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Title: Pairing in a dry Fermi sea

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms11875· OSTI ID:1302900
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computer Science and Mathematics Division. Center for Nanophase Materials Sciences
  2. IBM Research, Zurich (Switzerland)
  3. Univ. of Tennessee, Knoxville, TN (United States). Joint Inst. of Computational Sciences
  4. Univ. of Virginia, Charlottesville, VA (United States). Dept. of Physics
  5. Univ. of Illinois, Chicago, IL (United States). Dept. of Physics
  6. Univ. of California, Santa Barbara, CA (United States). Dept. of Physics

In the traditional Bardeen–Cooper–Schrieffer theory of superconductivity, the amplitude for the propagation of a pair of electrons with momentum k and -k has a log singularity as the temperature decreases. This so-called Cooper instability arises from the presence of an electron Fermi sea. It means that an attractive interaction, no matter how weak, will eventually lead to a pairing instability. However, in the pseudogap regime of the cuprate superconductors, where parts of the Fermi surface are destroyed, this log singularity is suppressed, raising the question of how pairing occurs in the absence of a Fermi sea. In this paper, we report Hubbard model numerical results and the analysis of angular-resolved photoemission experiments on a cuprate superconductor. Finally, in contrast to the traditional theory, we find that in the pseudogap regime the pairing instability arises from an increase in the strength of the spin–fluctuation pairing interaction as the temperature decreases rather than the Cooper log instability.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1302900
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

References (27)

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Cited By (4)

Pairfield fluctuations of a 2D Hubbard model journal June 2019
Sustained and Cost Effective Silver Substrate for Surface Enhanced Raman Spectroscopy Based Biosensing journal July 2017
Pseudogap, van Hove singularity, maximum in entropy, and specific heat for hole-doped Mott insulators journal September 2019
Pseudogap, van Hove Singularity, Maximum in Entropy and Specific Heat for Hole-Doped Mott Insulators text January 2019

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