Dynamical Cooper pairing in nonequilibrium electron-phonon systems

Michael Knap; Mehrtash Babadi; Gil Refael; Ivar Martin; Eugene Demler

doi:10.1103/PhysRevB.94.214504

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Dynamical Cooper pairing in nonequilibrium electron-phonon systems

Michael Knap, Mehrtash Babadi, Gil Refael, Ivar Martin, Eugene Demler

DOI 10.1103/PhysRevB.94.214504 · Physical Review B

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Abstract

We analyze Cooper pairing instabilities in strongly driven electron-phonon systems. The light-induced nonequilibrium state of phonons results in a simultaneous increase of the superconducting coupling constant and the electron scattering. We demonstrate that the competition between these effects leads to an enhanced superconducting transition temperature in a broad range of parameters. Our results may explain the observed transient enhancement of superconductivity in several classes of materials upon irradiation with high intensity pulses of terahertz light, and may pave new ways for engineering high-temperature light-induced superconducting states.