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Quantum Hall edge states under periodic driving: A Floquet induced chirality switch 周期驱动下的量子霍尔边缘态:Floquet诱导的手性开关
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-12-14 DOI: 10.1103/PHYSREVRESEARCH.3.013201
A. Huam'an, Luis E. F. Foa Torres, C. Balseiro, G. Usaj
{"title":"Quantum Hall edge states under periodic driving: A Floquet induced chirality switch","authors":"A. Huam'an, Luis E. F. Foa Torres, C. Balseiro, G. Usaj","doi":"10.1103/PHYSREVRESEARCH.3.013201","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.3.013201","url":null,"abstract":"We report on the fate of the quantum Hall effect in graphene under strong laser illumination. By using Floquet theory combined with both a low energy description and full tight-binding models, we clarify the selection rules, the quasienergy band structure, as well as their connection with the two-terminal and multi-terminal conductance in a device setup as relevant for experiments. We show that the well-known dynamical gaps that appear in the Floquet spectrum at $pm,hbarOmega/2$ lead to a switch-off of the quantum Hall edge transport for different edge terminations except for the armchair one, where two terms cancel out exactly. More interestingly, we show that near the Dirac point changing the laser polarization (circular right or circular left) controls the Hall conductance, by allowing to switch it on or off, or even by flipping its sign, thereby reversing the chirality of the edge states. This might lead to new avenues to fully control topologically protected transport.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90817405","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
Driven dynamics of a quantum dot electron spin coupled to a bath of higher-spin nuclei 量子点电子自旋与高自旋原子核耦合的驱动动力学
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-12-14 DOI: 10.1103/PhysRevB.103.235301
A. Vezvaee, G. Sharma, S. Economou, Edwin Barnes
{"title":"Driven dynamics of a quantum dot electron spin coupled to a bath of higher-spin nuclei","authors":"A. Vezvaee, G. Sharma, S. Economou, Edwin Barnes","doi":"10.1103/PhysRevB.103.235301","DOIUrl":"https://doi.org/10.1103/PhysRevB.103.235301","url":null,"abstract":"The interplay of optical driving and hyperfine interaction between an electron confined in a quantum dot and its surrounding nuclear spin environment produces a range of interesting physics such as mode-locking. In this work, we go beyond the ubiquitous spin 1/2 approximation for nuclear spins and present a comprehensive theoretical framework for an optically driven electron spin in a self-assembled quantum dot coupled to a nuclear spin bath of arbitrary spin. Using a dynamical mean-field approach, we compute the nuclear spin polarization distribution with and without the quadrupolar coupling. We find that while hyperfine interactions drive dynamic nuclear polarization and mode-locking, quadrupolar couplings counteract these effects. The tension between these mechanisms is imprinted on the steady-state electron spin evolution, providing a way to measure the importance of quadrupolar interactions in a quantum dot. Our results show that higher-spin effects such as quadrupolar interactions can have a significant impact on the generation of dynamic nuclear polarization and how it influences the electron spin evolution.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74412799","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
Dispersive sensing of charge states in a bilayer graphene quantum dot 双层石墨烯量子点中电荷态的色散传感
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-12-11 DOI: 10.1063/5.0040234
L. Banszerus, S. Moller, E. Icking, Corinne Steiner, Daniel Neumaier, Martin Otto, Kenji Watanabe, Takashi Taniguchi, Christian Volk, Christoph Stampfer
{"title":"Dispersive sensing of charge states in a bilayer graphene quantum dot","authors":"L. Banszerus, S. Moller, E. Icking, Corinne Steiner, Daniel Neumaier, Martin Otto, Kenji Watanabe, Takashi Taniguchi, Christian Volk, Christoph Stampfer","doi":"10.1063/5.0040234","DOIUrl":"https://doi.org/10.1063/5.0040234","url":null,"abstract":"We demonstrate dispersive readout of individual charge states in a gate-defined few-electron quantum dot in bilayer graphene. We employ a radio frequency reflectometry circuit, where an LC resonator with a resonance frequency close to 280 MHz is directly coupled to an ohmic contact of the quantum dot device. The detection scheme based on changes in the quantum capacitance operates over a wide gate-voltage range and allows to probe excited states down to the single-electron regime. Crucially, the presented sensing technique avoids the use of an additional, capacitively coupled quantum device such as a quantum point contact or single electron transistor, making dispersive sensing particularly interesting for gate-defined graphene quantum dots.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77316745","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
Interference effects induced by a precessing easy-plane magnet coupled to a helical edge state 螺旋边态耦合进动易平面磁体诱导的干涉效应
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-12-10 DOI: 10.1103/PHYSREVB.103.115142
Kevin A. Madsen, P. Brouwer, P. Recher, P. Silvestrov
{"title":"Interference effects induced by a precessing easy-plane magnet coupled to a helical edge state","authors":"Kevin A. Madsen, P. Brouwer, P. Recher, P. Silvestrov","doi":"10.1103/PHYSREVB.103.115142","DOIUrl":"https://doi.org/10.1103/PHYSREVB.103.115142","url":null,"abstract":"The interaction of a magnetic insulator with the helical electronic edge of a two-dimensional topological insulator has been shown to lead to many interesting phenomena. One of these is that for a suitable orientation of the magnetic anisotropy axis, the exchange coupling to an easy-plane magnet has no effect on DC electrical transport through a helical edge, despite the fact that it opens a gap in the spectrum of the helical edge [Meng {em et al.}, Phys. Rev. B {bf 90}, 205403 (2014)]. Here, we theoretically consider such a magnet embedded in an interferometer, consisting of a pair of helical edge states connected by two tunneling contacts, at which electrons can tunnel between the two edges. Using a scattering matrix approach, we show that the presence of the magnet in one of the interferometer arms gives rise to AC currents in response to an applied DC voltage. On the other hand, the DC Aharonov-Bohm effect is absent at zero temperature and small DC voltages, and only appears if the applied voltage or the temperature exceeds the magnet-induced excitation gap.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73993422","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
Magnetic field resilient high kinetic inductance superconducting niobium nitride coplanar waveguide resonators 磁场弹性高动感超导氮化铌共面波导谐振器
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-12-08 DOI: 10.1063/5.0039945
C. X. Yu, S. Zihlmann, Gonzalo Troncoso Fernández-Bada, J. Thomassin, F. Gustavo, É. Dumur, R. Maurand
{"title":"Magnetic field resilient high kinetic inductance superconducting niobium nitride coplanar waveguide resonators","authors":"C. X. Yu, S. Zihlmann, Gonzalo Troncoso Fernández-Bada, J. Thomassin, F. Gustavo, É. Dumur, R. Maurand","doi":"10.1063/5.0039945","DOIUrl":"https://doi.org/10.1063/5.0039945","url":null,"abstract":"We characterize niobium nitride $lambda/2$ coplanar waveguide resonators, which were fabricated from a 10nm thick film on silicon dioxide grown by sputter deposition. For films grown at 120°C we report a superconducting critical temperature of 7.4K associated with a normal square resistance of 1k$Omega$ leading to a kinetic inductance of 192pH/$Box$. We fabricated resonators with a characteristic impedance up to 4.1k$Omega$ and internal quality factors $Q_mathrm{i} > 10^4$ in the single photon regime at zero magnetic field. Moreover, in the many photons regime, the resonators present high magnetic field resilience with $Q_mathrm{i} > 10^4$ in a 6T in-plane magnetic field as well as in a 300mT out-of-plane magnetic field. These findings make such resonators a compelling choice for cQED experiments involving quantum systems with small electric dipole moments operated in finite magnetic fields.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76078989","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: 20
Superballistic electron flow through a point contact in a Ga[Al]As heterostructure Ga[Al]As异质结构中点接触的超弹道电子流
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-12-07 DOI: 10.1103/PhysRevResearch.3.023033
L. Ginzburg, Carolin Gold, M. Röösli, C. Reichl, M. Berl, W. Wegscheider, T. Ihn, K. Ensslin
{"title":"Superballistic electron flow through a point contact in a Ga[Al]As heterostructure","authors":"L. Ginzburg, Carolin Gold, M. Röösli, C. Reichl, M. Berl, W. Wegscheider, T. Ihn, K. Ensslin","doi":"10.1103/PhysRevResearch.3.023033","DOIUrl":"https://doi.org/10.1103/PhysRevResearch.3.023033","url":null,"abstract":"We measure electronic transport through point contacts in the high-mobility electron gas in a Ga[Al]As heterostructure at different temperatures and bulk electron densities. The conductance through all point contacts increases with increasing temperature in a temperature window around $T sim 10 K$ for all investigated electron densities and point contact widths. For high electron densities this conductance exceeds the fundamental ballistic limit (Sharvin limit). These observations are in agreement with a viscous electron transport model and previous experiments in graphene.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76206656","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
Electrically controlled emission from singlet and triplet exciton species in atomically thin light-emitting diodes 原子薄发光二极管中单线态和三重态激子的电控发射
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-12-07 DOI: 10.1103/PhysRevB.103.L161411
Andrew Y. Joe, L. Jauregui, Kateryna Pistunova, Andrés M. Mier Valdivia, Zhengguang Lu, D. Wild, Giovanni Scuri, K. De Greve, Ryan J. Gelly, You Zhou, J. Sung, A. Sushko, T. Taniguchi, Kenji Watanabe, D. Smirnov, M. Lukin, Hongkun Park, P. Kim
{"title":"Electrically controlled emission from singlet and triplet exciton species in atomically thin light-emitting diodes","authors":"Andrew Y. Joe, L. Jauregui, Kateryna Pistunova, Andrés M. Mier Valdivia, Zhengguang Lu, D. Wild, Giovanni Scuri, K. De Greve, Ryan J. Gelly, You Zhou, J. Sung, A. Sushko, T. Taniguchi, Kenji Watanabe, D. Smirnov, M. Lukin, Hongkun Park, P. Kim","doi":"10.1103/PhysRevB.103.L161411","DOIUrl":"https://doi.org/10.1103/PhysRevB.103.L161411","url":null,"abstract":"Excitons are composite bosons that can feature spin singlet and triplet states. In usual semiconductors, without an additional spin-flip mechanism, triplet excitons are extremely inefficient optical emitters. Transition metal dichalcogenides (TMDs), with their large spin-orbit coupling, have been of special interest for valleytronic applications for their coupling of circularly polarized light to excitons with selective valley and spin$^{1-4}$. In atomically thin MoSe$_2$/WSe$_2$ TMD van der Waals (vdW) heterostructures, the unique atomic registry of vdW layers provides a quasi-angular momentum to interlayer excitons$^{5,6}$, enabling emission from otherwise dark spin triplet excitons. Here, we report electrically tunable spin singlet and triplet exciton emission from atomically aligned TMD heterostructures. We confirm the spin configurations of the light-emitting excitons employing magnetic fields to measure effective exciton g-factors. The interlayer tunneling current across the TMD vdW heterostructure enables the electrical generation of singlet and triplet exciton emission in this atomically thin PN junction. We demonstrate electrically tunability between the singlet and triplet excitons that are generated by charge injection. Atomically thin TMD heterostructure light emitting diodes thus enables a route for optoelectronic devices that can configure spin and valley quantum states independently by controlling the atomic stacking registry.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84568512","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: 20
Electric current noise in mesoscopic organic semiconductors induced by nuclear spin fluctuations 介观有机半导体中由核自旋涨落引起的电流噪声
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-12-07 DOI: 10.1103/PhysRevB.103.195440
D. Smirnov, A. Shumilin
{"title":"Electric current noise in mesoscopic organic semiconductors induced by nuclear spin fluctuations","authors":"D. Smirnov, A. Shumilin","doi":"10.1103/PhysRevB.103.195440","DOIUrl":"https://doi.org/10.1103/PhysRevB.103.195440","url":null,"abstract":"We demonstrate that nuclear spin fluctuations lead to the electric current noise in the mesoscopic samples of organic semiconductors showing the pronounced magnetoresistance in weak fields. For the bipolaron and electron-hole mechanisms of organic magnetoresistance, the current noise spectrum consists of the high frequency peak related to the nuclear spin precession in the Knight field of the charge carriers and the low frequency peak related to the nuclear spin relaxation. The shape of the spectrum depends on the external magnetic and radiofrequency fields, which allows one to prove the role of nuclei in magnetoresistance experimentally.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91362440","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
Dynamical leakage of Majorana mode into side-attached quantum dot 马约拉纳模侧向附着量子点的动态泄漏
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-12-05 DOI: 10.1103/PhysRevB.103.235416
J. Barański, M. Barańska, T. Zienkiewicz, R. Taranko, T. Domański
{"title":"Dynamical leakage of Majorana mode into side-attached quantum dot","authors":"J. Barański, M. Barańska, T. Zienkiewicz, R. Taranko, T. Domański","doi":"10.1103/PhysRevB.103.235416","DOIUrl":"https://doi.org/10.1103/PhysRevB.103.235416","url":null,"abstract":"We study a hybrid structure, comprising the single-level quantum dot attached to the topological superconducting nanowire, inspecting dynamical transfer of the Majorana quasiparticle onto normal region. Motivated by the recent experimental realization of such heterostructure and its investigation under the stationary conditions [L. Schneider et al., https://doi.org/10.1038/s41467-020-18540-3, Nature Communications 11, 4707 (2020)] where the quantum dot energy level can be tuned by gate potential we examine how much time is needed for the Majorana mode to leak into the normal region. We estimate, that for typical hybrid structures this dynamical process would take about 20 nanoseconds. We propose a feasible empirical protocol for its detection by means of the time-resolved Andreev tunneling spectroscopy.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82951868","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
Theory of magnetism in the van der Waals magnet CrI3. 范德华磁体CrI3的磁性理论。
arXiv: Mesoscale and Nanoscale Physics Pub Date : 2020-12-05 DOI: 10.1103/PhysRevB.103.174410
R. Jaeschke-Ubiergo, E. S. Morell, A. S. Nunez
{"title":"Theory of magnetism in the van der Waals magnet CrI3.","authors":"R. Jaeschke-Ubiergo, E. S. Morell, A. S. Nunez","doi":"10.1103/PhysRevB.103.174410","DOIUrl":"https://doi.org/10.1103/PhysRevB.103.174410","url":null,"abstract":"We study the microscopical origin of anisotropic ferromagnetism in the van der Waals magnet CrI3. We conclude that the nearest neighbors exchange is well described by the Heisenberg-Kitaev-Gamma (HKGamma) model, and we also found a nonzero Dzyaloshinskii-Moriya interaction (DMI) on next nearest neighbors. Both Kitaev and DMI are known to generate a non-trivial topology of the magnons in the honeycomb lattice and have been used separately to describe the low energy regime of this material. We discuss that including one or the other leads to different signs of the Chern number. Furthermore, the topological gap at K-point seems to be mainly produced by DMI, despite it is one order of magnitude smaller than Kitaev. Finally, we show that by applying an external electric field perpendicular to the crystal plane, it is possible to induce DMI on nearest neighbors, and this could have consequences in non-collinear spin textures, such as domain walls and skyrmions.","PeriodicalId":8465,"journal":{"name":"arXiv: Mesoscale and Nanoscale Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87813440","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: 14
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