论文标题
拓扑超导体中的Volkov-Pankratov国家
Volkov-Pankratov states in topological superconductors
论文作者
论文摘要
我们研究出现在1D和2D拓扑超导体边界的间隙状态。虽然无质量的主要准颗粒可以通过散装的对应关系而产生，但我们发现它们只有在界面足够光滑的情况下才会伴随着大量的Volkov-Pankratov（VP）状态。这些预测可以在S波超导体中进行测试，而Rashba自旋轨道耦合放置在磁性域壁的顶部。我们计算了VP状态的自旋分辨局部密度，围绕由磁性域壁产生的频带反演，发现它们在拓扑相边界的两侧都相对自旋。我们还证明，可以通过引入面内电场来修改VP状态的空间位置，能级间距和自旋极化。
We study the in-gap states that appear at the boundaries of both 1D and 2D topological superconductors. While the massless Majorana quasiparticles are guaranteed to arise by the bulk-edge correspondence, we find that they could be accompanied by massive Volkov-Pankratov (VP) states which are present only when the interface is sufficiently smooth. These predictions can be tested in an s-wave superconductor with Rashba spin-orbit coupling placed on top of a magnetic domain wall. We calculate the spin-resolved local density of states of the VP states about the band inversion generated by a magnetic domain wall and find that they are oppositely spin-polarized on either side of the topological phase boundary. We also demonstrate that the spatial position, energy-level spacing, and spin polarization of the VP states can be modified by the introduction of in-plane electric fields.
