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Dissipation engineered directional filter for quantum ratchets 用于量子棘轮的耗散工程定向滤波器
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-10-30 DOI: 10.1103/PHYSREVRESEARCH.3.013260
Zlata Fedorova, C. Dauer, A. Sidorenko, S. Eggert, Johann Kroha, S. Linden
{"title":"Dissipation engineered directional filter for quantum ratchets","authors":"Zlata Fedorova, C. Dauer, A. Sidorenko, S. Eggert, Johann Kroha, S. Linden","doi":"10.1103/PHYSREVRESEARCH.3.013260","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.3.013260","url":null,"abstract":"We demonstrate transport rectification in a hermitian Hamiltonian quantum ratchet by a dissipative, dynamic impurity. While the bulk of the ratchet supports transport in both directions, the properly designed loss function of the local impurity acts as a direction-dependent filter for the moving states. We analyse this scheme theoretically by making use of Floquet-S-Matrix theory. In addition, we provide the direct experimental observation of one-way transmittance in periodically modulated plasmonic waveguide arrays containing a local impurity with engineered losses.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73156372","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}
引用次数: 2
Competition between fractional quantum Hall liquid and Wigner solid at small fillings: Role of layer thickness and Landau level mixing 分数量子霍尔液体和维格纳固体在小填料下的竞争:层厚和朗道能级混合的作用
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-10-29 DOI: 10.1103/PHYSREVRESEARCH.3.013181
K. Villegas Rosales, S. Singh, M. Ma, M. S. Hossain, Y. Chung, L. Pfeiffer, K. West, K. Baldwin, M. Shayegan
{"title":"Competition between fractional quantum Hall liquid and Wigner solid at small fillings: Role of layer thickness and Landau level mixing","authors":"K. Villegas Rosales, S. Singh, M. Ma, M. S. Hossain, Y. Chung, L. Pfeiffer, K. West, K. Baldwin, M. Shayegan","doi":"10.1103/PHYSREVRESEARCH.3.013181","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.3.013181","url":null,"abstract":"What is the fate of the ground state of a two-dimensional electron system (2DES) at very low Landau level filling factors ($nu$) where interaction reigns supreme? An ordered array of electrons, the so-called Wigner crystal, has long been believed to be the answer. It was in fact the search for the elusive Wigner crystal that led to the discovery of an unexpected, incompressible liquid state, namely the fractional quantum Hall state at $nu=1/3$. Understanding the competition between the liquid and solid ground states has since remained an active field of fundamental research. Here we report experimental data for a new two-dimensional system where the electrons are confined to an AlAs quantum well. The exceptionally high quality of the samples and the large electron effective mass allow us to determine the liquid-solid phase diagram for the two-dimensional electrons in a large range of filling factors near $simeq 1/3$ and $simeq 1/5$. The data and their comparison with an available theoretical phase diagram reveal the crucial role of Landau level mixing and finite electron layer thickness in determining the prevailing ground states.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78239350","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}
引用次数: 7
Non-Abelian Thouless pumping in a photonic lattice 光子晶格中的非阿贝尔索勒抽运
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-10-28 DOI: 10.1103/PhysRevA.103.063518
V. Brosco, L. Pilozzi, R. Fazio, C. Conti
{"title":"Non-Abelian Thouless pumping in a photonic lattice","authors":"V. Brosco, L. Pilozzi, R. Fazio, C. Conti","doi":"10.1103/PhysRevA.103.063518","DOIUrl":"https://doi.org/10.1103/PhysRevA.103.063518","url":null,"abstract":"Non-abelian gauge fields emerge naturally in the description of adiabatically evolving quantum systems having degenerate levels. Here we show that they also play a role in Thouless pumping in the presence of degenerate bands. To this end we consider a photonic Lieb lattice having two degenerate non-dispersive modes and we show that, when the lattice parameters are slowly modulated, the propagation of the photons bear the fingerprints of the underlying non-abelian gauge structure. The non-dispersive character of the bands enables a high degree of control on photon propagation. Our work paves the way to the generation and detection of non-abelian gauge fields in photonic and optical lattices.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76407209","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}
引用次数: 13
Collective excitations and flat-band plasmon in twisted bilayer graphene near the magic angle 在魔角附近扭曲双层石墨烯中的集体激发和平带等离子体
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-10-27 DOI: 10.1103/PHYSREVB.103.115431
Xueheng Kuang, Z. Zhan, S. Yuan
{"title":"Collective excitations and flat-band plasmon in twisted bilayer graphene near the magic angle","authors":"Xueheng Kuang, Z. Zhan, S. Yuan","doi":"10.1103/PHYSREVB.103.115431","DOIUrl":"https://doi.org/10.1103/PHYSREVB.103.115431","url":null,"abstract":"Twisted bilayer graphene with tiny rotation angles have drawn significant attention due to the observation of the unconventional superconducting and correlated insulating behaviors. In this paper, we employ a full tight-binding model to investigate collective excitations in twisted bilayer graphene near magic angle. The polarization function is obtained from the tight-binding propagation method without diagonalization of the Hamiltonian matrix. With the atomic relaxation considered in the simulation, damped and undamped interband plasmon modes are discovered near magic angle under both room temperature and superconductivity transition temperature. In particular, an undamped plasmon mode in narrow bands can be directly probed in magic angle twisted bilayer graphene at superconductivity transition temperature. The undamped plasmon mode is tunable with angles and gradually fades away with both temperature and chemical potential. In practice, the flat bands in twisted bilayer graphene can be detected by exploring the collective plasmons from the measured energy loss function.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87934804","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}
引用次数: 9
Optically controlled polariton condensate molecules 光控极化子凝聚分子
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-10-27 DOI: 10.1103/PHYSREVB.103.115309
E. Cherotchenko, H. Sigurdsson, Alexis Askitopoulos, A. Nalitov
{"title":"Optically controlled polariton condensate molecules","authors":"E. Cherotchenko, H. Sigurdsson, Alexis Askitopoulos, A. Nalitov","doi":"10.1103/PHYSREVB.103.115309","DOIUrl":"https://doi.org/10.1103/PHYSREVB.103.115309","url":null,"abstract":"A condensed matter platform for analogue simulation of complex two-dimensional molecular bonding configurations, based on optically trapped exciton-polariton condensates is proposed. The stable occupation of polariton condensates in the excited states of their optically configurable potential traps permits emulation of excited atomic orbitals. A classical mean field model describing the dissipative coupling mechanism between p-orbital condensates is derived, identifying lowest threshold condensation solutions as a function of trap parameters corresponding to bound and antibound $pi$ and $sigma$ bonding configurations, similar to those in quantum chemistry.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87454024","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}
引用次数: 8
Tunable interdot coupling in few-electron bilayer graphene double quantum dots 少电子双层石墨烯双量子点的可调谐点间耦合
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-10-27 DOI: 10.1063/5.0035300
L. Banszerus, A. Rothstein, E. Icking, S. Möller, K. Watanabe, T. Taniguchi, C. Stampfer, C. Volk
{"title":"Tunable interdot coupling in few-electron bilayer graphene double quantum dots","authors":"L. Banszerus, A. Rothstein, E. Icking, S. Möller, K. Watanabe, T. Taniguchi, C. Stampfer, C. Volk","doi":"10.1063/5.0035300","DOIUrl":"https://doi.org/10.1063/5.0035300","url":null,"abstract":"We present a highly controllable double quantum dot device based on bilayer graphene. Using a device architecture of interdigitated gate fingers, we can control the interdot tunnel coupling between 1 to 4 GHz and the mutual capacitive coupling between 0.2 and 0.6 meV, independently of the charge occupation of the quantum dots. The charging energy and hence the dot size remains nearly unchanged. The tuning range of the tunnel coupling covers the operating regime of typical silicon and GaAs spin qubit devices.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73022202","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}
引用次数: 7
Vertex dependent dynamic response of a connected Kagome artificial spin ice 连接Kagome人工自旋冰的顶点依赖动态响应
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-10-27 DOI: 10.1063/5.0035195
A. Frotanpour, J. Woods, B. Farmer, A. Kaphle, L. E. De Long
{"title":"Vertex dependent dynamic response of a connected Kagome artificial spin ice","authors":"A. Frotanpour, J. Woods, B. Farmer, A. Kaphle, L. E. De Long","doi":"10.1063/5.0035195","DOIUrl":"https://doi.org/10.1063/5.0035195","url":null,"abstract":"We present the dynamic response of a connected Kagome artificial spin ice with emphasis on the effect of the vertex magnetization configuration on the mode characteristics. We use broadband ferromagnetic resonance (FMR) spectroscopy and micromagnetic simulations to identify and characterize resonant modes. We find the mode frequencies of elongated, single-domain film segments not only depend on the orientation of their easy-axis with respect to the applied magnetic field, but also depend on the vertex magnetization configuration, which suggests control over the FMR mode can be accomplished by altering the vertex magnetization. Moreover, we study differences between the vertex center mode (VCM) and the localized domain wall (LDW) mode. We show that the LDW mode acts as a signature of the domain wall (DW) nucleation process and the DW dynamics active during segment reversal events. The results show the VCM and LDW modes can be controlled using a field protocol, which has important implications for applications in magnonic and spintronic devices.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80129437","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}
引用次数: 6
Domain wall-magnetic tunnel junction spin–orbit torque devices and circuits for in-memory computing 用于内存计算的畴壁磁隧道结自旋轨道转矩装置和电路
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-10-26 DOI: 10.1063/5.0038521
Mahshid Alamdar, Thomas Leonard, Can Cui, Bishweshwor P. Rimal, Lin Xue, Otitoaleke G. Akinola, T. Patrick Xiao, J. Friedman, C. Bennett, M. Marinella, J. Incorvia
{"title":"Domain wall-magnetic tunnel junction spin–orbit torque devices and circuits for in-memory computing","authors":"Mahshid Alamdar, Thomas Leonard, Can Cui, Bishweshwor P. Rimal, Lin Xue, Otitoaleke G. Akinola, T. Patrick Xiao, J. Friedman, C. Bennett, M. Marinella, J. Incorvia","doi":"10.1063/5.0038521","DOIUrl":"https://doi.org/10.1063/5.0038521","url":null,"abstract":"There are pressing problems with traditional computing, especially for accomplishing data-intensive and real-time tasks, that motivate the development of in-memory computing devices to both store information and perform computation. Magnetic tunnel junction (MTJ) memory elements can be used for computation by manipulating a domain wall (DW), a transition region between magnetic domains. But, these devices have suffered from challenges: spin transfer torque (STT) switching of a DW requires high current, and the multiple etch steps needed to create an MTJ pillar on top of a DW track has led to reduced tunnel magnetoresistance (TMR). These issues have limited experimental study of devices and circuits. Here, we study prototypes of three-terminal domain wall-magnetic tunnel junction (DW-MTJ) in-memory computing devices that can address data processing bottlenecks and resolve these challenges by using perpendicular magnetic anisotropy (PMA), spin-orbit torque (SOT) switching, and an optimized lithography process to produce average device tunnel magnetoresistance TMR = 164%, resistance-area product RA = 31 {Omega}-{mu}m^2, close to the RA of the unpatterned film, and lower switching current density compared to using spin transfer torque. A two-device circuit shows bit propagation between devices. Device initialization variation in switching voltage is shown to be curtailed to 7% by controlling the DW initial position, which we show corresponds to 96% accuracy in a DW-MTJ full adder simulation. These results make strides in using MTJs and DWs for in-memory and neuromorphic computing applications.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88733652","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}
引用次数: 29
Theory of domain-wall magnetoresistance in metallic antiferromagnets 金属反铁磁体畴壁磁阻理论
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-10-25 DOI: 10.1103/physrevb.102.184413
Jun Zheng, A. Brataas, M. Kläui, A. Qaiumzadeh
{"title":"Theory of domain-wall magnetoresistance in metallic antiferromagnets","authors":"Jun Zheng, A. Brataas, M. Kläui, A. Qaiumzadeh","doi":"10.1103/physrevb.102.184413","DOIUrl":"https://doi.org/10.1103/physrevb.102.184413","url":null,"abstract":"We develop a theory to compute the domain-wall magnetoresistance (DWMR) in antiferromagnetic (AFM) metals with different spin structures. In the diffusive transport regime, the DWMR can be either {it negative} or positive depending on the domain-wall orientation and spin structure. In contrast, when the transport is in the ballistic regime, the DWMR is always positive, and the magnitude depends on the width and orientation of the domain wall. Our results pave the way of using electrical measurements for probing the internal spin structure in antiferromagnetic metals.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75881657","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}
引用次数: 0
Signatures of folded branches in the scanning gate microscopy of ballistic electronic cavities 弹道电子腔扫描栅显微镜中折叠分支的特征
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-10-23 DOI: 10.21468/SCIPOSTPHYS.10.3.069
Keith R. Fratus, Camille Le Calonnec, R. Jalabert, G. Weick, D. Weinmann
{"title":"Signatures of folded branches in the scanning gate microscopy of ballistic electronic cavities","authors":"Keith R. Fratus, Camille Le Calonnec, R. Jalabert, G. Weick, D. Weinmann","doi":"10.21468/SCIPOSTPHYS.10.3.069","DOIUrl":"https://doi.org/10.21468/SCIPOSTPHYS.10.3.069","url":null,"abstract":"We demonstrate the emergence of classical features in electronic quantum transport for the scanning gate microscopy response in a cavity defined by a quantum point contact and a micron-sized circular reflector. The branches in electronic flow characteristic of a quantum point contact opening on a two-dimensional electron gas with weak disorder are folded by the reflector, yielding a complex spatial pattern. Considering the deflection of classical trajectories by the scanning gate tip allows to establish simple relationships of the scanning pattern, which are in agreement with recent experimental findings.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88566491","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}
引用次数: 4
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