Indirect excitons in van der Waals heterostructures at room temperature

Calman, E. V.; Fogler, M. M.; Butov, L. V.; Hu, S.; Mishchenko, A.; Geim, A. K.

doi:10.1038/s41467-018-04293-7

Indirect excitons in van der Waals heterostructures at room temperature

Journal Article · Mon May 14 00:00:00 EDT 2018 · Nature Communications

DOI:https://doi.org/10.1038/s41467-018-04293-7· OSTI ID:1499677

Calman, E. V. ^[1]; Fogler, M. M. ^[2]; Butov, L. V. ^[2]; Hu, S. ^[3]; ^[3]; Geim, A. K. ^[3]

Univ. of California, San Diego, La Jolla, CA (United States); University of California, San Diego
Univ. of California, San Diego, La Jolla, CA (United States)
Univ. of Manchester, Manchester (United Kingdom)

Indirect excitons (IXs) are explored both for studying quantum Bose gases in semiconductor materials and for the development of excitonic devices. IXs were extensively studied in III–V and II–VI semiconductor heterostructures where IX range of existence has been limited to low temperatures. Here, we present the observation of IXs at room temperature in van der Waals transition metal dichalcogenide (TMD) heterostructures. Here, this is achieved in TMD heterostructures based on monolayers of MoS2 separated by atomically thin hexagonal boron nitride. The IXs we realize in the TMD heterostructure have lifetimes orders of magnitude longer than lifetimes of direct excitons in single-layer TMD and their energy is gate controlled. The realization of IXs at room temperature establishes the TMD heterostructures as a material platform both for a field of high-temperature quantum Bose gases of IXs and for a field of high-temperature excitonic devices.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, San Diego, La Jolla, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: FG02-07ER46449

OSTI ID:: 1499677

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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