Giant self-driven exciton-Floquet signatures in time-resolved photoemission spectroscopy of MoS₂ from time-dependent GW approach.

ABSTRACT: Time-resolved, angle-resolved photoemission spectroscopy (TR-ARPES) is a one-particle spectroscopic technique that can probe excitons (two-particle excitations) in momentum space. We present an ab initio, time-domain GW approach to TR-ARPES and apply it to monolayer MoS₂. We show that photoexcited excitons may be measured and quantified as satellite bands and lead to the renormalization of the quasiparticle bands. These features are explained in terms of an exciton-Floquet phenomenon induced by an exciton time-dependent bosonic field, which are orders of magnitude stronger than those of laser field-induced Floquet bands in low-dimensional semiconductors. Our findings imply a way to engineer Floquet matter through the coherent oscillation of excitons and open the new door for mec

SUBMITTER: Chan YH 

PROVIDER: S-EPMC10410765 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature