Journal
PHYSICS LETTERS A
Volume 384, Issue 23, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physleta.2020.126570
Keywords
Berezinskii-Kosterlitz-Thouless transition; Superconductor-insulator transition; Bose metal; Bosonic topological insulator; Josephson junction arrays; Quantum Berezinskii-Kosterlitz-Thouless transition
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Funding
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
- NSF [DMR-1809188]
- Russian Science Foundation [18-72-10056]
- RFBR [18-32-00718 mol-a]
- FAPESP
- CNPq
- AFOSR [FA9550-17-1-0132]
- National Science Foundation [DMR-1606858]
- Russian Science Foundation [18-72-10056] Funding Source: Russian Science Foundation
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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. (C) 2020 The Author(s). Published by Elsevier B.V.
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