Bosonic topological insulator intermediate state in the superconductor-insulator transition

M. C. Diamantini, A. Yu Mironov, S. M. Postolova, X. Liu, Z. Hao, D. M. Silevitch, Ya Kopelevich, P. Kim, C. A. Trugenberger, V. M. Vinokur

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

A low-temperature intervening metallic regime arising in the two-dimensional superconductor-insulator transition challenges our understanding of electronic fluids. Here we develop a gauge theory revealing that this emergent anomalous metal is a bosonic topological insulator where bulk transport is suppressed by mutual statistics interactions between out-of-condensate Cooper pairs and vortices and the longitudinal conductivity is mediated by symmetry-protected gapless edge modes. We explore the magnetic-field-driven superconductor-insulator transition in a niobium titanium nitride device and find marked signatures of a bosonic topological insulator behavior of the intervening regime with the saturating resistance. The observed superconductor-anomalous metal and insulator-anomalous metal dual phase transitions exhibit quantum Berezinskii-Kosterlitz-Thouless criticality in accord with the gauge theory.

Original languageEnglish
Article number126570
Number of pages9
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Volume384
Issue number23
DOIs
Publication statusPublished - 17 Aug 2020

Keywords

  • Berezinskii-Kosterlitz-Thouless transition
  • Bose metal
  • Bosonic topological insulator
  • Josephson junction arrays
  • Quantum Berezinskii-Kosterlitz-Thouless transition
  • Superconductor-insulator transition
  • SUPERINSULATOR
  • PHASE-TRANSITIONS
  • METAL
  • ATOMIC LAYER DEPOSITION
  • CHARGE
  • ONSET

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