Indirect excitons in van der Waals heterostructures at room temperature

Nature Communications
E V CalmanA K Geim

Abstract

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. 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.

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Citations

Dec 15, 2018·Advanced Materials·Byung Chul LeeMin-Kyu Joo
Jan 10, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Mahfujur RahamanDietrich R T Zahn
Feb 23, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·O Ávalos-OvandoS E Ulloa
Jun 4, 2019·Advanced Materials·Peter SutterEli Sutter
Sep 26, 2019·Physical Chemistry Chemical Physics : PCCP·Zhuang MaFei Wang
Jun 5, 2019·Nature Communications·Miao-Ling LinPing-Heng Tan
Aug 12, 2020·Nature Nanotechnology·Nadine LeisgangBernhard Urbaszek
Aug 25, 2018·Physical Review Letters·Ming Xie, A H MacDonald
Nov 9, 2019·Physical Review Letters·Øyvind JohansenRembert A Duine
Sep 7, 2019·Physical Review Letters·J J Esteve-ParedesJ J Palacios
Jan 31, 2021·International Journal of Molecular Sciences·Tao HanZhandong Li
Aug 8, 2018·ACS Nano·Miao-Ling LinPing-Heng Tan
Aug 31, 2021·Physical Review Letters·Koloman WagnerAlexey Chernikov
Sep 26, 2021·Advanced Materials·Soumyabrata RoyPulickel M Ajayan

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