Helical superconducting edge modes from pseudo-Landau levels in graphene
Helical superconducting edge modes from pseudo-Landau levels in graphene
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DOI：
10.1103/physrevb.103.094513
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发表时间：
2020-11
影响因子：
3.7
通讯作者：
Daniel Sabsovich;M. Bockrath;K. Shtengel;E. Sela
中科院分区：
文献类型：
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作者：
Daniel Sabsovich;M. Bockrath;K. Shtengel;E. Sela
我们探讨了均匀赝磁场下石墨烯与超导体界面处的Andreev态。在零赝朗道能级附近，我们发现了一个拓扑跃迁，在此跃迁处出现了一个无隙螺旋模。只要谷间和自旋翻转散射被抑制，这种1D模式就不会受到反向散射的影响。我们讨论了一个可能的实验平台来检测这种基于超导体上的应变悬浮膜的无隙模式，其中动态应变引起电荷泵。
We explore Andreev states at the interface of graphene and a superconductor for a uniform pseudo-magnetic field. Near the zeroth-pseudo Landau level, we find a topological transition as a function of applied Zeeman field, at which a gapless helical mode appears. This 1D mode is protected from backscattering as long as intervalley- and spin-flip scattering are suppressed. We discuss a possible experimental platform to detect this gapless mode based on strained suspended membranes on a superconductor, in which dynamical strain causes charge pumping.