[12a-S302-8~11] 10.4 Semiconductor spintronics, superconductor, multiferroics

▼ [12a-S302-11] Intravalley Scattering Probed by Excitation Energy Dependence of Valley Polarization in Monolayer MoS₂

〇(M1)Takeshi Odagawa¹, Eito Asakura¹, Masaki Suzuki¹, Shutaro Karube^1,2, Junsaku Nitta^1,2,3, Makoto Kohda^1,2,3,4 (1.Dept. of Mat. Sci., Tohoku Univ., 2.CSRN, Tohoku Univ., 3.CSIS, Tohoku Univ., 4.FRiD, Tohoku Univ.)

Keywords:Transition-metal dichalcogenides, Intravalley scattering, Valley polarization

Monolayer transition-metal dichalcogenides (ML-TMDCs) show strong enhancement of the Coulomb interaction and the spin-orbit coupling, as well as the emergence of the valley degree of freedom (VDoF). The utilization of VDoF as a spin-like quantum number requires deep understanding of the valley depolarization. Here, we reveal the mechanism of the intravalley scattering from B- to A-exciton in ML-MoS₂ via photoluminescence spectroscopy, and show the universality of its mechanism within ML-TMDCs. The steady-state valley polarization can be a sensitive probe for the intravalley scattering, which accelarates research on the valley scattering.