One-dimensional topological superconductivity at the edges of twisted bilayer graphene nanoribbons

Wang, Zhen-Hua1,2,3,4; Xu, Fuming1; Li, Lin2,3,5,6; Lu, Rong7,8; Wang, Bin1,9; Chen, Wei-Qiang2,3,9

2019-09-27

10.1103/PhysRevB.100.094531

PHYSICAL REVIEW B   影响因子和分区

2469-9950

2469-9969

Twisted bilayer graphene is one of the simplest van der Waals structures, and its inhomogeneous interlayer coupling can induce rich electronic properties. In twisted bilayer graphene nanoribbons (tBLGNRs), the interlayer coupling strengths are different for two ribbon edges due to the inhomogeneous bonding, which splits the edge states into two individuals in energy. The lower-energy state, localizing at the ribbon edge with the stronger interlayer coupling, is a good candidate to generate one-dimensional (1D) topological superconductivity in the presence of Rashba spin-orbit coupling, Zeeman field, and s-wave superconductivity. Majorana zero modes (MZMs) are found to be localized at both ends of this edge. The topological invariants of the system are explored by evaluating the Berry phase for infinite-length ribbons and Majorana polarization for quasi-1D ribbons, giving the same topological phase diagram. More importantly, by adjusting interlayer dislocation and uniaxial strain of tBLGNRs across the critical values, the lower-energy edge changes and 1D topological superconductivity can "jump" from one ribbon edge to the other one. Finally, by applying a gate voltage bias between bilayers or changing the interlayer distance, a MZM can transfer along the ribbon edge. The tBLGNRs provide an alternative platform to study 1D topological superconductivity and MZMs.

SCI ; EI

英语

其他

National Natural Science Foundation of China[11904234] ; National Natural Science Foundation of China[11774238] ; National Natural Science Foundation of China[11674151] ; National Natural Science Foundation of China[11604138] ; National Natural Science Foundation of China[11874234] ; National Natural Science Foundation of China[11574220]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000488251700003

AMER PHYSICAL SOC

20194007493581

Electronic properties ; Nanoribbons ; Shear waves ; Topology ; Van der Waals forces

Nanotechnology:761 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Mechanics:931.1 ; Atomic and Molecular Physics:931.3

PHYSICS

Web of Science

1.Shenzhen Univ, Shenzhen Key Lab Adv Thin Films & Applicat, Coll Phys & Optoelect Engn, Shenzhen 518060, Peoples R China
2.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
3.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
4.Beijing Computat Sci Res Ctr, Beijing 100193, Peoples R China
5.Sichuan Normal Univ, Coll Phys & Elect Engn, Chengdu 610068, Sichuan, Peoples R China
6.Sichuan Normal Univ, Ctr Computat Sci, Chengdu 610068, Sichuan, Peoples R China
7.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
8.Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China
9.Peng Cheng Lab, Ctr Quantum Comp, Shenzhen 518055, Peoples R China

Wang, Zhen-Hua,Xu, Fuming,Li, Lin,et al. One-dimensional topological superconductivity at the edges of twisted bilayer graphene nanoribbons[J]. PHYSICAL REVIEW B,2019,100(9).

Wang, Zhen-Hua,Xu, Fuming,Li, Lin,Lu, Rong,Wang, Bin,&Chen, Wei-Qiang.(2019).One-dimensional topological superconductivity at the edges of twisted bilayer graphene nanoribbons.PHYSICAL REVIEW B,100(9).

Wang, Zhen-Hua,et al."One-dimensional topological superconductivity at the edges of twisted bilayer graphene nanoribbons".PHYSICAL REVIEW B 100.9(2019).