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Title: Particle-hole symmetry reveals failed superconductivity in the metallic phase of two-dimensional superconducting films

Abstract

Electrons confined to two dimensions display an unexpected diversity of behaviors as they are cooled to absolute zero. Noninteracting electrons are predicted to eventually “localize” into an insulating ground state, and it has long been supposed that electron correlations stabilize only one other phase: superconductivity. However, many two-dimensional (2D) superconducting materials have shown surprising evidence for metallic behavior, where the electrical resistivity saturates in the zero-temperature limit; the nature of this unexpected metallic state remains under intense scrutiny. We report electrical transport properties for two disordered 2D superconductors, indium oxide and tantalum nitride, and observe a magnetic field–tuned transition from a true superconductor to a metallic phase with saturated resistivity. Lastly, this metallic phase is characterized by a vanishing Hall resistivity, suggesting that it retains particle-hole symmetry from the disrupted superconducting state.

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Stanford Univ., CA (United States). Dept. of Applied Physics; Harvey Mudd College, Claremont, CA (United States). Dept. of Physics
  2. Stanford Univ., CA (United States). Dept. of Applied Physics; Stanford Univ., CA (United States). Dept. of Physics
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF)
OSTI Identifier:
1398773
Grant/Contract Number:
AC02-76SF00515; NSF-DMR-9508419
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 3; Journal Issue: 9; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Breznay, Nicholas P., and Kapitulnik, Aharon. Particle-hole symmetry reveals failed superconductivity in the metallic phase of two-dimensional superconducting films. United States: N. p., 2017. Web. doi:10.1126/sciadv.1700612.
Breznay, Nicholas P., & Kapitulnik, Aharon. Particle-hole symmetry reveals failed superconductivity in the metallic phase of two-dimensional superconducting films. United States. doi:10.1126/sciadv.1700612.
Breznay, Nicholas P., and Kapitulnik, Aharon. Fri . "Particle-hole symmetry reveals failed superconductivity in the metallic phase of two-dimensional superconducting films". United States. doi:10.1126/sciadv.1700612. https://www.osti.gov/servlets/purl/1398773.
@article{osti_1398773,
title = {Particle-hole symmetry reveals failed superconductivity in the metallic phase of two-dimensional superconducting films},
author = {Breznay, Nicholas P. and Kapitulnik, Aharon},
abstractNote = {Electrons confined to two dimensions display an unexpected diversity of behaviors as they are cooled to absolute zero. Noninteracting electrons are predicted to eventually “localize” into an insulating ground state, and it has long been supposed that electron correlations stabilize only one other phase: superconductivity. However, many two-dimensional (2D) superconducting materials have shown surprising evidence for metallic behavior, where the electrical resistivity saturates in the zero-temperature limit; the nature of this unexpected metallic state remains under intense scrutiny. We report electrical transport properties for two disordered 2D superconductors, indium oxide and tantalum nitride, and observe a magnetic field–tuned transition from a true superconductor to a metallic phase with saturated resistivity. Lastly, this metallic phase is characterized by a vanishing Hall resistivity, suggesting that it retains particle-hole symmetry from the disrupted superconducting state.},
doi = {10.1126/sciadv.1700612},
journal = {Science Advances},
number = 9,
volume = 3,
place = {United States},
year = {Fri Sep 15 00:00:00 EDT 2017},
month = {Fri Sep 15 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 3 works
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