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Magnetic-field-induced splitting and polarization of monolayer-based valley exciton polaritons

Magnetic-field-induced splitting and polarization of monolayer-based valley exciton polaritons
Magnetic-field-induced splitting and polarization of monolayer-based valley exciton polaritons

Atomically thin crystals of transition-metal dichalcogenides are ideally suited to study the interplay of light-matter coupling, polarization, and magnetic field effects. In this Rapid Communication, we investigate the formation of exciton polaritons in a MoSe2 monolayer, which is integrated in a fully grown, monolithic microcavity. Due to the narrow linewidth of the polaritonic resonances, we are able to directly investigate the emerging valley Zeeman splitting of the hybrid light-matter resonances in the presence of a magnetic field. At a detuning of -54.5 meV (13.5% matter constituent of the lower polariton branch), we find a Zeeman splitting of the lower polariton branch of 0.36 meV, which can be directly associated with an excitonic g-factor of 3.94±0.13. Remarkably, we find that a magnetic field of 6 T is sufficient to induce a notable valley polarization of 15% in our polariton system, which approaches 30% at 9 T. This circular polarization degree of the polariton (ground) state exceeds the polarization of the exciton reservoir for equal magnetic field magnitudes by approximately 50%, which is a clear hint of valley-dependent bosonic stimulation in our strongly coupled system in the subthreshold, fluctuation-dominated regime.

2469-9950
Lundt, N.
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Klaas, M.
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Sedov, E.
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Waldherr, M.
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Knopf, H.
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Blei, M.
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Tongay, S.
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Klembt, S.
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Taniguchi, T.
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Watanabe, K.
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Schulz, U.
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Kavokin, A.
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Höfling, S.
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Eilenberger, F.
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Schneider, C.
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Lundt, N.
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Klaas, M.
c418ef44-ce6c-461c-a04e-f60eb1e5bfd0
Sedov, E.
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Waldherr, M.
549e7797-71a7-4513-9b06-974286731716
Knopf, H.
b7791011-5731-491a-b8b2-d824a361bb33
Blei, M.
2520d141-7b1b-4fd4-9f9d-54b4274d471f
Tongay, S.
08a1239d-3add-43db-996e-fc80e9f55a58
Klembt, S.
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Taniguchi, T.
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Watanabe, K.
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Schulz, U.
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Kavokin, A.
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Höfling, S.
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Eilenberger, F.
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Schneider, C.
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Lundt, N., Klaas, M., Sedov, E., Waldherr, M., Knopf, H., Blei, M., Tongay, S., Klembt, S., Taniguchi, T., Watanabe, K., Schulz, U., Kavokin, A., Höfling, S., Eilenberger, F. and Schneider, C. (2019) Magnetic-field-induced splitting and polarization of monolayer-based valley exciton polaritons. Physical Review B, 100 (12), [121303]. (doi:10.1103/PhysRevB.100.121303).

Record type: Article

Abstract

Atomically thin crystals of transition-metal dichalcogenides are ideally suited to study the interplay of light-matter coupling, polarization, and magnetic field effects. In this Rapid Communication, we investigate the formation of exciton polaritons in a MoSe2 monolayer, which is integrated in a fully grown, monolithic microcavity. Due to the narrow linewidth of the polaritonic resonances, we are able to directly investigate the emerging valley Zeeman splitting of the hybrid light-matter resonances in the presence of a magnetic field. At a detuning of -54.5 meV (13.5% matter constituent of the lower polariton branch), we find a Zeeman splitting of the lower polariton branch of 0.36 meV, which can be directly associated with an excitonic g-factor of 3.94±0.13. Remarkably, we find that a magnetic field of 6 T is sufficient to induce a notable valley polarization of 15% in our polariton system, which approaches 30% at 9 T. This circular polarization degree of the polariton (ground) state exceeds the polarization of the exciton reservoir for equal magnetic field magnitudes by approximately 50%, which is a clear hint of valley-dependent bosonic stimulation in our strongly coupled system in the subthreshold, fluctuation-dominated regime.

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Magnetic field induced splitting and polarization of monolayer-based valley excition-polartions - Accepted Manuscript
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e-pub ahead of print date: 27 September 2019

Identifiers

Local EPrints ID: 435355
URI: http://eprints.soton.ac.uk/id/eprint/435355
ISSN: 2469-9950
PURE UUID: 6d7835a2-e321-4413-ae18-f47a35433f29

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Date deposited: 31 Oct 2019 17:30
Last modified: 25 Nov 2021 17:03

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Contributors

Author: N. Lundt
Author: M. Klaas
Author: E. Sedov
Author: M. Waldherr
Author: H. Knopf
Author: M. Blei
Author: S. Tongay
Author: S. Klembt
Author: T. Taniguchi
Author: K. Watanabe
Author: U. Schulz
Author: A. Kavokin
Author: S. Höfling
Author: F. Eilenberger
Author: C. Schneider

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