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Title: Anomalous Quantum Metal in a 2D Crystalline Superconductor with Electronic Phase Nonuniformity.
Authors: Li, Linjun 
Chen, Chuan 
Watanabe, Kenji
Taniguchi, Takashi
Zheng, Yi
Xu, Zhuan
Pereira, Vitor M 
Loh, Kian Ping 
Castro Neto, Antonio H 
Keywords: 1T-TiSe2
anomalous quantum metal
charge-density waves
coexisting quantum order
electrolytic gating
superconducting to quantum metal transition
superconductivity in two-dimensional crystals
Issue Date: 17-May-2019
Citation: Li, Linjun, Chen, Chuan, Watanabe, Kenji, Taniguchi, Takashi, Zheng, Yi, Xu, Zhuan, Pereira, Vitor M, Loh, Kian Ping, Castro Neto, Antonio H (2019-05-17). Anomalous Quantum Metal in a 2D Crystalline Superconductor with Electronic Phase Nonuniformity.. Nano Lett. ScholarBank@NUS Repository.
Abstract: The details of the superconducting to quantum metal transition (SQMT) at T = 0 are an open problem that invokes great interest in the nature of this exotic and unexpected ground state (Ephron et al., 1996; Mason and Kapitulnik, 1999; Chervenak and Valles, 2000). However, the SQMT was not yet investigated in a crystalline 2D superconductor with coexisting and fluctuating quantum orders. Here, we report the observation of a SQMT in 2D ion-gel-gated 1T-TiSe2 (Li et al., 2016) driven by a magnetic field. A field-induced crossover between Bose quantum metal and vortex quantum creeping with an increasing field is observed. We discuss the interplay between superconducting and CDW fluctuations (discommensurations) and their relation to the anomalous quantum metal (AQM) phase. From our findings, gate-tunable 1T-TiSe2 emerges as a privileged platform to scrutinize, in a controlled way, the details of the SQMT, the role of coexisting fluctuating orders and, ultimately, to obtain a deeper understanding of the fate of superconductivity in strictly two-dimensional crystals near zero temperature.
Source Title: Nano Lett
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.9b01574
Appears in Collections:Staff Publications

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