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

被引：3

作者：

Lin, Conghao ^{[1
]}

Huang, Chuanshuai ^{[1
]}

Lu, Xiancong ^{[1
]}

机构：

[1] Xiamen Univ, Dept Phys, Xiamen 361005, Peoples R China

来源：

CHINESE PHYSICS B | 2023年 / 32卷 / 08期

基金：

中国国家自然科学基金;

关键词：

topological superconductors; bilayer superconductors; twistronics; spin-orbit coupling;

D O I：

10.1088/1674-1056/acd3e3

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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 degrees, at which the translation symmetry is restored and the Chern number and edge state are calculated using the Moire momentum.

引用

页数：5