Theoretical analysis reveals quantum bipolaron superconductivity in perovskites, indicating higher critical temperatures from quadratic electron-phonon coupling.
When the electron-phonon coupling is quadratic in the phonon coordinates, electrons can pair to form bipolarons due to phonon zero-point fluctuations, a purely quantum effect. We study superconductivity originating from this pairing mechanism in a minimal model and reveal that, in the strong coupling regime, the critical temperature (Tc) is only mildly suppressed by the coupling strength, in stark contrast to the exponential suppression in linearly coupled systems, thus implying higher optimal Tc values. We demonstrate that large coupling constants of this flavor are achieved in known materials such as perovskites, and discuss strategies to realize such superconductivity using superlattices.Received 21 December 2023Revised 8 April 2024Accepted 1 May 2024DOI:https://doi.org/10.1103/PhysRevLett.132.226001© 2024 American Physical SocietyPhysics Subject Headings (PhySH)
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Han et al. (2024) studied this question.
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