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Open AccessFeature PaperArticle

Transition Metal Dichalcogenides as Strategy for High Temperature Electron-Hole Superfluidity

1
Physics Division, School of Science & Technology, Università di Camerino, 62032 Camerino (MC), Italy
2
Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium
3
Supernano Laboratory, School of Pharmacy, Università di Camerino, 62032 Camerino (MC), Italy
*
Author to whom correspondence should be addressed.
Condens. Matter 2020, 5(1), 22; https://doi.org/10.3390/condmat5010022
Received: 21 February 2020 / Revised: 19 March 2020 / Accepted: 20 March 2020 / Published: 22 March 2020
Condensation of spatially indirect excitons, with the electrons and holes confined in two separate layers, has recently been observed in two different double layer heterostructures. High transition temperatures were reported in a double Transition Metal Dichalcogenide (TMD) monolayer system. We briefly review electron-hole double layer systems that have been proposed as candidates for this interesting phenomenon. We investigate the double TMD system WSe 2 /hBN/MoSe 2 , using a mean-field approach that includes multiband effects due to the spin-orbit coupling and self-consistent screening of the electron-hole Coulomb interaction. We demonstrate that the transition temperature observed in the double TMD monolayers, which is remarkably high relative to the other systems, is the result of (i) the large electron and hole effective masses in TMDs, (ii) the large TMD band gaps, and (iii) the presence of multiple superfluid condensates in the TMD system. The net effect is that the superfluidity is strong across a wide range of densities, which leads to high transition temperatures that extend as high as T B K T = 150 K. View Full-Text
Keywords: superfluidity; exciton; electron-hole; transition-metal-dichalcogenides; multiband-superconductivity; multicomponent-superfluidity superfluidity; exciton; electron-hole; transition-metal-dichalcogenides; multiband-superconductivity; multicomponent-superfluidity
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MDPI and ACS Style

Conti, S.; Neilson, D.; Peeters, F.M.; Perali, A. Transition Metal Dichalcogenides as Strategy for High Temperature Electron-Hole Superfluidity. Condens. Matter 2020, 5, 22.

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