Journal
2D MATERIALS
Volume 7, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/ab8e90
Keywords
transition metal dichalcogenides; exciton polaritons; valley coherence; strong light matter coupling
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Funding
- state of Bavaria
- European Research Commission (Project unLiMIt-2D)
- EPSRC within the Hybrid Polaritonic Project
- Fraunhofer-Gesellschaft zur Forderung der angewandten Forschung e.V. F.E
- German Federal Ministry of Education and Research [13XP5053A]
- Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang [041020100118, 2018R01002]
- Russian Federation [MK-2839.2019.2]
- Saint-Petersburg State University [51125686]
- Elemental Strategy Initiative by the MEXT, Japan
- CREST, JST [JPMJCR15F3]
- NSF [DMR-1955668, DMR-1838443]
- DOE [DE-SC0020653]
- Max Planck School of Photonics
- U.S. Department of Energy (DOE) [DE-SC0020653] Funding Source: U.S. Department of Energy (DOE)
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Strong spin-orbit coupling and inversion symmetry breaking in transition metal dichalcogenide monolayers yield the intriguing effects of valley-dependent optical selection rules. As such, it is possible to substantially polarize valley excitons with chiral light and furthermore create coherent superpositions of K and K' polarized states. Yet, at ambient conditions dephasing usually becomes too dominant, and valley coherence typically is not observable. Here, we demonstrate that valley coherence is, however, clearly observable for a single monolayer of WSe2, if it is strongly coupled to the optical mode of a high quality factor microcavity. The azimuthal vector, representing the phase of the valley coherent superposition, can be directly manipulated by applying magnetic fields, and furthermore, it sensibly reacts to the polarization anisotropy of the cavity which represents an artificial magnetic field. Our results are in qualitative and quantitative agreement with our model based on pseudospin rate equations, accounting for both effects of real and pseudo-magnetic fields.
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