Rohit Kumar, D. Session, R. Tsuchikawa, Mario Homer, Harrison Paas, Kenji Watanabe, T. Taniguchi, V. Deshpande
2D materials such as graphene and hexagonal-boron nitride (h-BN), to name a few, when layered on top of each other offer a class of metamaterials with interesting properties. For example, the twisting degree of freedom between two layers has started the field of twistronics. The exceptional attributes of 2D materials like ultra-low mass, robustness, and high tunability make them very suitable for nanoelectromechanical systems (NEMS). Yet the mechanical properties of these heterostructures in the form of NEMS have not been studied extensively. Such 2D NEMS hold promise for various technological applications, namely, ultrafast sensors, actuators, etc. We report fabrication and characterization of h-BN graphene heterostructure-based circular nanoelectromechanical resonators on sapphire substrates. The devices are measured at cryogenic temperatures and exhibit multiple mode frequencies, which are highly tunable with gate voltage. A continuum mechanics model is employed to analyze the transmission (S21) data of the fundamental mode. Parameters like built-in tension obtained from the fit are used to identify the indices (m, n) of higher mechanical modes observed for the device, providing further device characterization. Such 2D NEMS could offer a way to study diverse electronic phenomena such as superconductivity in twisted bilayer graphene (tBLG) heterostructures.
{"title":"Circular electromechanical resonators based on hexagonal-boron nitride-graphene heterostructures","authors":"Rohit Kumar, D. Session, R. Tsuchikawa, Mario Homer, Harrison Paas, Kenji Watanabe, T. Taniguchi, V. Deshpande","doi":"10.1063/5.0024583","DOIUrl":"https://doi.org/10.1063/5.0024583","url":null,"abstract":"2D materials such as graphene and hexagonal-boron nitride (h-BN), to name a few, when layered on top of each other offer a class of metamaterials with interesting properties. For example, the twisting degree of freedom between two layers has started the field of twistronics. The exceptional attributes of 2D materials like ultra-low mass, robustness, and high tunability make them very suitable for nanoelectromechanical systems (NEMS). Yet the mechanical properties of these heterostructures in the form of NEMS have not been studied extensively. Such 2D NEMS hold promise for various technological applications, namely, ultrafast sensors, actuators, etc. We report fabrication and characterization of h-BN graphene heterostructure-based circular nanoelectromechanical resonators on sapphire substrates. The devices are measured at cryogenic temperatures and exhibit multiple mode frequencies, which are highly tunable with gate voltage. A continuum mechanics model is employed to analyze the transmission (S21) data of the fundamental mode. Parameters like built-in tension obtained from the fit are used to identify the indices (m, n) of higher mechanical modes observed for the device, providing further device characterization. Such 2D NEMS could offer a way to study diverse electronic phenomena such as superconductivity in twisted bilayer graphene (tBLG) heterostructures.","PeriodicalId":9375,"journal":{"name":"Bulletin of the American Physical Society","volume":"105 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79229357","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 : 2020-03-02DOI: 10.1021/jacs.8b08893.s001
Hao Dong
{"title":"Principles governing catalytic activity of self-assembled short peptides","authors":"Hao Dong","doi":"10.1021/jacs.8b08893.s001","DOIUrl":"https://doi.org/10.1021/jacs.8b08893.s001","url":null,"abstract":"","PeriodicalId":9375,"journal":{"name":"Bulletin of the American Physical Society","volume":"75 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141225421","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 : 2020-03-02DOI: 10.1103/PHYSREVB.102.104509
Abdulrhman M. Alsharari, S. Ulloa
{"title":"Superconducting pairing symmetry and spin-orbit coupling in proximitized graphene","authors":"Abdulrhman M. Alsharari, S. Ulloa","doi":"10.1103/PHYSREVB.102.104509","DOIUrl":"https://doi.org/10.1103/PHYSREVB.102.104509","url":null,"abstract":"","PeriodicalId":9375,"journal":{"name":"Bulletin of the American Physical Society","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76487789","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 : 2020-03-02DOI: 10.1103/PHYSREVB.103.014407
Yu-Hang Li, R. Cheng
Topological electronics has extended its richness to nonelectronic systems where bosonic quasiparticles can play the role of spin and heat carriers. In particular, topological magnons can be enabled by the Dzyaloshinskii-Moriya interaction (DMI) which acts as an effective spin-orbit coupling. We show that, besides DMI, an alternating arrangement of Heisenberg exchange interactions critically determines the magnon band topology, realizing a magnonic analog of the Su-Schrieffer-Heeger model. On a honeycomb ferromagnet with perpendicular anisotropy, we calculate the topological phase diagram, the chiral edge states, and the associated magnon Hall effect with tunable relative strength of exchange interactions on different links. Including weak phonon-magnon hybridization does not change the result. Candidate materials are discussed.
{"title":"Magnonic Su-Schrieffer-Heeger model in honeycomb ferromagnets","authors":"Yu-Hang Li, R. Cheng","doi":"10.1103/PHYSREVB.103.014407","DOIUrl":"https://doi.org/10.1103/PHYSREVB.103.014407","url":null,"abstract":"Topological electronics has extended its richness to nonelectronic systems where bosonic quasiparticles can play the role of spin and heat carriers. In particular, topological magnons can be enabled by the Dzyaloshinskii-Moriya interaction (DMI) which acts as an effective spin-orbit coupling. We show that, besides DMI, an alternating arrangement of Heisenberg exchange interactions critically determines the magnon band topology, realizing a magnonic analog of the Su-Schrieffer-Heeger model. On a honeycomb ferromagnet with perpendicular anisotropy, we calculate the topological phase diagram, the chiral edge states, and the associated magnon Hall effect with tunable relative strength of exchange interactions on different links. Including weak phonon-magnon hybridization does not change the result. Candidate materials are discussed.","PeriodicalId":9375,"journal":{"name":"Bulletin of the American Physical Society","volume":"181 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73039076","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 : 2020-03-02DOI: 10.1103/PHYSREVB.103.054419
L. Xiang, E. Gati, S. Bud’ko, S. Saunders, P. Canfield
We present the pressure-temperature phase diagram ${mathrm{La}}_{5}{mathrm{Co}}_{2}{mathrm{Ge}}_{3}$ up to $ensuremath{sim}5$ GPa, which was constructed from magnetization, resistivity, and specific heat measurements. At ambient pressure, ${mathrm{La}}_{5}{mathrm{Co}}_{2}{mathrm{Ge}}_{3}$ is an itinerant ferromagnet with a Curie temperature ${T}_{text{C}}ensuremath{sim}$ 4 K. Upon increasing pressure up to $ensuremath{sim}1.7$ GPa, ${T}_{text{C}}$ is suppressed down to $ensuremath{sim}3$ K. Upon further increasing pressure, our results suggest that ${mathrm{La}}_{5}{mathrm{Co}}_{2}{mathrm{Ge}}_{3}$ enters a different low-temperature ground state. The corresponding transition temperature ${T}^{*}$ has a nonmonotonic pressure dependence up to $ensuremath{sim}5$ GPa. Our results demonstrate that the ferromagnetic quantum critical point in ${mathrm{La}}_{5}{mathrm{Co}}_{2}{mathrm{Ge}}_{3}$ is avoided by the appearance of a different, likely magnetically ordered, state that has an antiferromagnetic component.
{"title":"Avoided ferromagnetic quantum critical point in pressurized \u0000La5Co2Ge3","authors":"L. Xiang, E. Gati, S. Bud’ko, S. Saunders, P. Canfield","doi":"10.1103/PHYSREVB.103.054419","DOIUrl":"https://doi.org/10.1103/PHYSREVB.103.054419","url":null,"abstract":"We present the pressure-temperature phase diagram ${mathrm{La}}_{5}{mathrm{Co}}_{2}{mathrm{Ge}}_{3}$ up to $ensuremath{sim}5$ GPa, which was constructed from magnetization, resistivity, and specific heat measurements. At ambient pressure, ${mathrm{La}}_{5}{mathrm{Co}}_{2}{mathrm{Ge}}_{3}$ is an itinerant ferromagnet with a Curie temperature ${T}_{text{C}}ensuremath{sim}$ 4 K. Upon increasing pressure up to $ensuremath{sim}1.7$ GPa, ${T}_{text{C}}$ is suppressed down to $ensuremath{sim}3$ K. Upon further increasing pressure, our results suggest that ${mathrm{La}}_{5}{mathrm{Co}}_{2}{mathrm{Ge}}_{3}$ enters a different low-temperature ground state. The corresponding transition temperature ${T}^{*}$ has a nonmonotonic pressure dependence up to $ensuremath{sim}5$ GPa. Our results demonstrate that the ferromagnetic quantum critical point in ${mathrm{La}}_{5}{mathrm{Co}}_{2}{mathrm{Ge}}_{3}$ is avoided by the appearance of a different, likely magnetically ordered, state that has an antiferromagnetic component.","PeriodicalId":9375,"journal":{"name":"Bulletin of the American Physical Society","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87509433","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 : 2020-02-01DOI: 10.1016/j.bpj.2019.11.2944
S. Htun, H. Chou, Kumar Sarthak, A. Aksimentiev
{"title":"Microscopic Model of a Biological Condensate","authors":"S. Htun, H. Chou, Kumar Sarthak, A. Aksimentiev","doi":"10.1016/j.bpj.2019.11.2944","DOIUrl":"https://doi.org/10.1016/j.bpj.2019.11.2944","url":null,"abstract":"","PeriodicalId":9375,"journal":{"name":"Bulletin of the American Physical Society","volume":"32 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72546747","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 : 2020-01-06DOI: 10.1103/physrevb.101.041103
Huaqing Huang, Yong-Shi Wu, Feng Liu
Topological crystalline insulators (TCIs) are usually described with topological protection imposed by the crystalline symmetry. In general, however, the existence of TCI states does not necessitate the periodicity of crystals as long as an essential lattice symmetry can be identified. Here we demonstrate the compatibility of TCIs with aperiodic systems, as exemplified by an octagonal quasicrystal. The aperiodic TCIs we proposed are attributed to a band inversion mechanism, which inverts states with the same parity but opposite eigenvalues of a specific symmetry (such as mirror reflection). The nontrivial topology is characterized by a nonzero integer “mirror Bott index.” Moreover, we demonstrate that the topological edge states and quantized conductance of the aperiodic TCI, which are robust against disorder, can be effectively manipulated by external electric fields. Our findings not only provide a better understanding of electronic topology in relation to symmetry but also extend the experimental realization of topological states to much broader material categories beyond crystals.
{"title":"Aperiodic topological crystalline insulators","authors":"Huaqing Huang, Yong-Shi Wu, Feng Liu","doi":"10.1103/physrevb.101.041103","DOIUrl":"https://doi.org/10.1103/physrevb.101.041103","url":null,"abstract":"Topological crystalline insulators (TCIs) are usually described with topological protection imposed by the crystalline symmetry. In general, however, the existence of TCI states does not necessitate the periodicity of crystals as long as an essential lattice symmetry can be identified. Here we demonstrate the compatibility of TCIs with aperiodic systems, as exemplified by an octagonal quasicrystal. The aperiodic TCIs we proposed are attributed to a band inversion mechanism, which inverts states with the same parity but opposite eigenvalues of a specific symmetry (such as mirror reflection). The nontrivial topology is characterized by a nonzero integer “mirror Bott index.” Moreover, we demonstrate that the topological edge states and quantized conductance of the aperiodic TCI, which are robust against disorder, can be effectively manipulated by external electric fields. Our findings not only provide a better understanding of electronic topology in relation to symmetry but also extend the experimental realization of topological states to much broader material categories beyond crystals.","PeriodicalId":9375,"journal":{"name":"Bulletin of the American Physical Society","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77119625","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 : 2019-12-20DOI: 10.1103/PHYSREVD.103.014013
T. Hou, Jun Gao, T. Hobbs, K. Xie, S. Dulat, M. Guzzi, J. Huston, P. Nadolsky, J. Pumplin, C. Schmidt, Ibrahim Sitiwaldi, D. Stump, C. Yuan
We present the new parton distribution functions (PDFs) from the CTEQ-TEA collaboration, obtained using a wide variety of high-precision Large Hadron Collider (LHC) data, in addition to the combined HERA I+II deep-inelastic scattering data set, along with the data sets present in the CT14 global QCD analysis. New LHC measurements in single-inclusive jet production with the full rapidity coverage, as well as production of Drell-Yan pairs, top-quark pairs, and high-$p_T$ $Z$ bosons, are included to achieve the greatest sensitivity to the PDFs. The parton distributions are determined at NLO and NNLO, with each of these PDFs accompanied by error sets determined using the Hessian method. Fast PDF survey techniques, based on the Hessian representation and the Lagrange Multiplier method, are used to quantify the preference of each data set to quantities such as $alpha_s(m_Z)$, and the gluon and strange quark distributions. We designate the main resulting PDF set as CT18. The ATLAS 7 TeV precision $W/Z$ data are not included in CT18, due to their tension with other data sets in the global fit. Alternate PDF sets are generated including the ATLAS precision 7 TeV $W/Z$ data (CT18A), a new scale choice for low-$x$ DIS data (CT18X), or all of the above with a slightly higher choice for the charm mass (CT18Z). Theoretical calculations of standard candle cross sections at the LHC (such as the $gg$ fusion Higgs boson cross section) are presented.
我们展示了来自CTEQ-TEA合作的新的部子分布函数(pdf)，该函数使用了各种高精度大型强子对撞机(LHC)数据，以及合并的HERA I+II深度非弹性散射数据集，以及CT14全球QCD分析中的数据集。新的大型强子对撞机测量在单包射流生产与全快速覆盖，以及生产Drell-Yan对，顶夸克对，和高-$p_T$ $Z$玻色子，包括实现对pdf的最大灵敏度。在NLO和NNLO处确定了部分子分布，每个pdf都伴随着使用Hessian方法确定的误差集。基于Hessian表示和拉格朗日乘数法的快速PDF调查技术，用于量化每个数据集对诸如$alpha_s(m_Z)$、胶子和奇夸克分布等数量的偏好。我们将生成的主要PDF集指定为CT18。ATLAS 7 TeV精度$W/Z$数据不包括在CT18中，因为它们与全球拟合中的其他数据集存在紧张关系。生成备选PDF集，包括ATLAS精度7 TeV $W/Z$数据(CT18A)，低$x$ DIS数据的新尺度选择(CT18X)，或以上所有，稍微高一点的粲质量选择(CT18Z)。给出了在大型强子对撞机上标准烛光截面的理论计算(例如$gg$聚变希格斯玻色子截面)。
{"title":"New CTEQ global analysis of quantum chromodynamics with high-precision data from the LHC","authors":"T. Hou, Jun Gao, T. Hobbs, K. Xie, S. Dulat, M. Guzzi, J. Huston, P. Nadolsky, J. Pumplin, C. Schmidt, Ibrahim Sitiwaldi, D. Stump, C. Yuan","doi":"10.1103/PHYSREVD.103.014013","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.014013","url":null,"abstract":"We present the new parton distribution functions (PDFs) from the CTEQ-TEA collaboration, obtained using a wide variety of high-precision Large Hadron Collider (LHC) data, in addition to the combined HERA I+II deep-inelastic scattering data set, along with the data sets present in the CT14 global QCD analysis. New LHC measurements in single-inclusive jet production with the full rapidity coverage, as well as production of Drell-Yan pairs, top-quark pairs, and high-$p_T$ $Z$ bosons, are included to achieve the greatest sensitivity to the PDFs. The parton distributions are determined at NLO and NNLO, with each of these PDFs accompanied by error sets determined using the Hessian method. Fast PDF survey techniques, based on the Hessian representation and the Lagrange Multiplier method, are used to quantify the preference of each data set to quantities such as $alpha_s(m_Z)$, and the gluon and strange quark distributions. We designate the main resulting PDF set as CT18. The ATLAS 7 TeV precision $W/Z$ data are not included in CT18, due to their tension with other data sets in the global fit. Alternate PDF sets are generated including the ATLAS precision 7 TeV $W/Z$ data (CT18A), a new scale choice for low-$x$ DIS data (CT18X), or all of the above with a slightly higher choice for the charm mass (CT18Z). Theoretical calculations of standard candle cross sections at the LHC (such as the $gg$ fusion Higgs boson cross section) are presented.","PeriodicalId":9375,"journal":{"name":"Bulletin of the American Physical Society","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75943022","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}
{"title":"The Development and Application of a Computational Method for Modeling Cellular-Scale Blood Flow in Complex Geometry.","authors":"P. Balogh","doi":"10.7282/T3H70KF1","DOIUrl":"https://doi.org/10.7282/T3H70KF1","url":null,"abstract":"","PeriodicalId":9375,"journal":{"name":"Bulletin of the American Physical Society","volume":"118 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81347205","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 : 2019-11-25DOI: 10.1103/PHYSREVFLUIDS.6.044606
Kerry S. Klemmer, M. Mueller
{"title":"Implied models approach for turbulence model form physics-based uncertainty quantification","authors":"Kerry S. Klemmer, M. Mueller","doi":"10.1103/PHYSREVFLUIDS.6.044606","DOIUrl":"https://doi.org/10.1103/PHYSREVFLUIDS.6.044606","url":null,"abstract":"","PeriodicalId":9375,"journal":{"name":"Bulletin of the American Physical Society","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73512715","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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