配对
凝聚态物理
超导电性
邻近效应(电子束光刻)
费米面
材料科学
拓扑绝缘体
物理
各向异性
拓扑(电路)
准粒子
量子力学
纳米技术
组合数学
电子束光刻
抵抗
数学
图层(电子)
作者
Chao-Sheng Lian,Si Chen,Wenhui Duan
出处
期刊:Nano Letters
[American Chemical Society]
日期:2020-12-30
卷期号:21 (1): 709-715
被引量:14
标识
DOI:10.1021/acs.nanolett.0c04357
摘要
Layered 2M-WS2 is recently observed to show Majorana bound states in vortices, but its superconducting pairing mechanism remains unknown, hindering the understanding of its topological superconducting nature. Using the ab initio Migdal–Eliashberg theory and electron–phonon Wannier interpolation, we demonstrate that both bulk and bilayer 2M-WS2 have a single anisotropic full-gap superconducting order of s-wave symmetry. We successfully reproduce the experimental superconducting critical temperature for the bulk and predict the bilayer 2M-WS2, a two-dimensional (2D) Z2 topological metal with nontrivial edge states right at the Fermi energy, to superconduct at 7 K, much higher than that in most 2D transition metal dichalcogenides (TMDs). A distinct proximity-enhanced surface superconductivity is further revealed by simulating quasiparticle density of states. This work unveils a universal electron–phonon full-gap pairing in 2M group VI TMDs and suggests a strong intrinsic surface-bulk proximity effect for 2M-WS2, paving the way to engineering topological superconductivity in TMD-based nanoscale devices.
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