Abstract | Driven-dissipative physics lie at the core of quantum optics, but the full interplay between a driven quantum many-body system and its environment remains relatively unexplored in the solid-state realm. In this talk, based on the specific example of a driven superconductor, we investigate from a theoretical perspective the breakdown of the Lindblad formalism due to the invalidity of rotating-wave approximation. Within this regime, we show how a drive which anti-commutes with the superconducting gap operator generically induces an unusual “Floquet Fermi sea” structure, i.e., a particle-hole structure in the spectral functions from the perspective of the thermal bath. Concomitant with a driving frequency near resonant with the intrinsic cutoff frequency of the underlying interaction, this spectral structure can be harnessed to enhance the superconducting transition temperature. Our work enlightens further studies for driven-dissipative engineering of exotic phases of matter in solid-state systems. Reference: R. Lin, A. Ramires, R. Chitra, Phys. Rev. Lett. 133, 086001 (2024) |
