Optically controlled single-valley exciton doublet states with tunable internal spin structures and spin magnetization generation.

ABSTRACT: Manipulating quantum states through light-matter interactions has been actively pursued in two-dimensional materials research. Significant progress has been made toward the optical control of the valley degrees of freedom in semiconducting monolayer transition-metal dichalcogenides, based on doubly degenerate excitons from their two distinct valleys in reciprocal space. Here, we introduce a type of optically controllable doubly degenerate exciton states that come from a single valley, dubbed as single-valley exciton doublet (SVXD) states. They are unique in that their constituent holes originate from the same valence band, making possible the direct optical control of the spin structure of the excited constituent electrons. Combining ab initio GW plus Bethe-Salpeter equation (GW<

SUBMITTER: Ruan J 

PROVIDER: S-EPMC10401001 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature