Probing and Manipulating Valley Coherence of Dark Excitons in Monolayer WSe 2
| Autor: | P. Kapuściński, T. Taniguchi, A. O. Slobodeniuk, Kenji Watanabe, K. Oreszczuk, Maciej R. Molas, Clément Faugeras, Piotr Kossacki, Marek Potemski, Denis M. Basko, Karol Nogajewski, Miroslav Bartos, Tomasz Kazimierczuk |
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| Přispěvatelé: | Laboratoire national des champs magnétiques intenses - Grenoble (LNCMI-G ), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), National Institute for Materials Science (NIMS), Laboratoire de physique et modélisation des milieux condensés (LPM2C), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Photoluminescence
Materials science Valence (chemistry) Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Exciton Exchange interaction FOS: Physical sciences General Physics and Astronomy Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences Magnetic field Condensed Matter::Materials Science Transition metal [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph] Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Monolayer 010306 general physics ComputingMilieux_MISCELLANEOUS Coherence (physics) |
| Zdroj: | Physical Review Letters Physical Review Letters, American Physical Society, 2019, 123 (9), ⟨10.1103/PhysRevLett.123.096803⟩ |
| ISSN: | 0031-9007 1079-7114 |
| Popis: | Monolayers of semiconducting transition metal dichalcogenides are two-dimensional direct-gap systems which host tightly-bound excitons with an internal degree of freedom corresponding to the valley of the constituting carriers. Strong spin-orbit interaction and the resulting ordering of the spin-split subbands in the valence and conduction bands makes the lowest-lying excitons in WX$_2$ (X~being S or Se) spin-forbidden and optically dark. With polarization-resolved photoluminescence experiments performed on a WSe$_2$ monolayer encapsulated in a hexagonal boron nitride, we show how the intrinsic exchange interaction in combination with the applied in-plane and/or out-of-plane magnetic fields enables one to probe and manipulate the valley degree of freedom of the dark excitons. Manuscript: 6 pages, 3 figures; SM: 6 pages, 5 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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