Measurement of the conduction band spin-orbit splitting in $\mathrm{WSe_2}$ and $\mathrm{WS_2}$ monolayers

Ren, Lei; Robert, Cedric; Dery, Hanan; He, Minhao; Li, Pengke; Van Tuan, Dinh; Renucci, Pierre; Lagarde, Delphine; Taniguchi, Takashi; Watanabe, Kenji; Xu, Xiaodong; Marie, Xavier

doi:10.1103/physrevb.107.245407

Measurement of the conduction band spin-orbit splitting in $$\mathrm{WSe_2}$$ and $$\mathrm{WS_2}$$ monolayers

Journal Article · Tue Jun 06 00:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.107.245407· OSTI ID:1994840

Ren, Lei ^[1]; Robert, Cedric ^[2]; ^[3]; He, Minhao ^[4]; ^[3]; ^[3]; Renucci, Pierre ^[2]; Lagarde, Delphine ^[2]; Taniguchi, Takashi ^[5]; ^[5]; Xu, Xiaodong ^[4]; ^[2]

University of Toulouse (France); University of Rochester
University of Toulouse (France)
University of Rochester, NY (United States)
University of Washington, Seattle, WA (United States)
National Institute for Materials Science (NIMS), Tsukuba (Japan)

We have investigated charge tunable devices based on $$\mathrm{WSe_2}$$ and $$\mathrm{WS_2}$$monolayers encapsulated in hexagonal boron nitride. In addition to the well-known radiative recombination of neutral and charged excitons, stationary photoluminescence measurements highlight a weaker-intensity optical transition that appears when the monolayer is electrostatically doped with electrons. We have carried out a detailed characterization of this photoluminescence line based on its doping dependence, its variation as a function of the optical excitation power, its polarization characteristics, and its g factor measured under longitudinal magnetic field. We interpret this luminescence peak as an impurity-assisted radiative recombination of the intervalley negatively charged exciton (triplet trion). In addition to the standard direct recombination, the triplet trion has a second recombination channel triggered by elastic scattering off the short-range impurity potential. The energy difference between the emitted photons from these two possible recombination processes of the same triplet trion is simply the single-particle conduction band spin-orbit splitting Δ_c. We measure Δ_c= 12 ± 0.5 meV for the $$\mathrm{WSe_2}$$ monolayer and Δ_c= 12 ± 1 meV for the $$\mathrm{WS_2}$$ monolayer. Here, these results demonstrate the importance of second-order exciton recombination processes in transition-metal dichalcogenide structures.

View Accepted Manuscript (DOE)

Research Organization:: University of Rochester, NY (United States); University of Washington, Seattle, WA (United States)

Sponsoring Organization:: Agence Nationale de la Recherche; US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0014349; SC0018171

OSTI ID:: 1994840

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 24 Vol. 107; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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