论文标题
金属shiba晶格中的拓扑量子相变
Topological Quantum Phase Transitions in Metallic Shiba Lattices
论文作者
论文摘要
在超导体上磁杂质中重叠的Yu-Shiba-Rusinov子段状态而形成的shiba带在拓扑超导体中起着重要作用。在这里，我们从理论上说明了在磁性掺杂的$ s $ s $ - $ s $ - 波超导的表面上存在一种新型的shiba带（称为拓扑shiba金属），并在存在弱的内部磁场的情况下与Rashba旋转轨道耦合。这种拓扑间隙的shiba带从张开的shiba频段通过lifshitz相变发展，并伴随着固有的热霍尔电导的二阶量子相变。我们还发现了shiba晶格中的一种机制，可以保护内在的热厅电导的一阶量子相变。由于在北晶格晶格中的远距离跳跃，拓扑shiba金属表现出具有较大非量化值的内在热大厅电导。结果，出现了大量的二阶量子相变。
Shiba bands formed by overlapping Yu-Shiba-Rusinov subgap states in magnetic impurities on a superconductor play an important role in topological superconductors. Here, we theoretically demonstrate the existence of a new type of Shiba bands (dubbed topological Shiba metal) on a magnetically doped $s$-wave superconducting surface with Rashba spin-orbit coupling in the presence of a weak in-plane magnetic field. Such topological gapless Shiba bands develop from gapped Shiba bands through Lifshitz phase transitions accompanied by second-order quantum phase transitions for the intrinsic thermal Hall conductance. We also find a mechanism in Shiba lattices that protects the first-order quantum phase transitions for the intrinsic thermal Hall conductance. Due to the long-range hopping in Shiba lattices, the topological Shiba metal exhibits intrinsic thermal Hall conductance with large nonquantized values. As a consequence, there emerge a large number of second-order quantum phase transitions.
