The superconducting properties of a Pb/MoTe_2/Pb heterostructure:First-principles calculations within the anisotropic Migdal–Eliashberg theory  

作　　者：Wei Xia Jie Zhang Gui-Qin Huang 夏威;张洁;黄桂芹

机构地区：[1]School of Physics and Technology, Nanjing Normal University

出　　处：《Chinese Physics B》2018年第12期98-103,共6页中国物理B（英文版）

基　　金：Project supported by the Natural Science Foundation of Jiangsu Province,China(Grant No.BK20141441)

摘　　要：The spin-polarized band structures of an ultrathinheterostructure are calculated via first-principles density functional theory.The electron–phonon interaction and the superconducting properties of the ultrathinheterostructure are studied by using the fully anisotropic Migdal–Eliashberg theory powered by Wannier–Fourier interpolation.Due to the complex Fermi surface in this low-dimensional system,the electron–phonon interaction and the superconducting gap display significant anisotropy.The temperature dependence of the superconducting gap can be fitted by solving numerically the Bardeen–Cooper–Schrieffer(BCS)gap equation with an adjustable parameter α,suggesting that phonon-mediated mechanism as its superconducting origin.Large Rashba spin-splitting and superconductivity coexist in this heterostructure,suggesting that this hybrid low-dimensional system will have some specific applications.The spin-polarized band structures of an ultrathinheterostructure are calculated via first-principles density functional theory.The electron–phonon interaction and the superconducting properties of the ultrathinheterostructure are studied by using the fully anisotropic Migdal–Eliashberg theory powered by Wannier–Fourier interpolation.Due to the complex Fermi surface in this low-dimensional system,the electron–phonon interaction and the superconducting gap display significant anisotropy.The temperature dependence of the superconducting gap can be fitted by solving numerically the Bardeen–Cooper–Schrieffer(BCS)gap equation with an adjustable parameter α,suggesting that phonon-mediated mechanism as its superconducting origin.Large Rashba spin-splitting and superconductivity coexist in this heterostructure,suggesting that this hybrid low-dimensional system will have some specific applications.

关 键 词：HETEROSTRUCTURE electron–phonon coupling Rashba spin-splitting superconductivity first-principles calculation 

分 类 号：O4[理学—物理]