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TT: Fachverband Tiefe Temperaturen
TT 54: Correlated Electrons: Charge Order
TT 54.8: Talk
Friday, March 21, 2025, 11:30–11:45, H33
Non-Thermal Cavity Control of Order in Electronic Systems — •Md Mursalin Islam1, Michele Pini2,1, Rafael Flores-Calderón1, and Francesco Piazza2,1 — 1Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — 2University of Augsburg, Augsburg, Germany
Cavity quantum materials have emerged as a platform to study non-thermal many-body physics with applications to the control of collective electron behavior. In an electronic system coupled to cavity photons, the superconducting gap has been predicted previously to be enhanced, due to a ‘Eliashberg effect’ taking place due to electromagnetic fluctuations as instead of a coherent laser source [1,2]. We extend this idea for the case of charge-density-wave order and systematically derive a generalized gap equation for the non-thermal situation using field theoretical methods. This allows us to compare the modified gap equations for superconductors and charge density waves: we find that while the two equations are exactly equivalent in thermal equilibrium, they assume different forms in non-thermal settings. Our formalism also allows us to systematically investigate the role of disorder in the non-thermal enhancement of the gap in both the cases.
[1] G. M. Eliashberg, JETP Lett. 11, 114 (1970);
[2] J. B. Curtis et. al., PRL 122, 167002 (2019).