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TT: Fachverband Tiefe Temperaturen
TT 91: Superconductivity: Theory II
TT 91.3: Vortrag
Donnerstag, 12. März 2026, 18:00–18:15, HSZ/0101
Influence of Cavity-Induced Polariton Formation on Superconductivity — •Paul Bodewei1, Paul Fadler1, and Michael A. Sentef1,2 — 1Institute for Theoretical Physics, University of Bremen/ Bremen Center for Computational Material Science — 2Max Planck Institute for the Structure and Dynamics of Matter, CFEL, Hamburg
Cavities have emerged as a powerful tool for manipulating quantum materials, leveraging vacuum fluctuations to alter fundamental material properties.
Recent experiments on the organic high-Tc κ-salts report a dramatic suppression of the superfluid density when those are coupled to a cavity [1].
The prevailing hypothesis for this suppression arises from a resonant coupling between the cavity modes and infrared-active molecular phonon modes in the κ-salt.
However, the microscopic mechanism by which such cavity-induced phonon/polariton coupling alters superconductivity remains unknown.
To gain further understanding on this, we focus on charge-transfer κ-salts with strong electronic correlations, which are well captured by a Hubbard model [2,3].
Building on that, our goal is to understand how the emergence of cavity-mediated phonon polaritons modifies the effective interactions (e.g. spin fluctuations [4] or mediated electron pairing), and thereby to examine how and why the superconducting state is suppressed.
[1] I. Keren, T.A. Webb, S. Zhang et al., arXiv:2505.17378 (2025)
[2] M. Buzzi et al., Phys. Rev. X, 10, 031028 (2020)
[3] H. Menke et al., Phys.l Rev. Lett. 133 136501 (2024)
[4] J. Schmalian, Phys. Rev. Lett., 81, 4232 (1998)
Keywords: Superconductivity; Strongly Correlated Systems; Cavity Physics