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

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Milczewski,  Jonas von
Theory, Max Planck Institute of Quantum Optics, Max Planck Society;

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2310.10726v1.pdf
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Citation

Milczewski, J. v., Chen, X., Imamoglu, A., & Schmidt, R. (submitted). Superconductivity induced by strong electron-exciton coupling in doped atomically thin semiconductor heterostructures.


Cite as: https://hdl.handle.net/21.11116/0000-000E-483C-F
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.