Light-induced topological superconductivity in transition metal dichalcogenide monolayers

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2022-10-01
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Language
en
Pages
11
1-11
Series
Physical Review B, Volume 106, issue 13
Abstract
Monolayer transition metal dichalcogenides (TMDs) host deeply bound excitons interacting with itinerant electrons, and as such they represent an exciting new quantum many-body Bose-Fermi mixture. Here, we demonstrate that electrons interacting with a Bose-Einstein condensate (BEC) of exciton-polaritons can realize a two-dimensional topological px+ipy superconductor. Using strong coupling Eliashberg theory, we show that this is caused by an attractive interaction mediated by the BEC, which overcompensates the repulsive Coulomb interaction between the electrons. The hybrid light-matter nature of the BEC is crucial for achieving this, since it can be used to reduce retardation effects and increase the mediated interaction in regimes important for pairing. We finally show how the great flexibility of TMDs allows one to tune the critical temperature of the topological superconducting phase to be within experimental reach.
Description
Funding Information: We acknowledge very useful discussions with Ataç İmamoğlu. A.J. acknowledges financial support from the Jenny and Antti Wihuri Foundation. The calculations presented above were performed using computer resources within the Aalto University School of Science “Science-IT” project. This work has been supported by the Danish National Research Foundation through the Center of Excellence “CCQ” (Grant Agreement No. DNRF156). Publisher Copyright: © 2022 American Physical Society.
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Julku , A , Kinnunen , J J , Camacho-Guardian , A & Bruun , G M 2022 , ' Light-induced topological superconductivity in transition metal dichalcogenide monolayers ' , Physical Review B , vol. 106 , no. 13 , 134510 , pp. 1-11 . https://doi.org/10.1103/PhysRevB.106.134510