Effective pairing interaction in a system with an incipient band
Abstract
The nature and mechanism of superconductivity in the extremely electron-doped FeSe-based superconductors remains an outstanding problem. In these systems, the hole-like band has moved below the Fermi energy, and various spin-fluctuation theories involving pairing between states near the electron Fermi surface and states of this incipient band have been proposed. Using a nonperturbative dynamic cluster quantum Monte Carlo calculation for a bilayer Hubbard model, we show how spin-fluctuation scattering involving intermediate virtual states of the incipient band leads to an effective pairing interaction for the electrons on the remaining Fermi surface. The key feature of this interaction is that it is retarded due to the incipient nature of the hole band and the dynamics of the spin-fluctuation interaction. This allows the pairs to avoid the instantaneous repulsive Coulomb interaction and leads to a frequency dependence of the gap which should be observable in tunneling experiments. Our work provides a different perspective for the pairing mechanism in systems with an incipient band that can be tested in future experiments.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computational Sciences and Engineering Division. Center for Nanophase Materials Sciences
- Swiss Federal Inst. of Technology in Zurich (ETH Zurich) (Switzerland). Inst. for Theoretical Physics
- Univ. of California, Santa Barbara, CA (United States). Dept. of Physics
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
- Sponsoring Org.:
- USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1542207
- Alternate Identifier(s):
- OSTI ID: 1507173
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 14; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Maier, T. A., Mishra, V., Balduzzi, G., and Scalapino, D. J. Effective pairing interaction in a system with an incipient band. United States: N. p., 2019.
Web. doi:10.1103/PhysRevB.99.140504.
Maier, T. A., Mishra, V., Balduzzi, G., & Scalapino, D. J. Effective pairing interaction in a system with an incipient band. United States. https://doi.org/10.1103/PhysRevB.99.140504
Maier, T. A., Mishra, V., Balduzzi, G., and Scalapino, D. J. Mon .
"Effective pairing interaction in a system with an incipient band". United States. https://doi.org/10.1103/PhysRevB.99.140504. https://www.osti.gov/servlets/purl/1542207.
@article{osti_1542207,
title = {Effective pairing interaction in a system with an incipient band},
author = {Maier, T. A. and Mishra, V. and Balduzzi, G. and Scalapino, D. J.},
abstractNote = {The nature and mechanism of superconductivity in the extremely electron-doped FeSe-based superconductors remains an outstanding problem. In these systems, the hole-like band has moved below the Fermi energy, and various spin-fluctuation theories involving pairing between states near the electron Fermi surface and states of this incipient band have been proposed. Using a nonperturbative dynamic cluster quantum Monte Carlo calculation for a bilayer Hubbard model, we show how spin-fluctuation scattering involving intermediate virtual states of the incipient band leads to an effective pairing interaction for the electrons on the remaining Fermi surface. The key feature of this interaction is that it is retarded due to the incipient nature of the hole band and the dynamics of the spin-fluctuation interaction. This allows the pairs to avoid the instantaneous repulsive Coulomb interaction and leads to a frequency dependence of the gap which should be observable in tunneling experiments. Our work provides a different perspective for the pairing mechanism in systems with an incipient band that can be tested in future experiments.},
doi = {10.1103/PhysRevB.99.140504},
journal = {Physical Review B},
number = 14,
volume = 99,
place = {United States},
year = {Mon Apr 15 00:00:00 EDT 2019},
month = {Mon Apr 15 00:00:00 EDT 2019}
}
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