Cavity-enhanced superconductivity in MgB2 from first-principles quantum electrodynamics (QEDFT)

• 成果类型: Article
• 署名作者: Lu, I-Te; Shin, Dongbin; Svendsen, Mark Kamper; Hubener, Hannes; De Giovannini, Umberto; Latini, Simone; Ruggenthaler, Michael; Rubio, Angel
• 署名单位: Max Planck Society; Gwangju Institute of Science & Technology (GIST); University of Copenhagen; Niels Bohr Institute; University of Palermo; Technical University of Denmark; Simons Foundation; Flatiron Institute
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-11308
• DOI: 10.1073/pnas.2415061121
• 发表日期: 2024-12-10
• 关键词: transition; electrons; hall; weak

摘要

Strong laser pulses can control superconductivity, inducing nonequilibrium 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 MgB2 under different cavity setups and find that in the strong light- matter coupling regime its superconducting transition temperature Tc can be enhanced at most by approximate to 10% in an in-plane (or out-of-plane) polarized and realistic cavity via photon vacuum fluctuations. The results highlight that strong light-matter coupling in extended systems can profoundly alter material properties in a nonperturbative 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 materials engineering.