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DY: Fachverband Dynamik und Statistische Physik
DY 30: Nonequilibrium Quantum Systems I (joint session TT/DY)
DY 30.5: Vortrag
Mittwoch, 11. März 2026, 10:30–10:45, CHE/0091
Cavity-induced Eliashberg effect: superconductivity vs charge density wave — •Md Mursalin Islam1,2, Michele Pini1,2, Rafael Flores- Calderón2, and Francesco Piazza1,2 — 1Theoretical Physics III, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — 2Max Planck Institute for the Physics of Complex Systems, Nothnitzer Straße 38, 01187 Dresden, Germany
Recent experiments have shown that non-equilibrium effects can play a key role in cavity-based control of material phases, notably in systems with charge-density-wave order. Motivated by this, we extend the theory of the Eliashberg effect, originally developed for superconducting phases, to charge-density-wave phases. Starting from a minimal electronic model where superconductivity and charge-density-wave order are equivalent at equilibrium, we introduce coupling to cavity photons, which are in turn coupled to an environment at a temperature different from the one of the electronic environment. This drives the system into a non-thermal steady state, which breaks the equivalence between superconductivity and charge-density-wave order. In the superconducting case, we recover the known behavior: a shift from continuous to discontinuous phase transitions with bistability. In contrast, the charge-density-wave case displays richer behavior: tuning the cavity frequency induces both continuous and discontinuous transitions, two distinct ordered phases, and a bistable regime ending at a critical point. These findings demonstrate that the scope of cavity-based non-thermal control of quantum materials is broader than at thermal equilibrium, and strongly depends on the targeted phases.
Keywords: Eliashberg effect; Light-matter interaction; Phase transition; Supercondunctivity; Charge density wave