The soft-mode phonons mediated unconventional superconductivity in monolayer 1T'-WTe2

Recent experiments have tuned the monolayer 1T'-WTe2 to be superconducting by electrostatic gating. Here, we theoretically study the phonon-mediated superconductivity in monolayer 1T'-WTe2 via charge doping. We reveal that the emergence of soft-mode phonons with specific momentum is crucia...

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Bibliographic Details
Published in:arXiv.org 2020-11
Main Authors: Yang, Wei, Chong-jie, Mo, Shi-Bin, Fu, Yang, Yu, Fa-Wei Zheng, Xiao-Hui, Wang, Yuan-An, Liu, Hao, Ning, Zhang, Ping
Format: Article
Language:English
Subjects:
Anisotropy
Critical field (superconductivity)
Doping
Fermi surfaces
Monolayers
Nesting
Phonons
Temperature dependence
Unconventional superconductivity
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Summary:Recent experiments have tuned the monolayer 1T'-WTe2 to be superconducting by electrostatic gating. Here, we theoretically study the phonon-mediated superconductivity in monolayer 1T'-WTe2 via charge doping. We reveal that the emergence of soft-mode phonons with specific momentum is crucial to give rise to the superconductivity in electron-doping regime, whereas no such soft-mode phonons and no superconductivity emerge in hole-doping regime. We also find a superconducting dome, which can be attributed to the change of Fermi surface nesting condition as electron doping. By taking into account the experimentally established strong anisotropy of temperature-dependent upper critical field H_{c2} between the in-plane and out-of-plane directions, we show that the superconducting state probably has the unconventional equal-spin-triplet pairing in A_{u} channel of C_{2h} point group. Our studies provide a promising understanding to the doping dependent superconductivity and strong anisotropy of H_{c2} in monolayer 1T'-WTe2.
ISSN:2331-8422
DOI:10.48550/arxiv.2005.11012