Light, small bipolarons: A new route to high transition temperature superconductivity
ORAL · Invited
Abstract
A model for phonon-mediated high-Tc superconductivity based on superfluidity of light bipolarons is presented. I present numerically exact results obtained using a sign-problem-free quantum Monte Carlo approach for bipolaron binding energies, masses and radii for both Holstein (density-coupled) and Peierls/Su-Schrieffer-Heeger (bond-modulated) models of electron-phonon coupling, with and without both short- and long-range Coulomb interactions. The bond-modulated mechanism is shown to give rise to small-size, yet light-mass bipolarons, which condense at temperatures that generically and significantly exceed typical upper bounds on Tc of phonon-mediated superconductivity based on Migdal-Eliashberg theory.
*I acknowledge support from the Gordon and Betty Moore Foundation's EPiQS Initiative through Grant GBMF8686 at Stanford University and from the National Science Foundation (NSF) Materials Research Science and Engineering Centers (MRSEC) program through Columbia University in the Center for Precision Assembly of Superstratic and Superatomic Solids under Grant No. DMR-1420634.
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Publication: arXiv:2203.07380;
Sous et al, to be submitted (2022)
Presenters
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John Sous
- Stanford University