A simple tight-binding approach to topological superconductivity in monolayer MoS2

doi:10.1088/1674-1056/ab6552

摘要/Abstract

摘要： Monolayer molybdenum disulfide (MoS₂) has a honeycomb crystal structure. Here, with considering the triangular sublattice of molybdenum atoms, a simple tight-binding Hamiltonian is introduced (derived) for studying the phase transition and topological superconductivity in MoS₂ under uniaxial strain. It is shown that spin-singlet p+ip wave phase is a topological superconducting phase with nonzero Chern numbers. When the chemical potential is greater (smaller) than the spin-orbit coupling (SOC) strength, the Chern number is equal to four (two) and otherwise it is equal to zero. Also, the results show that, if the superconductivity energy gap is smaller than the SOC strength and the chemical potential is greater than the SOC strength, the zero energy Majorana states exist. Finally, we show that the topological superconducting phase is preserved under uniaxial strain.

关键词: MoS₂, topological superconductivity, Chern number, band inversion

Abstract: Monolayer molybdenum disulfide (MoS₂) has a honeycomb crystal structure. Here, with considering the triangular sublattice of molybdenum atoms, a simple tight-binding Hamiltonian is introduced (derived) for studying the phase transition and topological superconductivity in MoS₂ under uniaxial strain. It is shown that spin-singlet p+ip wave phase is a topological superconducting phase with nonzero Chern numbers. When the chemical potential is greater (smaller) than the spin-orbit coupling (SOC) strength, the Chern number is equal to four (two) and otherwise it is equal to zero. Also, the results show that, if the superconductivity energy gap is smaller than the SOC strength and the chemical potential is greater than the SOC strength, the zero energy Majorana states exist. Finally, we show that the topological superconducting phase is preserved under uniaxial strain.

Key words: MoS₂, topological superconductivity, Chern number, band inversion

中图分类号: (Superconducting films and low-dimensional structures)

74.78.-w

74.20.Rp (Pairing symmetries (other than s-wave)) 74.25.Dw (Superconductivity phase diagrams) 74.70.Xa (Pnictides and chalcogenides)

H Simchi. A simple tight-binding approach to topological superconductivity in monolayer MoS₂[J]. 中国物理B, 2020, 29(2): 27401-027401.

H Simchi. A simple tight-binding approach to topological superconductivity in monolayer MoS₂[J]. Chin. Phys. B, 2020, 29(2): 27401-027401.

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A simple tight-binding approach to topological superconductivity in monolayer MoS₂

A simple tight-binding approach to topological superconductivity in monolayer MoS₂

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