论文标题
静电拓扑表面状态中的浆果相开关
Berry-phase switch in electrostatically-confined topological surface states
论文作者
论文摘要
在这里，我们可以看到7 Quintuple-Layer三维（3D）拓扑绝缘子（TI）SB2TE3外延膜的圆形N-P连接中拓扑表面状态的捕获。如空间和磁场依赖性的隧穿光谱所示，这些被困的共振显示了零磁场的退化时间反交换状态之间的场诱导分裂。这些行为通过将实验数据与数值和半古典模拟进行比较，将这些行为明确地归因于浆果相关。在外延膜中拓扑表面状态的成功静电捕获和浆果相开关的观察为利用基于Ti的量子设备的新想法提供了丰富的平台。
Here we visualize the trapping of topological surface states in the circular n-p junctions on the top surface of the 7-quintuple-layer three dimensional (3D) topological insulator (TI) Sb2Te3 epitaxial films. As shown by spatially- and field-dependent tunneling spectra, these trapped resonances show field-induced splittings between the degenerate time-reversal-symmetric states at zero magnetic field. These behaviors are attributed unambiguously to Berry-phase switch by comparing the experimental data with both numerical and semi-classical simulations. The successful electrostatic trapping of topological surface states in epitaxial films and the observation of Berry-phase switch provide a rich platform of exploiting new ideas for TI-based quantum devices.
