Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 56: Superconductivity: Theory I
TT 56.3: Talk
Wednesday, March 11, 2026, 15:30–15:45, CHE/0089
Enhancing superconductivity using thermal bosons — •Ekaterina Vlasiuk1, Eugene Demler2, and Richard Schmidt1 — 1Institute for Theoretical Physics, Heidelberg University, Philosophenweg 16, 69120 Heidelberg, Germany — 2Institute for Theoretical Physics, ETH Zurich, 8093 Zurich, Switzerland
We investigate how the strong coupling of a superconductor to thermal bosons can enhance its superconducting critical temperature. To tackle this problem, we use a functional Renormalization Group (FRG) approach that allows us to describe the competition between the build-up of boson-induced attraction between fermions and diametral density fluctuations in the scattering channel between bosons and fermions. Thus self-consistently treating the mutual influence of bosonic and fermionic sectors allows us to uncover an increase of the critical temperature which is pronounced in the BCS limit but self-regulated as unitary fermion interactions are approached. Also, we find that the mutual influence leads to a nontrivial dependence of the critical temperature on the mass ratio between particles. We identify the regimes where our theory is applicable by investigating the phase diagram of enhanced/induced superconductivity for bosons being in either a condensed or thermal state. Moreover, we outline possible experimental realizations in cold atomic systems as well as discuss the implementation in an alternative solid-state platform - bilayer TMD materials - where excitons play the role of bosons.
Keywords: Bose-Fermi mixtures; TMD materials; Density fluctuations; Functional Renormalization Group