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arXiv · 2603.06796

Enhancing superconductivity using thermal bosons

Ekaterina Vlasiuk·Manfred Salmhofer·Eugene Demler·Richard Schmidt
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Abstract

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 renormalization group approach that allows us to describe the competition between density fluctuations and the build-up of boson-induced attraction between fermions. Capturing the mutual influence of bosonic and fermionic sectors, the self-consistent renormalization group framework predicts a robust increase of the critical temperature across a wide range of interactions. We find a nontrivial dependence of the critical temperature on the boson mass and we establish a phase diagram for enhanced superconductivity driven by bosons being either in the condensed or thermal state. We outline possible experimental realizations in cold atomic systems and discuss implementations using electron-exciton mixtures in van der Waals material heterostructures.

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Ekaterina Vlasiuk, Manfred Salmhofer, Eugene Demler, Richard Schmidt. 2026-03-06. Enhancing superconductivity using thermal bosons. https://arxiv.org/abs/2603.06796

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