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Published November 22, 2011 | Published + Supplemental Material
Journal Article Open

Gapless Excitations in Strongly Fluctuating Superconducting Wires

Abstract

We study the low-temperature tunneling density of states of thin wires where superconductivity is destroyed through quantum phase-slip proliferation. Although this regime is believed to behave as an insulator, we show that for a large temperature range this phase is characterized by a conductivity falling off at most linearly with temperature, and has a gapless excitation spectrum. This novel conducting phase results from electron-electron interaction induced pair breaking. Also, it may help clarify the low-temperature metallic features found in films and wires whose bulk realization is superconducting.

Additional Information

© 2011 American Physical Society. Received 8 August 2011; published 22 November 2011. We acknowledge helpful discussions with E. A. Demler, B. I. Halperin, P. A. Lee, and T. Senthil. We thank the Packard Foundation, BSF, DIP, the Alexander von Humboldt Foundation and the Aspen Center for Physics.

Attached Files

Published - Meidan2011p16487Phys_Rev_Lett.pdf

Supplemental Material - README.TXT

Supplemental Material - self_energy1.eps

Supplemental Material - supp.pdf

Supplemental Material - supp.tex

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