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

• URL: http://arxiv.org/abs/2310.10726v2
• Date: Tue, 25 Jun 2024 17:34:22 GMT
• Title: Superconductivity induced by strong electron-exciton coupling in doped atomically thin semiconductor heterostructures
• Authors: Jonas von Milczewski, Xin Chen, Atac Imamoglu, Richard Schmidt,
• Abstract summary: We study a mechanism to induce superconductivity in atomically thin semiconductors. By accounting for the strong-coupling physics of trions, we find that the effective electron-exciton interaction develops a strong frequency and momentum dependence.
• Score: 2.774762581379568
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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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