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, S. Höfling, F. Eilenberger, C. Schneider

Результат исследований: Научные публикации в периодических изданияхстатья

Аннотация

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.

Язык оригиналаанглийский
Номер статьи121303
ЖурналPhysical Review B
Том100
Номер выпуска12
DOI
СостояниеОпубликовано - 27 сен 2019
Опубликовано для внешнего пользованияДа

Предметные области Scopus

  • Электроника, оптика и магнитные материалы
  • Физика конденсатов

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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., & Schneider, C. (2019). Magnetic-field-induced splitting and polarization of monolayer-based valley exciton polaritons. Physical Review B, 100(12), [121303]. https://doi.org/10.1103/PhysRevB.100.121303