Heterobilayers of 2D materials as a platform for excitonic superfluidity.

ABSTRACT: Excitonic condensate has been long-sought within bulk indirect-gap semiconductors, quantum wells, and 2D material layers, all tried as carrying media. Here, we propose intrinsically stable 2D semiconductor heterostructures with doubly-indirect overlapping bands as optimal platforms for excitonic condensation. After screening hundreds of 2D materials, we identify candidates where spontaneous excitonic condensation mediated by purely electronic interaction should occur, and hetero-pairs Sb₂Te₂Se/BiTeCl, Hf₂N₂I₂/Zr₂N₂Cl₂, and LiAlTe₂/BiTeI emerge promising. Unlike monolayers, where excitonic condensation is hampered by Peierls instability, or other bilayers, where doping by applied voltage is re

SUBMITTER: Gupta S 

PROVIDER: S-EPMC7293212 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature