Infrared Interlayer Exciton Emission in MoS2/WSe2 Heterostructures
| Autor: | Eric Yue Ma, Janina Maultzsch, Elyse Barré, Ralph H. Page, Kenji Watanabe, Bumho Kim, Tony F. Heinz, Ouri Karni, Sze Cheung Lau, Takashi Taniguchi, Katayun Barmak, Roland Gillen |
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| Rok vydání: | 2019 |
| Předmět: |
Silicon photonics
Materials science Condensed matter physics Infrared Exciton General Physics and Astronomy Heterojunction Electronic structure Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences Transition metal dichalcogenide monolayers Condensed Matter::Materials Science Dipole 0103 physical sciences Light emission 010306 general physics |
| Zdroj: | Physical Review Letters. 123 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.123.247402 |
| Popis: | We report light emission around 1 eV (1240 nm) from heterostructures of MoS_{2} and WSe_{2} transition metal dichalcogenide monolayers. We identify its origin in an interlayer exciton (ILX) by its wide spectral tunability under an out-of-plane electric field. From the static dipole moment of the state, its temperature and twist-angle dependence, and comparison with electronic structure calculations, we assign this ILX to the fundamental interlayer transition between the K valleys in this system. Our findings gain access to the interlayer physics of the intrinsically incommensurate MoS_{2}/WSe_{2} heterostructure, including moire and valley pseudospin effects, and its integration with silicon photonics and optical fiber communication systems operating at wavelengths longer than 1150 nm. |
| Databáze: | OpenAIRE |
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