Customizing topological phases in the twisted bilayer superconductors with even-parity pairings  

作　　者：林丛豪 黄传帅 卢仙聪 Conghao Lin;Chuanshuai Huang;Xiancong Lu(Department of Physics,Xiamen University,Xiamen 361005,China)

机构地区：[1]Department of Physics,Xiamen University,Xiamen 361005,China

出　　处：《Chinese Physics B》2023年第8期1-5,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.11974293)。

摘　　要：We investigate the topological properties of twisted bilayer superconductors with different even-parity pairings in each layer.In the presence of spin-orbit coupling,the Hamiltonian is mapped into an effective odd-parity superconductor.Based on this,we deduce the topological properties by examining the relative configuration between Fermi surface and Dirac pairing node.We show that mixed Rashba and Dresselhaus spin-orbit coupling and anisotropic hopping terms,which break the C_(4)symmetry of the Fermi surface,can induce first-order topological superconductors with non-zero bulk Chern number.This provides a versatile way to control the topological phases of bilayer superconductors by adjusting the twisted angle and chemical potential.We demonstrate our results using a typical twisted angle of 53.13°,at which the translation symmetry is restored and the Chern number and edge state are calculated using the Moir′e momentum.

关 键 词：topological superconductors bilayer superconductors twistronics spin-orbit coupling 

分 类 号：O511.3[一般工业技术—材料科学与工程]