Topological superconductivity with large Chern numbers in a ferromagnetic-metal–superconductor heterostructure
Yingwen Zhang, Dao-Xin Yao, Zhi Wang
DOI 10.1103/PhysRevB.108.224513 · Physical Review B
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Abstract
The ferromagnetic-metal–superconductor heterostructure with spin-orbit coupling is a promising candidate for topological superconductivity. Inspired by recent experimental progress in layered van der Waals metal–superconductor heterostructures, we study the interplay between the interface Rashba hopping and the intrinsic Dresselhaus spin-orbit coupling and demonstrate rich topological phases with five distinct Chern numbers. In particular, we find a topological state with the Chern number as large as four in a range of parameter space. We calculate the Berry curvatures that construct the Chern numbers and show that these Berry curvatures induce anomalous thermal Hall transport of the superconducting quasiparticles. We reveal chiral edge states in the topological phase and counterpropagating chiral edge states in the topologically trivial phase, and show that the wave functions of these edge states mostly concentrate on the ferromagnetic metal layer of the heterostructure.
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