"Quantum bipolaron" superconductivity from quadratic electron-phonon coupling

Abstract

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 ($T_c$) is only mildly suppressed by the coupling strength, in stark contrast to the exponential suppression in linearly coupled systems, thus implying higher optimal $T_c$ 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.

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Cited by in corpus (8)

• Correlated vibration-solvent and Duschinsky effects on electron transfer dynamics and optical spectroscopy
• Mixed-state phase transitions in spin-Holstein models
• Universal Structure of Computing Moments for Exact Quantum Dynamics: Application to Arbitrary System-Bath Couplings
• Analytic method for quadratic polarons in nonparabolic bands
• Role of Matter Interactions in Superradiant Phenomena
• Polarons with arbitrary nonlinear electron-phonon interaction
• Signature of preformed pairs in angle-resolved photoemission spectroscopy
• $SU(N)$ spin-phonon simulations of Floquet dynamics in spin $S>1/2$ Mott insulators