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arXiv · 2310.10726

Superconductivity induced by strong electron-exciton coupling in doped atomically thin semiconductor heterostructures

Jonas von Milczewski·Xin Chen·Atac Imamoglu·Richard Schmidt
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Abstract

We study a mechanism to induce superconductivity in atomically thin semiconductors where excitons mediate an effective attraction between electrons. Our model includes interaction effects beyond the paradigm of phonon-mediated superconductivity and connects to the well-established limits of Bose and Fermi polarons. By accounting for the strong-coupling physics of trions, we find that the effective electron-exciton interaction develops a strong frequency and momentum dependence accompanied by the system undergoing an emerging BCS-BEC crossover from weakly bound $s$-wave Cooper pairs to a superfluid of bipolarons. Even at strong-coupling the bipolarons remain relatively light, resulting in critical temperatures of up to 10\% of the Fermi temperature. This renders heterostructures of two-dimensional materials a promising candidate to realize superconductivity at high critical temperatures set by electron doping and trion binding energies.

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Jonas von Milczewski, Xin Chen, Atac Imamoglu, Richard Schmidt. 2023-10-16. Superconductivity induced by strong electron-exciton coupling in doped atomically thin semiconductor heterostructures. https://doi.org/10.1103/physrevlett.133.226903

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