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

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

6 Цитирования (Scopus)

Аннотация

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.

Язык оригиналаанглийский
Номер статьи126570
Число страниц9
ЖурналPhysics Letters, Section A: General, Atomic and Solid State Physics
Том384
Номер выпуска23
DOI
СостояниеОпубликовано - 17 авг 2020

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