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

作　　者：H Simchi 

机构地区：[1]Department of Physics,Iran University of Science and Technology,Narmak,Tehran 16844,Iran [2]Iran Semicondutor Technology Center,Tehran 19575-199,Iran

出　　处：《Chinese Physics B》2020年第2期425-431,共7页中国物理B（英文版）

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.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 

分 类 号：O469[理学—凝聚态物理] O511[理学—电子物理学]