Quantum Bipolaron Superconductivity from Quadratic Electron-Phonon Coupling
Zhaoyu Han, Steven A. Kivelson, Pavel A. Volkov
DOI 10.1103/PhysRevLett.132.226001 · Physical Review Letters
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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 (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.
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