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Bosonic topological insulator intermediate state in the superconductor-insulator transition |
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| Institution: | 1. NiPS Laboratory, INFN and Dipartimento di Fisica e Geologia, University of Perugia, via A. Pascoli, I-06100 Perugia, Italy;2. A.V. Rzhanov Institute of Semiconductor Physics SB RAS, 13 Lavrentjev Avenue, Novosibirsk 630090, Russia;3. Novosibirsk State University, Pirogova str. 2, Novosibirsk 630090, Russia;4. Institute for Physics of Microstructures RAS, GSP-105, Nizhny Novgorod 603950, Russia;5. Department of Physics, Harvard University, Cambridge, MA 02138, USA;6. Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA;7. Universidade Estadual de Campinas-UNICAMP, Instituto de Física “Gleb Wataghin”/DFA, Rua Sergio Buarque de Holanda, 777, Brazil;8. SwissScientific Technologies SA, rue du Rhone 59, CH-1204 Geneva, Switzerland;9. Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, IL 60637, USA;10. Consortium for Advanced Science and Engineering (CASE), University of Chicago, 5801 S Ellis Ave, Chicago, IL 60637, USA |
| 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. |
| 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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