• 文献标题:   Tunable superconducting effective gap in graphene-TMDC heterostructures
  • 文献类型:   Article
  • 作  者:   EBADZADEH SF, GOUDARZI H, KHEZERLOU M
  • 作者关键词:   transitionmetal dichalcogenide, spinorbit coupling, graphene, superconducting excitation
  • 出版物名称:   PHYSICA BCONDENSED MATTER
  • ISSN:   0921-4526 EI 1873-2135
  • 通讯作者地址:   Urmia Univ
  • 被引频次:   1
  • DOI:   10.1016/j.physb.2019.01.041
  • 出版年:   2019

▎ 摘  要

Growth of graphene on monolayer transition-metal dichalcogenides presents opening on band gap and giant spin-orbit coupling which paves the way to achieve a useful hybrid structure for electronics and spintronics applications. Increase of the atomic number of transition-metal results in a large SOC, where eventually a band inversion appears in graphene-WSe2. We consider superconductor induction by proximity effect to the graphene-TMDC hybrid structure. As a necessity of formalism, we introduce a proper time-reversal and particle-hole symmetry operators, under which the 8 x 8 Dirac-Bogoliubov-de Gennes low-energy effective Hamiltonian is invariant. Resulting superconducting electron-hole excitations shows that, the essential dynamical parameters lambda(A,B)(I) and lambda(R) have significant effect on superconducting excitations and, specifically, subgap energy. Dependence of the superconducting energy excitation on chemical potential is explored. The signature of spin triplet p-wave pairing symmetry in the system is found to increase the subgap superconducting energy, in comparing to s-wave symmetry.