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

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

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4 Citations (Scopus)

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 work, 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 lowerpolariton 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 suffcient 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 sub-threshold, fluctuation dominated regime.
Original languageEnglish
Article number121303(R)
JournalPhysical Review. B, Condensed matter and materials physics
Volume100
DOIs
Publication statusPublished - 27 Sept 2019

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