The Berezinskii-Kosterlitz-Thouless Transition and Anomalous Metallic Phase in a Hybrid Josephson Junction Array

Abstract

We investigate the Berezinskii-Kosterlitz-Thouless (BKT) transition in a semiconductor-superconductor two-dimensional Josephson junction array. Tuned by an electrostatic top gate, the system exhibits separate superconducting (S), anomalous metal (M*), and insulating (I) phases, bordered by separatrices of the temperature-dependent of sheet resistance, $R_s$. We find that the gate-dependent BKT transition temperature falls to zero at the S-M* boundary, suggesting incomplete vortex-antivortex pairing in the M* phase. In the S phase, $R_s$ is roughly proportional to perpendicular magnetic field at the BKT transition, as expected, while in the M* phase $R_s$ deviates from its zero-field value as a power-law in field with exponent close to 1/2 at low temperature. An in-plane magnetic field eliminates the M* phase, leaving a small scaling exponent at the S-I boundary, which we interpret as a remnant of the incipient M* phase.

arXiv comment7 pages, 4 figures

References in corpus (29)

• Artificial flat band systems: from lattice models to experiments
• Quantum Phase Transitions and Vortex Dynamics in Superconducting Networks
• Observation of topological phenomena in a programmable lattice of 1,800 qubits
• Nature of the Quantum Metal in a Two-Dimensional Crystalline Superconductor
• Metallic ground state in an ion-gated two-dimensional superconductor
• Anomalous metals -- failed superconductors
• Topologically protected quantum bits from Josephson junction arrays
• Quantized conductance doubling and hard gap in a two-dimensional semiconductor-superconductor heterostructure
• The Elusive Bose Metal
• Quantum breakdown of superconductivity in low-dimensional materials
• Suppression of superconductivity in nanowires by bulk superconductors
• Effects of dissipation on quantum phase transitions
• Superconducting, Insulating, and Anomalous Metallic Regimes in a Gated Two-Dimensional Semiconductor-Superconductor Array
• Extreme Sensitivity of the Superconducting State in Thin Films
• True Superconductivity in a 2D "Superconducting-Insulating" System
• Hard superconducting gap in germanium
• Superconductor-Insulator Transition in a Capacitively Coupled Dissipative Environment
• Stabilizing Superconductivity in Nanowires by Coupling to Dissipative Environments
• Bosonic topological insulator intermediate state in the superconductor-insulator transition
• Anomalous quantum Griffiths singularity in ultrathin crystalline lead films
• Enhancement of Superconductivity in Disordered Films by Parallel Magnetic Field
• Vortex Glass is a Metal: Unified Theory of the Magnetic Field and Disorder-Tuned Bose Metals
• Anomalous quantum metal in a 2D crystalline superconductor with intrinsic electronic non-uniformity
• Anomalous metals: from "failed superconductor" to "failed insulator"
• Power law resistivity behavior in 2D superconductors across the magnetic-field tuned superconductor-insulator transition
• Universal behavior of the bosonic metallic ground state in a two-dimensional superconductor
• Robust anomalous metallic states and vestiges of self duality in two-dimensional granular In-InOx composites
• Magnetic-Field-Induced Superconductivity in Ultrathin Pb Films with Magnetic Impurities
• Superconducting to normal state phase boundary in arrays of ultrasmall Josephson junctions

Cited by in corpus (4)

• Voltage-tuned anomalous-metal to metal transition in hybrid Josephson junction arrays
• Berezinskii-Kosterlitz-Thouless Renormalization Group Flow at a Quantum Phase Transition
• Engineering a Josephson junction chain for the simulation of the clock model
• Microwave radiometry of a quantum-critical, hybrid Josephson array