Giant self-driven exciton-Floquet signatures in time-resolved photoemission spectroscopy of MoS 2 from time-dependent GW approach.

Autor: Chan YH; Department of Physics, University of California, Berkeley, CA 94720-7300.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.; Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan.; Physics Division, National Center of Theoretical Sciences, Taipei 10617, Taiwan., Qiu DY; Department of Physics, University of California, Berkeley, CA 94720-7300.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.; Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT 06520., da Jornada FH; Department of Physics, University of California, Berkeley, CA 94720-7300.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.; Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305.; Stanford PULSE Institute, Stanford Linear Accelerator Center National Accelerator Laboratory, Menlo Park, CA 94025., Louie SG; Department of Physics, University of California, Berkeley, CA 94720-7300.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.
Jazyk: angličtina
Zdroj: Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2023 Aug 08; Vol. 120 (32), pp. e2301957120. Date of Electronic Publication: 2023 Jul 31.
DOI: 10.1073/pnas.2301957120
Abstrakt: 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 MoS 2 . 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 mechanisms for band structure engineering.
Databáze: MEDLINE