Enhancing superconductivity using thermal bosons
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.
Cite
@article{arxiv.2603.06796,
title = {Enhancing superconductivity using thermal bosons},
author = {Ekaterina Vlasiuk and Manfred Salmhofer and Eugene Demler and Richard Schmidt},
journal= {arXiv preprint arXiv:2603.06796},
year = {2026}
}
Comments
7+7 pages, 4+5 figures