Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.247001
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Stewart Blusson Quantum Matter Institute (SBQMI)
- Institute for Theoretical Atomic, Molecular, and Optical Physics (ITAMP) at Harvard University
- Smithsonian Astrophysical Observatory
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It is widely accepted that phonon-mediated high-temperature superconductivity is impossible at ambient pressure, because of the very large effective masses of polarons or bipolarons at strong electron-phonon coupling. Here we challenge this belief by showing that strongly bound yet very light bipolarons appear for strong Peierls coupling. These bipolamns also exhibit many other unconventional properties; e.g., at strong coupling there are two low-energy bipolaron bands that are stable against strong Coulomb repulsion. Using numerical simulations and analytical arguments, we show that these properties result from the specific form of the phonon-mediated interaction, which is of pair hopping instead of regular density-density type. This unusual effective interaction is bound to have nontrivial consequences for the superconducting state expected to arise at finite carrier concentrations and should favor a large critical temperature.
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