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

: 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.; Schneider, C.


Physical Review. B 100 (2019), No.12, Art. 121303
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
ISSN: 2469-9950
European Commission EC
679288; unLiMIt-2D
Unique Light-Matter Interactions with Two-Dimensional Materials
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
13XP5053A; SMiLE
Systemintegrativer Multi-Material-Leichtbau für die Elektromobilität
Journal Article
Fraunhofer IOF ()

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.