Making chiral topological superconductors from nontopological superconductors through large angle twists

Liu，Yu Bo1; Zhou，Jing2; Zhang，Yongyou1; Chen，Wei Qiang3,4; Yang，Fan1

2023-08-01

10.1103/PhysRevB.108.064508

Physical Review B   Impact Factor & Quartile

2469-9950

2469-9969

The material realization of the intrinsic chiral topological superconductivity (TSC) is still a big challenge in modern condensed-matter physics. In this paper, we propose a general scheme to make chiral TSCs from nontopological superconductivities (SCs) through the newly developed "twistronics"technique. Suppose we have a Dn-symmetric monolayer carrying nontopological SC with pairing angular momentum L=n/2. Here we propose that by stacking two such monolayers with the largest twist angle, the interlay Josephson coupling can drive chiral TSC with the same L in the system. An argument based on the universal Ginzburg-Landau theory is provided to understand this proposal. One known example which fits our proposal is the d+id chiral TSC in the 45°-twisted bilayer cuprates. Here, we demonstrate the application of our proposal to a new example, i.e., the f+if chiral TSC obtained by twisting two properly doped honeycomb-Hubbard-model monolayers by the angle 30°. This example is related to the newly synthesized 30°-twisted bilayer graphene.

SCI

English

NI Journal Papers

Others

WOS:001097254600002

PHYSICS

2-s2.0-85169289964

Scopus

1.School of Physics,Beijing Institute of Technology,Beijing,100081,China
2.Department of Science,Chongqing University of Posts and Telecommunications,Chongqing,400065,China
3.Department of Physics,Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices,Southern University of Science and Technology,Shenzhen,518055,China

Liu，Yu Bo,Zhou，Jing,Zhang，Yongyou,et al. Making chiral topological superconductors from nontopological superconductors through large angle twists[J]. Physical Review B,2023,108(6).

Liu，Yu Bo,Zhou，Jing,Zhang，Yongyou,Chen，Wei Qiang,&Yang，Fan.(2023).Making chiral topological superconductors from nontopological superconductors through large angle twists.Physical Review B,108(6).

Liu，Yu Bo,et al."Making chiral topological superconductors from nontopological superconductors through large angle twists".Physical Review B 108.6(2023).