Adiabatic time-optimal quantum controls are extensively used in quantum technologies to break the constraints imposed by short coherence times. However, in practical, it is crucial to consider the trade-off between the quantum evolution speed and instantaneous energy cost of process because of the constraints in the available control Hamiltonian. Here, we experimentally show using a transmon qubit that, even in the presence of vanishing energy gaps, it is possible to reach a highly time-optimal adiabatic quantum driving at low energy cost in the whole evolution process. This validates the recently derived general solution of the quantum Zermelo navigation problem, paving the way for energy-efficient quantum control which is usually overlooked in conventional speed-up schemes, including the well-known counter-diabatic driving. By designing the control Hamiltonian based on the quantum speed limit bound quantified by the changing rate of phase in the interaction picture, we reveal the relationship between the quantum speed limit and instantaneous energy cost. Consequently, we demonstrate fast and high-fidelity quantum adiabatic processes by employing energy-efficient driving strengths, indicating a promising strategy for expanding the applications of time-optimal quantum controls in superconducting quantum circuits.
{"title":"Balancing the quantum speed limit and instantaneous energy cost in adiabatic quantum evolution","authors":"Jianwen Xu, Yujia Zhang, Wen Zheng, Haoyang Cai, Haoyu Zhou, Xianke Li, Xudong Liao, Yu Zhang, Shaoxiong Li, Dong Lan, Xinsheng Tan, Yang Yu","doi":"10.1088/0256-307x/41/4/040202","DOIUrl":"https://doi.org/10.1088/0256-307x/41/4/040202","url":null,"abstract":"\u0000 Adiabatic time-optimal quantum controls are extensively used in quantum technologies to break the constraints imposed by short coherence times. However, in practical, it is crucial to consider the trade-off between the quantum evolution speed and instantaneous energy cost of process because of the constraints in the available control Hamiltonian. Here, we experimentally show using a transmon qubit that, even in the presence of vanishing energy gaps, it is possible to reach a highly time-optimal adiabatic quantum driving at low energy cost in the whole evolution process. This validates the recently derived general solution of the quantum Zermelo navigation problem, paving the way for energy-efficient quantum control which is usually overlooked in conventional speed-up schemes, including the well-known counter-diabatic driving. By designing the control Hamiltonian based on the quantum speed limit bound quantified by the changing rate of phase in the interaction picture, we reveal the relationship between the quantum speed limit and instantaneous energy cost. Consequently, we demonstrate fast and high-fidelity quantum adiabatic processes by employing energy-efficient driving strengths, indicating a promising strategy for expanding the applications of time-optimal quantum controls in superconducting quantum circuits.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"107 34","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140380583","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}
Pub Date : 2024-03-25DOI: 10.1088/0256-307x/41/4/047502
Meng Zhu, J. Dong, Xinlu Li, Fanxing Zheng, Ye Zhou, Kun Wu, Jia Zhang
In comparison to ferromagnets, antiferromagnets are believed to have superior advantages for applications in next-generation magnetic storage devices, including fast spin dynamics, vanishing stray fields and robust against external magnetic field, etc. However, unlike ferromagnetic orders, which could be detected through tunneling magnetoresistance effect in magnetic tunnel junctions, the antiferromagnetic order (i.e., Néel vector) cannot be effectively detected by the similar mechanism due to the spin degeneracy of conventional antiferromagnets. Recently discovered spin-splitting noncollinear antiferromagnets such as Mn3Pt with momentum-dependent spin polarization due to their special magnetic space group, make them possible to achieve remarkable tunneling magnetoresistance effects in noncollinear antiferromagnetic tunnel junctions. Through first-principles calculations, we demonstrate that the tunneling magnetoresistance ratio can reach more than 800% in Mn3Pt/perovskite oxides/Mn3Pt antiferromagnetic tunnel junctions. We also reveal the switching dynamics of Mn3Pt thin film under magnetic fields using atomistic spin dynamic simulation. Our study provides a reliable method for detecting Néel vector of noncollinear antiferromagnets through the tunnel magnetoresistance effect and may pave its way for potential applications in antiferromagnetic memory devices.
{"title":"Magnetic switching dynamics and tunnel magnetoresistance effect based on spin-splitting noncollinear antiferromagnet Mn3Pt","authors":"Meng Zhu, J. Dong, Xinlu Li, Fanxing Zheng, Ye Zhou, Kun Wu, Jia Zhang","doi":"10.1088/0256-307x/41/4/047502","DOIUrl":"https://doi.org/10.1088/0256-307x/41/4/047502","url":null,"abstract":"\u0000 In comparison to ferromagnets, antiferromagnets are believed to have superior advantages for applications in next-generation magnetic storage devices, including fast spin dynamics, vanishing stray fields and robust against external magnetic field, etc. However, unlike ferromagnetic orders, which could be detected through tunneling magnetoresistance effect in magnetic tunnel junctions, the antiferromagnetic order (i.e., Néel vector) cannot be effectively detected by the similar mechanism due to the spin degeneracy of conventional antiferromagnets. Recently discovered spin-splitting noncollinear antiferromagnets such as Mn3Pt with momentum-dependent spin polarization due to their special magnetic space group, make them possible to achieve remarkable tunneling magnetoresistance effects in noncollinear antiferromagnetic tunnel junctions. Through first-principles calculations, we demonstrate that the tunneling magnetoresistance ratio can reach more than 800% in Mn3Pt/perovskite oxides/Mn3Pt antiferromagnetic tunnel junctions. We also reveal the switching dynamics of Mn3Pt thin film under magnetic fields using atomistic spin dynamic simulation. Our study provides a reliable method for detecting Néel vector of noncollinear antiferromagnets through the tunnel magnetoresistance effect and may pave its way for potential applications in antiferromagnetic memory devices.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":" 772","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140382862","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}
Pub Date : 2024-02-29DOI: 10.1088/0256-307x/41/4/044201
Zhengping Yang, W. Zhong, Milivoj R. Belić
This article studies dark localized waves within a nonlinear system based on the Boussinesq approximation, describing the dynamics of shallow water waves. Employing symbolic calculus, we apply the Hirota bilinear method to transform an extended Boussinesq system into a bilinear form, and then use the multiple rogue wave method to obtain its dark rational solutions. Exploring the first- and second-order dark solutions, we examine the conditions under which these localized solutions exist and their spatiotemporal distributions. Through the selection of various parameters and by utilizing different visualization techniques (intensity distributions and contour plots), we explore the dynamical properties of dark solutions found, in particular the first- and second-order dark rogue waves. We also explore the methods of their control. The findings presented here not only deepen the understanding of physical phenomena described by the (1+1)-dimensional Boussinesq equation but also expand avenues for further research. Our method can be extended to other nonlinear systems, to conceivably obtain higher-order dark rogue waves.
{"title":"Dark localized waves in shallow waters: An analysis within an extended Boussinesq system","authors":"Zhengping Yang, W. Zhong, Milivoj R. Belić","doi":"10.1088/0256-307x/41/4/044201","DOIUrl":"https://doi.org/10.1088/0256-307x/41/4/044201","url":null,"abstract":"\u0000 This article studies dark localized waves within a nonlinear system based on the Boussinesq approximation, describing the dynamics of shallow water waves. Employing symbolic calculus, we apply the Hirota bilinear method to transform an extended Boussinesq system into a bilinear form, and then use the multiple rogue wave method to obtain its dark rational solutions. Exploring the first- and second-order dark solutions, we examine the conditions under which these localized solutions exist and their spatiotemporal distributions. Through the selection of various parameters and by utilizing different visualization techniques (intensity distributions and contour plots), we explore the dynamical properties of dark solutions found, in particular the first- and second-order dark rogue waves. We also explore the methods of their control. The findings presented here not only deepen the understanding of physical phenomena described by the (1+1)-dimensional Boussinesq equation but also expand avenues for further research. Our method can be extended to other nonlinear systems, to conceivably obtain higher-order dark rogue waves.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"18 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140413293","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}
Pub Date : 2024-02-28DOI: 10.1088/0256-307x/41/3/034401
Ke-Fan Wu, Hu Zhang, Gui-Hua Tang
Due to the anisotropic fibers and structure distribution, fiber-reinforced composites possess anisotropic mechanical and heat transfer properties. For C/SiC composites, the out-of-plane thermal conductivity was mainly studied whereas the in-plane thermal conductivity received less attentions due to its limited thickness. In this study, the slab module of transient plane source method is adopted to measure the in-plane thermal conductivity of 2D plain woven C/SiC composite slab and the test uncertainty is analyzed numerically for the first time. The numerical investigation proves that the slab module is reliable for measuring the isotropic and anisotropic slabs with in-plane thermal conductivity greater than 10 W·m-1·K-1. The anisotropic thermal conductivity of 2D plain woven C/SiC composite slab is obtained within the temperature range of 20℃-900℃ by combining with the laser flash analysis method to measure the out-of-plane thermal conductivity. The results demonstrate that the out-of-plane thermal conductivity of C/SiC composite decreases with temperature while its in-plane thermal conductivity increases with temperature first and then decreases, and the ratio of in-plane thermal conductivity to out-of-plane thermal conductivity is within 2.2-3.1.
{"title":"Experimental investigation on the anisotropic thermal conductivity of C/SiC composite thin slab","authors":"Ke-Fan Wu, Hu Zhang, Gui-Hua Tang","doi":"10.1088/0256-307x/41/3/034401","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/034401","url":null,"abstract":"\u0000 Due to the anisotropic fibers and structure distribution, fiber-reinforced composites possess anisotropic mechanical and heat transfer properties. For C/SiC composites, the out-of-plane thermal conductivity was mainly studied whereas the in-plane thermal conductivity received less attentions due to its limited thickness. In this study, the slab module of transient plane source method is adopted to measure the in-plane thermal conductivity of 2D plain woven C/SiC composite slab and the test uncertainty is analyzed numerically for the first time. The numerical investigation proves that the slab module is reliable for measuring the isotropic and anisotropic slabs with in-plane thermal conductivity greater than 10 W·m-1·K-1. The anisotropic thermal conductivity of 2D plain woven C/SiC composite slab is obtained within the temperature range of 20℃-900℃ by combining with the laser flash analysis method to measure the out-of-plane thermal conductivity. The results demonstrate that the out-of-plane thermal conductivity of C/SiC composite decreases with temperature while its in-plane thermal conductivity increases with temperature first and then decreases, and the ratio of in-plane thermal conductivity to out-of-plane thermal conductivity is within 2.2-3.1.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"10 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140423095","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}
Polymer-liquid crystals (PLC) is a common material for smart windows. However, PLC smart windows usually require high driving voltage to maintain transparency. In this work, we synthesized a novel PLC smart film by doping multi-wall carbon nanotubes (MWCNT) into a reverse-mode polymer network liquid crystal (R-PNLC). It was found that doping MWCNT could effectively reduce the threshold voltage (V th) of R-PNLC from 19.0V to 8.4V. Due to co-orientation between MWCNT and LC molecules, the doped R-PNLC was able to maintain a high transmittance of visible light (~80%) without an applied electric field. We found that doping MWCNT could change the frequency modulation property of R-PNLC. The doped R-PNLC exhibits a wider frequency modulation range up to 40,000Hz, while the frequency modulation of the undoped R-PNLC reached to a saturation at 23,000 Hz. We also tested the electromagnetic interference (EMI) shielding efficiency of R-PNLC and found that the EMI shielding efficiency could be improved by doping only 0.01wt% MWCNT into the system. The total shielding effectiveness (SET) value of 0.01wt% MWCNT doped R-PNLC was up to 14.91 dB during frequency band of 5.38 GHz-8.17 GHz. This study demonstrates that the films are potentially useful for low-energy-consumption smart windows with enhanced electromagnetic shielding capability.
{"title":"MWCNT Doped Reverse-Mode Polymer Network Liquid Crystals with Frequency Response Property","authors":"Jiajun Li, Dongchao Ji, Zhibo Zhang, Yanan Yang, Ruicong Zhang, Tianyu Wang, Yumin Zhang, Wenxin Cao, Jiaqi Zhu","doi":"10.1088/0256-307x/41/3/038501","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/038501","url":null,"abstract":"\u0000 Polymer-liquid crystals (PLC) is a common material for smart windows. However, PLC smart windows usually require high driving voltage to maintain transparency. In this work, we synthesized a novel PLC smart film by doping multi-wall carbon nanotubes (MWCNT) into a reverse-mode polymer network liquid crystal (R-PNLC). It was found that doping MWCNT could effectively reduce the threshold voltage (V\u0000 th) of R-PNLC from 19.0V to 8.4V. Due to co-orientation between MWCNT and LC molecules, the doped R-PNLC was able to maintain a high transmittance of visible light (~80%) without an applied electric field. We found that doping MWCNT could change the frequency modulation property of R-PNLC. The doped R-PNLC exhibits a wider frequency modulation range up to 40,000Hz, while the frequency modulation of the undoped R-PNLC reached to a saturation at 23,000 Hz. We also tested the electromagnetic interference (EMI) shielding efficiency of R-PNLC and found that the EMI shielding efficiency could be improved by doping only 0.01wt% MWCNT into the system. The total shielding effectiveness (SET) value of 0.01wt% MWCNT doped R-PNLC was up to 14.91 dB during frequency band of 5.38 GHz-8.17 GHz. This study demonstrates that the films are potentially useful for low-energy-consumption smart windows with enhanced electromagnetic shielding capability.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"135 S235","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140428883","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}
Pub Date : 2024-02-07DOI: 10.1088/0256-307x/41/4/047301
Xiao Liu, Mengmeng Wu, Renfei Wang, Xinghao Wang, Wenfeng Zhang, Yujiang Dong, Rui-Rui Du, Yang Liu, Xi Lin
Surface Acoustic Wave (SAW) is a powerful technique for investigating quantum phases appearing in two-dimensional electron systems. The electrons respond to the piezoelectric field of SAW through screening, attenuating its amplitude and shifting its velocity, which is described by the relaxation model. In this work, we systematically study this interaction using orders of magnitude lower SAW amplitude than that in previous studies. At high magnetic fields when electrons form highly correlated states such as the quantum Hall effect, we observe an anomalously large attenuation of SAW while the acoustic speed remains considerably high, inconsistent with the conventional relaxation model. This anomaly exists only when the SAW power is sufficiently low.
{"title":"The Interaction between Surface Acoustic Wave and Quantum Hall Effects","authors":"Xiao Liu, Mengmeng Wu, Renfei Wang, Xinghao Wang, Wenfeng Zhang, Yujiang Dong, Rui-Rui Du, Yang Liu, Xi Lin","doi":"10.1088/0256-307x/41/4/047301","DOIUrl":"https://doi.org/10.1088/0256-307x/41/4/047301","url":null,"abstract":"\u0000 Surface Acoustic Wave (SAW) is a powerful technique for investigating quantum phases appearing in two-dimensional electron systems. The electrons respond to the piezoelectric field of SAW through screening, attenuating its amplitude and shifting its velocity, which is described by the relaxation model. In this work, we systematically study this interaction using orders of magnitude lower SAW amplitude than that in previous studies. At high magnetic fields when electrons form highly correlated states such as the quantum Hall effect, we observe an anomalously large attenuation of SAW while the acoustic speed remains considerably high, inconsistent with the conventional relaxation model. This anomaly exists only when the SAW power is sufficiently low.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"258 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140460685","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}
Pub Date : 2024-01-26DOI: 10.1088/0256-307x/41/3/036101
Dong-Xue Wang, Jing Fu, Yi Li, Zhen Yao, Shuang Liu, Bing-Bing Liu
We proposed a feasible strategy of intercepting the LP-N and HLP-N at ambient conditions by using the confinement templates. The stable mechanism of confined LP-N and HLP-N at ambient conditions is revealed, namely the synergistic effect of charge transfer and vdW confinement effect. The influence rule of interlayer spacing on the stability of LP-N is revealed. Most importantly, the nitrogen content and energy density of recoverable LP-N@graphene (70.59%, 8.15 kJ/g), LP-N@hBN (70.59%, 7.96 kJ/g), HLP-N@graphene (68.97%, 9.31 kJ/g) and HLP-N@h-BN (69.57%, 8.05 kJ/g) refresh the new record for the confinement polynitrogen system.
{"title":"Interception of layered LP-N and HLP-N at ambient conditions by confined template","authors":"Dong-Xue Wang, Jing Fu, Yi Li, Zhen Yao, Shuang Liu, Bing-Bing Liu","doi":"10.1088/0256-307x/41/3/036101","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/036101","url":null,"abstract":"\u0000 We proposed a feasible strategy of intercepting the LP-N and HLP-N at ambient conditions by using the confinement templates. The stable mechanism of confined LP-N and HLP-N at ambient conditions is revealed, namely the synergistic effect of charge transfer and vdW confinement effect. The influence rule of interlayer spacing on the stability of LP-N is revealed. Most importantly, the nitrogen content and energy density of recoverable LP-N@graphene (70.59%, 8.15 kJ/g), LP-N@hBN (70.59%, 7.96 kJ/g), HLP-N@graphene (68.97%, 9.31 kJ/g) and HLP-N@h-BN (69.57%, 8.05 kJ/g) refresh the new record for the confinement polynitrogen system.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"69 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139593528","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}
Pub Date : 2024-01-23DOI: 10.1088/0256-307x/41/2/024101
Yu Lu, Dong-Ao Li, Qianni Li, F. Shao, Tong-Pu Yu
Relativistic femtosecond mid-infrared pulses can be generated efficiently by laser interaction with near-critical-density plasmas. It is found theoretically and numerically that the radiation pressure of a circularly polarized laser pulse first compresses the plasma electrons to form a dense flying mirror with a relativistic high speed. The pulse reflected by the mirror is red-shifted to the mid-infrared range. Full three-dimensional simulations demonstrate that the central wavelength of the mid-infrared pulse is tunable from 3 $rm{mu m}$ to 14 $rm{mu m}$ and the laser energy conversion efficiency can reach as high as 13%. With a 0.5-10 PW incident laser pulse, the generated mid-infrared pulse reaches a peak power of 10-180 TW, which could be interesting for various applications in ultrafast and high-field sciences.
{"title":"Intense mid-infrared laser pulse generated via flying-mirror red-shifting in near-critical-density plasmas","authors":"Yu Lu, Dong-Ao Li, Qianni Li, F. Shao, Tong-Pu Yu","doi":"10.1088/0256-307x/41/2/024101","DOIUrl":"https://doi.org/10.1088/0256-307x/41/2/024101","url":null,"abstract":"\u0000 Relativistic femtosecond mid-infrared pulses can be generated efficiently by laser interaction with near-critical-density plasmas. It is found theoretically and numerically that the radiation pressure of a circularly polarized laser pulse first compresses the plasma electrons to form a dense flying mirror with a relativistic high speed. The pulse reflected by the mirror is red-shifted to the mid-infrared range. Full three-dimensional simulations demonstrate that the central wavelength of the mid-infrared pulse is tunable from 3 $rm{mu m}$ to 14 $rm{mu m}$ and the laser energy conversion efficiency can reach as high as 13%. With a 0.5-10 PW incident laser pulse, the generated mid-infrared pulse reaches a peak power of 10-180 TW, which could be interesting for various applications in ultrafast and high-field sciences.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"117 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139605410","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}
Pub Date : 2024-01-23DOI: 10.1088/0256-307x/41/2/027402
Qiao Jin, Meng Yang, Guozhu Song, Nan Zhao, S. Chen, Haitao Hong, Ting Cui, Dongke Rong, Qianying Wang, Yiyan Fan, Chen Ge, Can Wang, Jiachang Bi, Yanwei Cao, Liusuo Wu, Shanmin Wang, K J Jin, Zhi-Gang Cheng, Er-Jia Guo
Proximity effects between superconductors and ferromagnets (SC/FM) hold paramount importance in comprehending the spin competition transpiring at their interfaces. This competition arises from the interplay between Cooper pairs and ferromagnetic exchange interactions. The proximity effects between transition metal nitrides (TMNs) are scarcely investigated due to the formidable challenges of fabricating high-quality SC/FM interfaces. In this work, we fabricated heterostructures comprising SC titanium nitride (TiN) and FM iron nitride (Fe3N) with precise chemical compositions and atomically well-defined interfaces. The magnetoresistance of Fe3N/TiN heterostructures shows a distinct magnetic anisotropy and strongly depends on the external perturbations. Moreover, the superconducting transition temperature (T C) and critical field of TiN experience notable suppression when proximity to Fe3N. We observe the intriguing competition of interfacial spin orientations near T C (~1.25 K). These findings not only add a new materials system for investigating the interplay between superconductor and ferromagnets, but also potentially provide a building block for future research endeavors and applications in the realms of superconducting spintronic devices.
超导体和铁磁体（SC/FM）之间的邻近效应对于理解它们界面上发生的自旋竞争至关重要。这种竞争产生于库珀对和铁磁交换相互作用之间的相互作用。过渡金属氮化物（TMNs）之间的邻近效应极少被研究，原因是制造高质量的 SC/FM 界面是一项艰巨的挑战。在这项工作中，我们制造了由具有精确化学成分和原子定义良好界面的超导氮化钛（TiN）和调频氮化铁（Fe3N）组成的异质结构。Fe3N/TiN异质结构的磁阻显示出明显的磁各向异性，并强烈依赖于外部扰动。此外，当靠近 Fe3N 时，TiN 的超导转变温度（T C）和临界磁场会受到明显的抑制。我们观察到在 T C 附近（~1.25 K）界面自旋取向的竞争非常有趣。这些发现不仅为研究超导体与铁磁体之间的相互作用增添了一种新的材料体系，而且还可能为超导自旋电子器件领域的未来研究工作和应用提供一个基石。
{"title":"Strong anisotropic order parameters at all-nitride ferromagnet/superconductor interfaces","authors":"Qiao Jin, Meng Yang, Guozhu Song, Nan Zhao, S. Chen, Haitao Hong, Ting Cui, Dongke Rong, Qianying Wang, Yiyan Fan, Chen Ge, Can Wang, Jiachang Bi, Yanwei Cao, Liusuo Wu, Shanmin Wang, K J Jin, Zhi-Gang Cheng, Er-Jia Guo","doi":"10.1088/0256-307x/41/2/027402","DOIUrl":"https://doi.org/10.1088/0256-307x/41/2/027402","url":null,"abstract":"\u0000 Proximity effects between superconductors and ferromagnets (SC/FM) hold paramount importance in comprehending the spin competition transpiring at their interfaces. This competition arises from the interplay between Cooper pairs and ferromagnetic exchange interactions. The proximity effects between transition metal nitrides (TMNs) are scarcely investigated due to the formidable challenges of fabricating high-quality SC/FM interfaces. In this work, we fabricated heterostructures comprising SC titanium nitride (TiN) and FM iron nitride (Fe3N) with precise chemical compositions and atomically well-defined interfaces. The magnetoresistance of Fe3N/TiN heterostructures shows a distinct magnetic anisotropy and strongly depends on the external perturbations. Moreover, the superconducting transition temperature (T\u0000 C) and critical field of TiN experience notable suppression when proximity to Fe3N. We observe the intriguing competition of interfacial spin orientations near T\u0000 C (~1.25 K). These findings not only add a new materials system for investigating the interplay between superconductor and ferromagnets, but also potentially provide a building block for future research endeavors and applications in the realms of superconducting spintronic devices.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"130 25","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139604936","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}
Pub Date : 2024-01-18DOI: 10.1088/0256-307x/41/2/020503
Jin-Yi Wang, Lei-Lei Nian, Jing-Tao Lü
Coupling quantum-dot circuits to microwave photons allows one to study the photon-assisted quantum transport. Here, we revisit this typical circuit quantum electrodynamical setup by introducing the Kerr nonlinearity of photons. By exploiting a quantum critical behavior, we propose a powerful scheme to control the power harvesting efficiency in the microwave regime, where the driven-dissipative optical system acts as an energy pump. It drives electron transport against a load in quantum-dot circuit. The energy transfer and consequently the harvesting efficiency is enhanced near the critical point. As the critical point moves towards to low input power, the high efficiency within experimental parameters is achieved. Our results complement fundamental studies of photon-to-electron conversion at the nanoscale, and provide practical guidance for the design of integrated photoelectric device by the quantum criticality.
{"title":"Engineering quantum criticality for quantum dot power harvesting","authors":"Jin-Yi Wang, Lei-Lei Nian, Jing-Tao Lü","doi":"10.1088/0256-307x/41/2/020503","DOIUrl":"https://doi.org/10.1088/0256-307x/41/2/020503","url":null,"abstract":"\u0000 Coupling quantum-dot circuits to microwave photons allows one to study the photon-assisted quantum transport. Here, we revisit this typical circuit quantum electrodynamical setup by introducing the Kerr nonlinearity of photons. By exploiting a quantum critical behavior, we propose a powerful scheme to control the power harvesting efficiency in the microwave regime, where the driven-dissipative optical system acts as an energy pump. It drives electron transport against a load in quantum-dot circuit. The energy transfer and consequently the harvesting efficiency is enhanced near the critical point. As the critical point moves towards to low input power, the high efficiency within experimental parameters is achieved. Our results complement fundamental studies of photon-to-electron conversion at the nanoscale, and provide practical guidance for the design of integrated photoelectric device by the quantum criticality.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"112 41","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139615443","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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