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

Robert, Cedric; Park, Sangjun; Cadiz, Fabian; Lombez, Laurent; Ren, Lei; Tornatzky, Hans; Rowe, Alistair; Paget, Daniel; Sirotti, Fausto; Yang, Min; Van Tuan, Dinh; Taniguchi, Takashi; Urbaszek, Bernhard; Watanabe, Kenji; Amand, Thierry; Dery, Hanan; Marie, Xavier

doi:10.1038/s41467-021-25747-5

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

Journal Article · 15 September 2021 · Nature Communications

DOI: https://doi.org/10.1038/s41467-021-25747-5 · OSTI ID:1820214

;

; Cadiz, Fabian; Lombez, Laurent; Ren, Lei; Tornatzky, Hans; Rowe, Alistair; Paget, Daniel;

;

; Van Tuan, Dinh;

;

; Amand, Thierry; Dery, Hanan; Marie, Xavier

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 WSe ₂ and WS ₂ 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.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; SC0014349

OSTI ID:: 1820214

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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