengfang Fan, Kai Li, Kenneth B. Crozier, Yaping Dan","doi":"arxiv-2408.04141","DOIUrl":"https://doi.org/arxiv-2408.04141","url":null,"abstract":"Photodetectors based on two-dimensional (2D) atomically thin semiconductors\u0000suffer from low light absorption, limiting their potential for practical\u0000applications. In this work, we demonstrate a high-performance MoS2\u0000phototransistors by integrating few-layer MoS2 on a PN junction formed in a\u0000silicon (Si) substrate. The photovoltage created in the PN junction under light\u0000illumination electrically gates the MoS2 channel, creating a strong\u0000photoresponse in MoS2. We present an analytical model for the photoresponse of\u0000our device and show that it is in good agreement with measured experimental\u0000photocurrent in MoS2 and photovoltage in the Si PN junction. This device\u0000structure separates light absorption and electrical response functions, which\u0000provides us an opportunity to design new types of photodetectors. For example,\u0000incorporating ferroelectric materials into the gate structure can produce a\u0000negative capacitance that boosts gate voltage, enabling low power, high\u0000sensitivity phototransistor; this, combined with separating light absorption\u0000and electrical functions, enables advanced high-performance photodetectors.","PeriodicalId":501083,"journal":{"name":"arXiv - PHYS - Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mathis Degeorges, Jyothis Anand, Nithin Jo Varghese, Jyotirmoy Mandal
We demonstrate a micropatterned directional emitter ({mu}DE) with an ultrabroadband, azimuthally selective and tailorable emittance across the thermal wavelengths and over wide angles. The {mu}DE can enable a novel and passive seasonal thermoregulation of buildings by reducing summertime terrestrial radiative heat gain, and wintertime loss. We show several types of {mu}DE, such as metallic and white variants, made using low-cost materials and scalable manufacturing techniques that are already in large-scale use. Furthermore, we show that its directional emittance can be geometrically tailored to sky-view factors in different urban scenarios. Outdoor experiments show that {mu}DEs stay up to 1.53{deg}C cooler than traditional building envelopes when exposed to direct sunlight on summer days and up to 0.46{deg}C warmer during winter nights. Additionally, {mu}DEs demonstrate significant cooling powers of up to 40 Wm-2 in warm conditions and heating powers of up to 30 Wm-2 in cool conditions, relative to typical building envelopes. Building energy models show that {mu}DEs can achieve all-season energy savings similar to or higher than those of cool roofs. Collectively, our findings show {mu}DEs as highly promising for thermoregulating buildings.
{"title":"Radiative Cooling and Thermoregulation of Vertical Facades with Micropatterned Directional Emitters","authors":"Mathis Degeorges, Jyothis Anand, Nithin Jo Varghese, Jyotirmoy Mandal","doi":"arxiv-2408.03512","DOIUrl":"https://doi.org/arxiv-2408.03512","url":null,"abstract":"We demonstrate a micropatterned directional emitter ({mu}DE) with an\u0000ultrabroadband, azimuthally selective and tailorable emittance across the\u0000thermal wavelengths and over wide angles. The {mu}DE can enable a novel and\u0000passive seasonal thermoregulation of buildings by reducing summertime\u0000terrestrial radiative heat gain, and wintertime loss. We show several types of\u0000{mu}DE, such as metallic and white variants, made using low-cost materials and\u0000scalable manufacturing techniques that are already in large-scale use.\u0000Furthermore, we show that its directional emittance can be geometrically\u0000tailored to sky-view factors in different urban scenarios. Outdoor experiments\u0000show that {mu}DEs stay up to 1.53{deg}C cooler than traditional building\u0000envelopes when exposed to direct sunlight on summer days and up to 0.46{deg}C\u0000warmer during winter nights. Additionally, {mu}DEs demonstrate significant\u0000cooling powers of up to 40 Wm-2 in warm conditions and heating powers of up to\u000030 Wm-2 in cool conditions, relative to typical building envelopes. Building\u0000energy models show that {mu}DEs can achieve all-season energy savings similar\u0000to or higher than those of cool roofs. Collectively, our findings show {mu}DEs\u0000as highly promising for thermoregulating buildings.","PeriodicalId":501083,"journal":{"name":"arXiv - PHYS - Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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