@article {ISI:000466441100011,
title = {Cavity Quantum Eliashberg Enhancement of Superconductivity},
journal = {Phys. Rev. Lett.},
volume = {122},
number = {16},
year = {2019},
month = {APR 26},
pages = {167002},
publisher = {AMER PHYSICAL SOC},
type = {Article},
abstract = {Driving a conventional superconductor with an appropriately tuned classical electromagnetic field can lead to an enhancement of superconductivity via a redistribution of the quasiparticles into a more favorable nonequilibrium distribution-a phenomenon known as the Eliashberg effect. Here, we theoretically consider coupling a two-dimensional superconducting film to the quantized electromagnetic modes of a microwave resonator cavity. As in the classical Eliashberg case, we use a kinetic equation to study the effect of the fluctuating, dynamical electromagnetic field on the Bogoliubov quasiparticles. We find that when the photon and quasiparticle systems are out of thermal equilibrium, a redistribution of quasiparticles into a more favorable nonequilibrium steady state occurs, thereby enhancing superconductivity in the sample. We predict that by tailoring the cavity environment (e.g., the photon occupation and spectral functions), enhancement can be observed in a variety of parameter regimes, offering a large degree of tunability.},
issn = {0031-9007},
doi = {10.1103/PhysRevLett.122.167002},
author = {Curtis, Jonathan B. and Raines, Zachary M. and Allocca, Andrew A. and Hafezi, Mohammad and Galitski, Victor M.}
}
@article {ISI:000455821100001,
title = {Cavity superconductor-polaritons},
journal = {Phys. Rev. B},
volume = {99},
number = {2},
year = {2019},
month = {JAN 14},
pages = {020504},
publisher = {AMER PHYSICAL SOC},
type = {Article},
abstract = {Following the recent success of realizing exciton-polariton condensates in cavities, we examine the hybridization of cavity photons with the closest analog of excitons within a superconductor, states called Bardasis-Schrieffer modes. Although these modes do not typically couple linearly to light, one can engineer a coupling with an externally imposed supercurrent, leading to the formation of hybridized Bardasis-Schrieffer-polariton states, which we obtain both as poles of the bosonic Green{\textquoteright}s function and through the derivation of an effective Hamiltonian picture for the model. These new excitations have nontrivial overlap with both the original photon states and d-wave superconducting fluctuations. We conjecture that a phase-coherent density of these objects could produce a finite d-wave component of the superconducting order parameter-an s +/- id superconducting state.},
issn = {2469-9950},
doi = {10.1103/PhysRevB.99.020504},
author = {Allocca, Andrew A. and Raines, Zachary M. and Curtis, Jonathan B. and Galitski, Victor M.}
}