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27 June 2022
  » arxiv » 1904.7076

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Disorder induced multifractal superconductivity in monolayer niobium dichalcogenides
Kun Zhao ; Haicheng Lin ; Xiao Xiao ; Wantong Huang ; Wei Yao ; Mingzhe Yan ; Ying Xing ; Qinghua Zhang ; Zi-Xiang Li ; Shintaro Hoshino ; Jian Wang ; Shuyun Zhou ; Lin Gu ; Mohammad Saeed Bahramy ; Hong Yao ; Naoto Nagaosa ; Qi-Kun Xue ; Kam Tuen Law ; Xi Chen ; Shuai-Hua Ji ;
Date 15 Apr 2019
AbstractThe interplay between disorder and superconductivity is a subtle and fascinating phenomenon in quantum many body physics. The conventional superconductors are insensitive to dilute nonmagnetic impurities, known as the Anderson’s theorem. Destruction of superconductivity and even superconductor-insulator transitions occur in the regime of strong disorder. Hence disorder-enhanced superconductivity is rare and has only been observed in some alloys or granular states. Because of the entanglement of various effects, the mechanism of enhancement is still under debate. Here we report well-controlled disorder effect in the recently discovered monolayer NbSe$_2$ superconductor. The superconducting transition temperatures of NbSe$_2$ monolayers are substantially increased by disorder. Realistic theoretical modeling shows that the unusual enhancement possibly arises from the multifractality of electron wave functions. This work provides the first experimental evidence of the multifractal superconducting state.
Source arXiv, 1904.7076
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