Cavity engineered phonon-mediated superconductivity in MgB_2 from first principles quantum electrodynamics
arxiv(2024)
摘要
Strong laser pulses can control superconductivity, inducing non-equilibrium
transient pairing by leveraging strong-light matter interaction. Here we
demonstrate theoretically that equilibrium ground-state phonon-mediated
superconductive pairing can be affected through the vacuum fluctuating
electromagnetic field in a cavity. Using the recently developed ab
initio quantum electrodynamical density-functional theory approximation, we
specifically investigate the phonon-mediated superconductive behavior of
MgB_2 under different cavity setups and find that in the strong-light matter
coupling regime its superconducting transition temperature can be enhanced by
≈ 73% (≈ 40%) in an in-plane (out-of-plane) polarized cavity.
The results highlight that strong-light matter coupling in extended systems can
profoundly alter material properties in a non-perturbative way by modifying
their electronic structure and phononic dispersion at the same time. Our
findings indicate a pathway to the experimental realization of light-controlled
superconductivity in solid-state materials at equilibrium via cavity-material
engineering.
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