arXiv: Mesoscale and Nanoscale Physics最新文献

A driven fractal network: Possible route to efficient thermoelectric application 驱动分形网络:高效热电应用的可能途径

arXiv: Mesoscale and Nanoscale Physics Pub Date : 2021-09-27 DOI: 10.1038/s41598-021-96592-1DOI: 10.1038/s41598-021-96592-1 10.1038/s41598-021-96592-1

Kallol Mondal, S. Ganguly, S. Maiti

引用次数: 0

Double Electron Spin Resonance of Engineered Atomic Structures on a Surface 表面工程原子结构的双电子自旋共振

arXiv: Mesoscale and Nanoscale Physics Pub Date : 2021-08-23 DOI: 10.21203/rs.3.rs-871457/v1

S. Phark, Yi Chen, C. Wolf, H. Bui, Yu Wang, M. Haze, Jinkyung Kim, C. Lutz, A. Heinrich, Yujeong Bae

引用次数: 1

Reconfigurable Training, Vortex Writing and Spin-Wave Fingerprinting in an Artificial Spin-Vortex Ice 人工自旋冰的可重构训练、涡旋书写和自旋波指纹识别

arXiv: Mesoscale and Nanoscale Physics Pub Date : 2021-07-22 DOI: 10.21203/RS.3.RS-736619/V1

J. Gartside, K. Stenning, A. Vanstone, T. Dion, Holly H. Holder, D. Arroo, H. Kurebayashi, W. Branford

{"title":"Reconfigurable Training, Vortex Writing and Spin-Wave Fingerprinting in an Artificial Spin-Vortex Ice","authors":"J. Gartside, K. Stenning, A. Vanstone, T. Dion, Holly H. Holder, D. Arroo, H. Kurebayashi, W. Branford","doi":"10.21203/RS.3.RS-736619/V1","DOIUrl":"https://doi.org/10.21203/RS.3.RS-736619/V1","url":null,"abstract":"\u0000 Strongly-interacting artificial spin systems are moving beyond mimicking naturally-occurring materials to find roles as versatile functional platforms, from reconfigurable magnonics to designer magnetic metamaterials. Typically artificial spin systems comprise nanomagnets with a single magnetisation texture: collinear macrospins or chiral vortices. By tuning nanoarray dimensions we achieve macrospin/vortex bistability and demonstrate a four-state metamaterial spin-system ‘Artificial Spin-Vortex Ice’ (ASVI). ASVI is capable of adopting Ising-like macrospins with strong ice-like vertex interactions, in addition to weakly-coupled vortices with low stray dipolar-field. The enhanced bi-texture microstate space gives rise to emergent physical memory phenomena, with ratchet-like vortex training and history-dependent nonlinear training dynamics. We observe vortex-domain formation alongside MFM tip vortex-writing. Tip-written vortices dramatically alter local reversal and memory dynamics. Vortices and macrospins exhibit starkly-differing spin-wave spectra with analogue-style mode-amplitude control via vortex training and mode-frequency shifts of ∆f = 3.8 GHz. We leverage spin-wave ‘spectral fingerprinting’ for rapid, scaleable readout of vortex and macrospin populations over complex training-protocols with applicability for functional magnonics and physical memory.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86828126","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

Data mining, dashboards and statistics: a powerful framework for the chemical design of molecular nanomagnets 数据挖掘，仪表板和统计:分子纳米磁铁化学设计的强大框架

arXiv: Mesoscale and Nanoscale Physics Pub Date : 2021-06-01 DOI: 10.21203/RS.3.RS-490959/V1

Yan Duan, J. Coutinho, Lorena E. Rosaleny, S. Cardona, José J. Baldoví, A. Gaita-Ariño

{"title":"Data mining, dashboards and statistics: a powerful framework for the chemical design of molecular nanomagnets","authors":"Yan Duan, J. Coutinho, Lorena E. Rosaleny, S. Cardona, José J. Baldoví, A. Gaita-Ariño","doi":"10.21203/RS.3.RS-490959/V1","DOIUrl":"https://doi.org/10.21203/RS.3.RS-490959/V1","url":null,"abstract":"Two decades of intensive research in lanthanide-based molecular nanomagnets have brought the magnetic memory in molecules from liquid helium to liquid nitrogen temperature. In the pursuit of new derivatives with improved operational temperatures, several \"rational\" strategies have been proposed and applied through a fluid transfer of knowledge between theoreticians and experimentalists. These have mainly focused on the choice of the magnetic ion and the design of an adequate coordination environment, both in terms of magnetic anisotropy and molecular vibrations. However, much of the progress has been achieved by serendipity, oversimplified theories and chemical intuition. In order to draw conclusions on the chemical design key parameters that govern the physical behavior of molecular nanomagnets in terms of magnetic memory, we apply here a state-of-the-art inferential statistical analysis to a body of over a thousand published experiments. Our analysis shows that the effective barrier derived from an Arrhenius equation displays an excellent correlation with the magnetic memory, and that there are only two promising strategies between all alternatives proposed so far, namely terbium bis-phthalocyaninato sandwiches and dysprosium metallocenes. In addition, we provide an interactive dashboard for visualizing the collected data, which contains all the reported cases between 2003 and 2019. This meta-study aims to dispel widespread theoretical misconceptions and will allow researchers in the field to avoid experimental blind alleys.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80357830","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: 1

Observation of electrically tunable Feshbach resonances in twisted bilayer semiconductors 扭曲双层半导体中电可调谐费什巴赫共振的观察

arXiv: Mesoscale and Nanoscale Physics Pub Date : 2021-05-09 DOI: 10.3929/ETHZ-B-000482685

I. Schwartz, Y. Shimazaki

{"title":"Observation of electrically tunable Feshbach resonances in twisted bilayer semiconductors","authors":"I. Schwartz, Y. Shimazaki","doi":"10.3929/ETHZ-B-000482685","DOIUrl":"https://doi.org/10.3929/ETHZ-B-000482685","url":null,"abstract":"Moire superlattices in twisted transition metal dichalcogenide bilayers have emerged as a rich platform for exploring strong correlations using optical spectroscopy. Despite observation of rich Mott-Wigner physics stemming from an interplay between the periodic potential and Coulomb interactions, the absence of tunnel coupling induced hybridization of electronic states ensured a classical layer degree of freedom in these experiments. Here, we investigate a MoSe$_2$ homobilayer structure where inter-layer coherent tunnelling and layer-selective optical transitions allow for electric field controlled manipulation and measurement of the layer-pseudospin of the ground-state holes. A striking example of qualitatively new phenomena in this system is our observation of an electrically tunable 2D Feshbach resonance in exciton-hole scattering, which allows us to control the strength of interactions between excitons and holes located in different layers. Our findings enable hitherto unexplored possibilities for optical investigation of many-body physics, as well as realization of degenerate Bose-Fermi mixtures with tunable interactions, without directly exposing the itinerant fermions to light fields.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85150783","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: 1

Electro-optical properties of excitons in Cu$_2$O quantum wells: I discrete states. Cu$_2$O量子阱中激子的电光性质:I离散态。

arXiv: Mesoscale and Nanoscale Physics Pub Date : 2021-04-18 DOI: 10.1103/PhysRevB.104.075303

D. Ziemkiewicz, G. Czajkowski, Karol Karpi'nski, S. Z. -. Raczy'nska

引用次数: 0

Phonons and Quantum Criticality Revealed by Temperature Linear Resistivity in Twisted Double Bilayer Graphene 双双层石墨烯温度线性电阻率揭示声子和量子临界性

arXiv: Mesoscale and Nanoscale Physics Pub Date : 2021-04-12 DOI: 10.1103/PhysRevB.106.035107

Yanbang Chu, Le Liu, Cheng Shen, Jinpeng Tian, Jian Tang, Yanchong Zhao, Jieying Liu, Yalong Yuan, Y. Ji, Rong Yang, Kenji Watanabe, T. Taniguchi, D. Shi, Fengcheng Wu, Wei Yang, Guangyu Zhang

{"title":"Phonons and Quantum Criticality Revealed by Temperature Linear Resistivity in Twisted Double Bilayer Graphene","authors":"Yanbang Chu, Le Liu, Cheng Shen, Jinpeng Tian, Jian Tang, Yanchong Zhao, Jieying Liu, Yalong Yuan, Y. Ji, Rong Yang, Kenji Watanabe, T. Taniguchi, D. Shi, Fengcheng Wu, Wei Yang, Guangyu Zhang","doi":"10.1103/PhysRevB.106.035107","DOIUrl":"https://doi.org/10.1103/PhysRevB.106.035107","url":null,"abstract":"\u0000 Twisted double bilayer graphene (TDBG) is an electric-field-tunable moiré system, exhibiting electron correlated states and related temperature linear (T-linear) resistivity. The displacement field provides a new knob to in-situ tune the relative strength of electron interactions in TDBG, yielding not only a rich phase diagram but also the ability to investigate each phase individually. Here, we report a study of carrier density (n), displacement field (D) and twist angle (θ) dependence of T-linear resistivity in TDBG. For a large twist angle (θ > 1.5°) where correlated insulating states are absent, we observe a T-linear resistivity (order of 10Ω/K) over a wide range of carrier density and its slope decreases with increasing of n before reaching the van Hove singularity, in agreement with acoustic phonon scattering model. The slope of T-linear resistivity is non-monotonically dependent on displacement field, with a single peak structure closely connected to single-particle van Hove Singularity (vHS) in TDBG. For an optimal twist angle of ~ 1.23° in the presence of correlated states, the slope of T-linear resistivity is found maximum at the boundary of the correlated halo regime (order of 100Ω/K), resulting a ‘M’ shape displacement field dependence. The observation is beyond the phonon scattering model from single particle picture, and instead it suggests a strange metal behavior. We interpret the observation as a result of symmetry-breaking instability developed at quantum critical points where electron degeneracy changes. Our results demonstrate that TDBG is an ideal system to study the interplay between phonon and quantum criticality, and might help to map out the evolution of the order parameters for the ground states.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73428948","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

Persistent Josephson Phase-Slip Memory with Topological Protection 具有拓扑保护的持久约瑟夫森相滑存储器

arXiv: Mesoscale and Nanoscale Physics Pub Date : 2021-03-24 DOI: 10.21203/RS.3.RS-321169/V1

N. Ligato, E. Strambini, F. Paolucci, F. Giazotto

{"title":"Persistent Josephson Phase-Slip Memory with Topological Protection","authors":"N. Ligato, E. Strambini, F. Paolucci, F. Giazotto","doi":"10.21203/RS.3.RS-321169/V1","DOIUrl":"https://doi.org/10.21203/RS.3.RS-321169/V1","url":null,"abstract":"Superconducting computing promises enhanced computational power in both classical and quantum approaches. Yet, efficient schemes for scalable and fast superconducting memories are still missing. On the one hand, the large inductance required in magnetic flux-controlled Josephson memories impedes device miniaturization. On the other hand, the use of ferromagnetic order to store information often degrades superconductivity, and limits the operation speed to the magnetization switching rate of a few GHz. Here, we overcome the above limitations through a fully superconducting memory cell based on the topological transition driven by hysteretic phase slips existing in aluminum nanowire Josephson junctions. Our direct and non-destructive read-out scheme, based on local tunneling spectroscopy, ensures reduced dissipation ($lesssim 40$ fW) and estimated response time below $lesssim 30$ ps thereby yielding a maximum energy per bit consumption as low as $sim 10^{-24}$ J. In addition, the memory topological index can be directly read by robust phase measurements thus further lowering dissipation whilst maximizing the stability against magnetic noise. The memory, measured over several days, showed no evidence of information degradation up to $sim 1.1$ K, i.e., $sim 85%$ of the critical temperature of aluminum. The ease of operation combined with remarkable performance elects the Josephson phase-slip memory as an attractive storage cell to be exploited in advanced superconducting logic architectures.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75788848","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

Boundary conductance protected by topology in macroscopic bismuth crystals 宏观铋晶体中拓扑结构保护的边界电导

arXiv: Mesoscale and Nanoscale Physics Pub Date : 2021-03-12 DOI: 10.21203/RS.3.RS-556743/V1

W. Kang, Felix Spathelf, B. Fauqu'e, Y. Fuseya, Kamran Behnia

引用次数: 1

Nonlinear optical Hall effect in Weyl semimetal WTe2 Weyl半金属WTe2的非线性光学霍尔效应

arXiv: Mesoscale and Nanoscale Physics Pub Date : 2021-03-01 DOI: 10.21203/RS.3.RS-228103/V1

Y. Choi, M. Doan, Youngkuk Kim, G. Choi

{"title":"Nonlinear optical Hall effect in Weyl semimetal WTe2","authors":"Y. Choi, M. Doan, Youngkuk Kim, G. Choi","doi":"10.21203/RS.3.RS-228103/V1","DOIUrl":"https://doi.org/10.21203/RS.3.RS-228103/V1","url":null,"abstract":"\u0000 The ordinary Hall effect refers to generation of a transverse voltage upon exertion of an electric field in the presence of an out-of-plane magnetic field. While a linear Hall effect is commonly observed in systems with breaking time-reversal symmetry via an applied external magnetic field or their intrinsic magnetization1, 2, a nonlinear Hall effect can generically occur in non-magnetic systems associated with a nonvanishing Berry curvature dipole3. Here we report, observations of a nonlinear optical Hall effect in a Weyl semimetal WTe2 without an applied magnetic field at room temperature. We observe an optical Hall effect resulting in a polarization rotation of the reflected light, referred to as the nonlinear Kerr rotation. The nonlinear Kerr rotation linearly depends on the charge current and optical power, which manifests the fourth-order nonlinearity. We quantitatively determine the fourth-order susceptibility, which exhibits strong anisotropy depending on the directions of the charge current and the light polarization. Employing symmetry analysis of Berry curvature multipoles, we demonstrate that the nonlinear Kerr rotations can arise from the Berry curvature hexapole allowed by the crystalline symmetries of WTe2. There also exist marginal signals that are incompatible with the symmetries, which suggest a hidden phase associated with the nonlinear process.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79323854","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: 3