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.
In: Physical Review B, Vol. 100, No. 12, 121303, 27.09.2019.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Magnetic-field-induced splitting and polarization of monolayer-based valley exciton polaritons
AU - Lundt, N.
AU - Klaas, M.
AU - Sedov, E.
AU - Waldherr, M.
AU - Knopf, H.
AU - Blei, M.
AU - Tongay, S.
AU - Klembt, S.
AU - Taniguchi, T.
AU - Watanabe, K.
AU - Schulz, U.
AU - Kavokin, A.
AU - Höfling, S.
AU - Eilenberger, F.
AU - Schneider, C.
PY - 2019/9/27
Y1 - 2019/9/27
N2 - 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.
AB - 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.
KW - excitons
KW - Landforms
KW - Molybdenum compounds
KW - Monolayers
KW - Phonons
KW - PHOTONS
KW - Polarization
KW - Selenium compounds
KW - transition metals
KW - GENERATION
KW - COHERENCE
UR - http://www.scopus.com/inward/record.url?scp=85072798746&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.100.121303
DO - 10.1103/PhysRevB.100.121303
M3 - Article
AN - SCOPUS:85072798746
VL - 100
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 12
M1 - 121303
ER -
ID: 49437302