Spin/valley pumping of resident electrons in WSe2 and WS2 monolayers

Cedric Robert (), Sangjun Park, Fabian Cadiz (), Laurent Lombez, Lei Ren, Hans Tornatzky, Alistair Rowe, Daniel Paget, Fausto Sirotti, Min Yang, Dinh Tuan, Takashi Taniguchi, Bernhard Urbaszek, Kenji Watanabe, Thierry Amand, Hanan Dery and Xavier Marie ()
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Cedric Robert: Université de Toulouse, INSA-CNRS-UPS, LPCNO
Sangjun Park: Physique de la matière condensée, Ecole Polytechnique, CNRS, IP Paris
Fabian Cadiz: Physique de la matière condensée, Ecole Polytechnique, CNRS, IP Paris
Laurent Lombez: Université de Toulouse, INSA-CNRS-UPS, LPCNO
Lei Ren: Université de Toulouse, INSA-CNRS-UPS, LPCNO
Hans Tornatzky: Université de Toulouse, INSA-CNRS-UPS, LPCNO
Alistair Rowe: Physique de la matière condensée, Ecole Polytechnique, CNRS, IP Paris
Daniel Paget: Physique de la matière condensée, Ecole Polytechnique, CNRS, IP Paris
Fausto Sirotti: Physique de la matière condensée, Ecole Polytechnique, CNRS, IP Paris
Min Yang: University of Rochester
Dinh Tuan: University of Rochester
Takashi Taniguchi: National Institute for Materials Science
Bernhard Urbaszek: Université de Toulouse, INSA-CNRS-UPS, LPCNO
Kenji Watanabe: National Institute for Materials Science
Thierry Amand: Université de Toulouse, INSA-CNRS-UPS, LPCNO
Hanan Dery: University of Rochester
Xavier Marie: Université de Toulouse, INSA-CNRS-UPS, LPCNO

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Monolayers of transition metal dichalcogenides are ideal materials to control both spin and valley degrees of freedom either electrically or optically. Nevertheless, optical excitation mostly generates excitons species with inherently short lifetime and spin/valley relaxation time. Here we demonstrate a very efficient spin/valley optical pumping of resident electrons in n-doped WSe2 and WS2 monolayers. We observe that, using a continuous wave laser and appropriate doping and excitation densities, negative trion doublet lines exhibit circular polarization of opposite sign and the photoluminescence intensity of the triplet trion is more than four times larger with circular excitation than with linear excitation. We interpret our results as a consequence of a large dynamic polarization of resident electrons using circular light.

Date: 2021
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DOI: 10.1038/s41467-021-25747-5

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