Dual Universality and Unconventional Phase Diagram of a Clean 2D Superconductor with Tunable Disorders

Abstract

Weakly disordered two-dimensional (2D) superconductors can host richer quantum phase transitions than their highly-disordered counterparts. This is due to the insertion of a metallic state in the transition between a superconductor and an insulator. Disorders were predicted to show profound influences on the boundaries surrounding this intermediate metallic phase, affecting the existence of a metallic ground state called Bose metal and the dynamic processes in a quantum Griffiths state. Here we present a study on quantum phase transitions of a clean 2D superconductor, MoS2, under a perpendicular magnetic field as a function of disorder strength that is tuned electrostatically. We found two universal scaling behaviors independent of disorders: a power-law scaling applies for all metallic states, and an activated dynamical scaling characterizes transitions between quantum Griffiths state and weakly localized metal. A study over a range of disorder states in this unexplored clear regime suggests that a Bose metal ground state is expected only after reaching a critical cleanness. Whereas, stronger disorder stabilizes a true 2D superconductivity and enhances the quantum Griffiths phase.

arXiv comment21 pages, 4 figures

References in corpus (33)

• Continuous Quantum Phase Transitions
• Strongly enhanced charge-density-wave order in monolayer NbSe${}_2$
• Nature of the superconductor-insulator transition in disordered superconductors
• Nature of the Quantum Metal in a Two-Dimensional Crystalline Superconductor
• Metallic ground state in an ion-gated two-dimensional superconductor
• Ising Superconductivity and Quantum Phase Transition in Macro-Size Monolayer NbSe2
• Electronic Highways in Bilayer Graphene
• The Elusive Bose Metal
• First-principles theory of field-effect doping in transition-metal dichalcogenides: Structural properties, electronic structure, Hall coefficient, and electrical conductivity
• A full superconducting dome of strong Ising protection in gated monolayer WS2
• Transport Through Quantum Melts
• On the existence of a Bose Metal at T=0
• Disorder engineering and conductivity dome in ReS2 with electrolyte gating
• Unusual suppression of the superconducting energy gap and critical temperature in atomically thin NbSe2
• Theory of quantum metal to superconductor transitions in highly conducting systems
• Microscopic annealing process and its impact on superconductivity in T'-structure electron-doped copper oxides
• The approach to a superconductor-to-Bose-insulator transition in disordered films
• Renormalization group study of the two-dimensional random transverse-field Ising model
• Effects of dissipation on a quantum critical point with disorder
• The Bose Metal: gauge field fluctuations and scaling for field tuned quantum phase transitions
• Criticality and quenched disorder: rare regions vs. Harris criterion
• A Phase Glass is a Bose Metal: New Conducting State in 2D
• Particle-hole symmetry reveals failed superconductivity in the metallic phase of two-dimensional superconducting films
• Evidence of Collective Charge Behavior in the Insulating State of Ultrathin Films of Superconducting Metals
• Observation of Quantum Griffiths Singularity and Ferromagnetism at Superconducting LaAlO3/SrTiO3(110) Interface
• Long-range order versus random-singlet phases in quantum antiferromagnetic systems with quenched disorder
• Infinite randomness fixed point of the superconductor-metal quantum phase transition
• RKKY Interaction in Disordered Graphene
• Weakly disordered absorbing-state phase transitions
• Interaction-induced Bose Metal in 2D
• Dynamical conductivity at the dirty superconductor-metal quantum phase transition
• Infinite-randomness fixed point of the quantum superconductor-metal transitions in amorphous thin films
• The Discovery of Tunable Universality Class in Superconducting $\beta$-W Thin Films