Anomalous quantum metal in a 2D crystalline superconductor with intrinsic electronic non-uniformity

Abstract

The details of the superconducting to quantum metal transition (SQMT) at T=0 are an open problem that invokes much interest in the nature of this exotic and unexpected ground state1-3. 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-TiSe24, driven by magnetic field. A field-induced crossover between Bose quantum metal and vortex quantum creeping with 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, obtain a deeper understanding of the fate of superconductivity in strictly two-dimensional crystals near zero temperature.

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Cited by in corpus (18)

• Coexistence of resistance oscillations and the anomalous metal phase in a lithium intercalated TiSe${}_2$ superconductor
• Extrinsic and Intrinsic Anomalous Metallic States in Transition Metal Dichalcogenide Ising Superconductors
• Quantum phase transitions in two-dimensional superconductors: a review on recent experimental progress
• Universal behavior of the bosonic metallic ground state in a two-dimensional superconductor
• Superconductivity induced by gate-driven hydrogen intercalation in the charge-density-wave compound 1T-TiSe2
• High-Temperature Anomalous Metal States in Iron-Based Interface Superconductors
• Electron correlations rule the phonon-driven instability in single layer TiSe${}_2$
• Protected superconductivity at the boundaries of charge-density-wave domains
• Theoretical explanation of electric field-induced superconductive critical temperature shifts in Indium thin films
• Unveiling resilient superconducting fluctuations in atomically thin NbSe${}_2$ through Higgs mode spectroscopy
• The Berezinskii-Kosterlitz-Thouless Transition and Anomalous Metallic Phase in a Hybrid Josephson Junction Array
• Disorder and magnetic field induced Bose-metal state in two-dimensional Ta${}_x$(SiO${}_2$)${}_{1-x}$ granular films
• Voltage-tuned anomalous-metal to metal transition in hybrid Josephson junction arrays
• Novel Emergent Phases in a Two-Dimensional Superconductor
• Transient vortex dynamics and evolution of Bose metal from a 2D superconductor on MoS${}_2$
• Superconducting gap and its Little-Parks like oscillations with high-order harmonics in lithium intercalated 1T-TiSe${}_2$
• Direct evidence for two-gap superconductivity in hydrogen-intercalated titanium diselenide
• Electrically controlled quantum transition to an anomalous metal in 2D