Leaky exciton condensates in transition metal dichalcogenide moiré bilayers
View / Open Files
Publication Date
2022Journal Title
Physical Review Research
ISSN
2643-1564
Publisher
American Physical Society (APS)
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Remez, B., & Cooper, N. (2022). Leaky exciton condensates in transition metal dichalcogenide moiré bilayers. Physical Review Research https://doi.org/10.1103/PhysRevResearch.4.L022042
Abstract
We show that the "dark condensates" that arise when excitons form a
Bose-Einstein condensate in a material with an indirect bandgap are not
completely dark to optical emission. Rather, such states are "leaky
condensates" in which optical emission is facilitated by many-body
interactions. We analyze the properties of these leaky condensates in the
context of twisted bilayers of transition metal dichalcogenides, which host
strongly interacting excitons and an indirect bandgap. We show that this
interaction-driven "leaky" emission dominates photoluminescence at low
temperatures, with distinctive qualitative features. Finally, we propose that
in these materials, unique intervalley physics can lead to crystal
symmetry-breaking excitonic ordering, with implications for optical processes.
Sponsorship
Cambridge Commonwealth, European and International Trust
Simons Foundation
Funder references
Engineering and Physical Sciences Research Council (EP/P009565/1)
Simons Foundation (511029)
Engineering and Physical Sciences Research Council (EP/P034616/1)
Identifiers
External DOI: https://doi.org/10.1103/PhysRevResearch.4.L022042
This record's URL: https://www.repository.cam.ac.uk/handle/1810/335320
Statistics
Total file downloads (since January 2020). For more information on metrics see the
IRUS guide.
Recommended or similar items
The current recommendation prototype on the Apollo Repository will be turned off on 03 February 2023. Although the pilot has been fruitful for both parties, the service provider IKVA is focusing on horizon scanning products and so the recommender service can no longer be supported. We recognise the importance of recommender services in supporting research discovery and are evaluating offerings from other service providers. If you would like to offer feedback on this decision please contact us on: support@repository.cam.ac.uk