Topological Lifshitz transition and novel edge states induced by non-Abelian SU(2) gauge field on bilayer honeycomb lattice

被引：0

作者：

Guo, Wen-Xiang ^{[1
,2
]}

Liu, Wu-Ming ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100190, Peoples R China

[3] Songshan Lake Mat Lab, Dongguan 523808, Peoples R China

来源：

CHINESE PHYSICS B | 2022年 / 31卷 / 05期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

topological Lifshitz transition; SU(2) gauge field; bilayer honeycomb lattice; GRAPHENE; FERMIONS;

D O I：

10.1088/1674-1056/ac3ecb

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the SU(2) gauge effects on bilayer honeycomb lattice thoroughly. We discover a topological Lifshitz transition induced by the non-Abelian gauge potential. Topological Lifshitz transitions are determined by topologies of Fermi surfaces in the momentum space. Fermi surface consists of N = 8 Dirac points at pi-flux point instead of N = 4 in the trivial Abelian regimes. A local winding number is defined to classify the universality class of the gapless excitations. We also obtain the phase diagram of gauge fluxes by solving the secular equation. Furthermore, the novel edge states of biased bilayer nanoribbon with gauge fluxes are also investigated.

引用

页数：8

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