Research output: Contribution to journal › Article › peer-review
Manipulation of room-temperature valley-coherent exciton-polaritons in atomically thin crystals by real and artificial magnetic fields. / Rupprecht, Christoph; Sedov, Evgeny; Klaas, Martin; Knopf, Heiko; Blei, Mark; Lundt, Nils; Tongay, Sefaattin; Taniguchi, Takashi; Watanabe, Kenji; Schulz, Ulrike; Kavokin, Alexey; Eilenberger, Falk; Höfling, Sven; Schneider, Christian.
In: 2D Materials, Vol. 7, No. 3, 035025, 07.2020.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Manipulation of room-temperature valley-coherent exciton-polaritons in atomically thin crystals by real and artificial magnetic fields
AU - Rupprecht, Christoph
AU - Sedov, Evgeny
AU - Klaas, Martin
AU - Knopf, Heiko
AU - Blei, Mark
AU - Lundt, Nils
AU - Tongay, Sefaattin
AU - Taniguchi, Takashi
AU - Watanabe, Kenji
AU - Schulz, Ulrike
AU - Kavokin, Alexey
AU - Eilenberger, Falk
AU - Höfling, Sven
AU - Schneider, Christian
PY - 2020/7
Y1 - 2020/7
N2 - Strong spin-orbit coupling and inversion symmetry breaking in transition metal dichalcogenide monolayers yield the intriguing effects of valley-dependent optical selection rules. As such, it is possible to substantially polarize valley excitons with chiral light and furthermore create coherent superpositions of K and K' polarized states. Yet, at ambient conditions dephasing usually becomes too dominant, and valley coherence typically is not observable. Here, we demonstrate that valley coherence is, however, clearly observable for a single monolayer of WSe2, if it is strongly coupled to the optical mode of a high quality factor microcavity. The azimuthal vector, representing the phase of the valley coherent superposition, can be directly manipulated by applying magnetic fields, and furthermore, it sensibly reacts to the polarization anisotropy of the cavity which represents an artificial magnetic field. Our results are in qualitative and quantitative agreement with our model based on pseudospin rate equations, accounting for both effects of real and pseudo-magnetic fields.
AB - Strong spin-orbit coupling and inversion symmetry breaking in transition metal dichalcogenide monolayers yield the intriguing effects of valley-dependent optical selection rules. As such, it is possible to substantially polarize valley excitons with chiral light and furthermore create coherent superpositions of K and K' polarized states. Yet, at ambient conditions dephasing usually becomes too dominant, and valley coherence typically is not observable. Here, we demonstrate that valley coherence is, however, clearly observable for a single monolayer of WSe2, if it is strongly coupled to the optical mode of a high quality factor microcavity. The azimuthal vector, representing the phase of the valley coherent superposition, can be directly manipulated by applying magnetic fields, and furthermore, it sensibly reacts to the polarization anisotropy of the cavity which represents an artificial magnetic field. Our results are in qualitative and quantitative agreement with our model based on pseudospin rate equations, accounting for both effects of real and pseudo-magnetic fields.
KW - transition metal dichalcogenides
KW - exciton polaritons
KW - valley coherence
KW - strong light matter coupling
KW - POLARIZATION
KW - GENERATION
KW - WSE2
KW - SPIN
UR - http://www.scopus.com/inward/record.url?scp=85089074221&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/8fe6c0b5-b0bd-36f0-91c0-95c79da2153e/
U2 - 10.1088/2053-1583/ab8e90
DO - 10.1088/2053-1583/ab8e90
M3 - Article
AN - SCOPUS:85089074221
VL - 7
JO - 2D Materials
JF - 2D Materials
SN - 2053-1583
IS - 3
M1 - 035025
ER -
ID: 62025249