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Plechinger G, Nagler P, Arora A, et al. Excitonic Valley Effects in Monolayer WS. Nano Lett. 2016;16(12):7899-7904doi: 10.1021/acs.nanolett.6b04171.
Plechinger, G., Nagler, P., Arora, A., Granados Del Águila, A., Ballottin, M. V., Frank, T., Steinleitner, P., Gmitra, M., Fabian, J., Christianen, P. C., Bratschitsch, R., Schüller, C., & Korn, T. (2016). Excitonic Valley Effects in Monolayer WS. Nano letters, 16(12), 7899-7904. https://doi.org/10.1021/acs.nanolett.6b04171
Plechinger, Gerd, et al. "Excitonic Valley Effects in Monolayer WS." Nano letters vol. 16,12 (2016): 7899-7904. doi: https://doi.org/10.1021/acs.nanolett.6b04171
Plechinger G, Nagler P, Arora A, Granados Del Águila A, Ballottin MV, Frank T, Steinleitner P, Gmitra M, Fabian J, Christianen PC, Bratschitsch R, Schüller C, Korn T. Excitonic Valley Effects in Monolayer WS. Nano Lett. 2016 Dec 14;16(12):7899-7904. doi: 10.1021/acs.nanolett.6b04171. Epub 2016 Nov 29. PMID: 27960453.
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Nano Lett. 2016 Dec 14;16(12):7899-7904. doi: 10.1021/acs.nanolett.6b04171. Epub 2016 Nov 29.

Excitonic Valley Effects in Monolayer WS.

Nano letters

Gerd Plechinger, Philipp Nagler, Ashish Arora, Andrés Granados Del Águila, Mariana V Ballottin, Tobias Frank, Philipp Steinleitner, Martin Gmitra, Jaroslav Fabian, Peter C M Christianen, Rudolf Bratschitsch, Christian Schüller, Tobias Korn

Affiliations

  1. Institut für Experimentelle und Angewandte Physik, Universität Regensburg , D-93040 Regensburg, Germany.
  2. Institute of Physics and Center for Nanotechnology, University of Münster , 48149 Münster, Germany.
  3. High Field Magnet Laboratory (HFML-EMFL), Radboud University , Toernooiveld 7, 6525 ED Nijmegen, The Netherlands.
  4. Institut für Theoretische Physik, Universität Regensburg , D-93040 Regensburg, Germany.

PMID: 27960453 DOI: 10.1021/acs.nanolett.6b04171

Abstract

Transition-metal dichalcogenides can be easily produced as atomically thin sheets, exhibiting the possibility to optically polarize and read out the valley pseudospin of extremely stable excitonic quasiparticles present in these 2D semiconductors. Here, we investigate a monolayer of tungsten disulfide in high magnetic fields up to 30 T via photoluminescence spectroscopy at low temperatures. The valley degeneracy is lifted for all optical features, particularly for excitons, singlet and triplet trions, for which we determine the g factor separately. While the observation of a diamagnetic shift of the exciton and trion resonances gives us insight into the real-space extension of these quasiparticles, magnetic field-induced valley polarization effects shed light onto the exciton and trion dispersion relations in reciprocal space. The field dependence of the trion valley polarizations is in line with the predicted trion splitting into singlet and triplet configurations.

Keywords: 2D materials; Transition metal dichalcogenides; WS2; excitons; valley polarization; valley splitting

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