Ultrafast Coherent Exciton Couplings and Many-Body Interactions in Monolayer WS 2 .

Autor:	Timmer D; Institut für Physik, Carl von Ossietzky Universität Oldenburg, 26129 Oldenburg, Germany., Gittinger M; Institut für Physik, Carl von Ossietzky Universität Oldenburg, 26129 Oldenburg, Germany., Quenzel T; Institut für Physik, Carl von Ossietzky Universität Oldenburg, 26129 Oldenburg, Germany., Cadore AR; Cambridge Graphene Centre, University of Cambridge, CB3 0FA Cambridge, United Kingdom., Rosa BLT; Cambridge Graphene Centre, University of Cambridge, CB3 0FA Cambridge, United Kingdom., Li W; Cambridge Graphene Centre, University of Cambridge, CB3 0FA Cambridge, United Kingdom., Soavi G; Cambridge Graphene Centre, University of Cambridge, CB3 0FA Cambridge, United Kingdom., Lünemann DC; Institut für Physik, Carl von Ossietzky Universität Oldenburg, 26129 Oldenburg, Germany., Stephan S; Institut für Physik, Carl von Ossietzky Universität Oldenburg, 26129 Oldenburg, Germany., Silies M; Institut für Physik, Carl von Ossietzky Universität Oldenburg, 26129 Oldenburg, Germany., Schulz T; Institute for Theoretical Physics and Bremen Center for Computational Materials Science, University of Bremen, P.O. Box 330 440, 28334 Bremen, Germany., Steinhoff A; Institute for Theoretical Physics and Bremen Center for Computational Materials Science, University of Bremen, P.O. Box 330 440, 28334 Bremen, Germany., Jahnke F; Institute for Theoretical Physics and Bremen Center for Computational Materials Science, University of Bremen, P.O. Box 330 440, 28334 Bremen, Germany., Cerullo G; Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy.; Istituto di Fotonica e Nanotecnologie-CNR, Piazza L. da Vinci 32, 20133 Milano, Italy., Ferrari AC; Cambridge Graphene Centre, University of Cambridge, CB3 0FA Cambridge, United Kingdom., De Sio A; Institut für Physik, Carl von Ossietzky Universität Oldenburg, 26129 Oldenburg, Germany.; Center for Nanoscale Dynamics (CENAD), Carl von Ossietzky Universität Oldenburg, Institut für Physik, 26129 Oldenburg, Germany., Lienau C; Institut für Physik, Carl von Ossietzky Universität Oldenburg, 26129 Oldenburg, Germany.; Center for Nanoscale Dynamics (CENAD), Carl von Ossietzky Universität Oldenburg, Institut für Physik, 26129 Oldenburg, Germany.
Jazyk:	angličtina
Zdroj:	Nano letters [Nano Lett] 2024 Jul 03; Vol. 24 (26), pp. 8117-8125. Date of Electronic Publication: 2024 Jun 20.
DOI:	10.1021/acs.nanolett.4c01991
Abstrakt:	Transition metal dichalcogenides (TMDs) are quantum confined systems with interesting optoelectronic properties, governed by Coulomb interactions in the monolayer (1L) limit, where strongly bound excitons provide a sensitive probe for many-body interactions. Here, we use two-dimensional electronic spectroscopy (2DES) to investigate many-body interactions and their dynamics in 1L-WS 2 at room temperature and with sub-10 fs time resolution. Our data reveal coherent interactions between the strongly detuned A and B exciton states in 1L-WS 2 . Pronounced ultrafast oscillations of the transient optical response of the B exciton are the signature of a coherent 50 meV coupling and coherent population oscillations between the two exciton states. Supported by microscopic semiconductor Bloch equation simulations, these coherent dynamics are rationalized in terms of Dexter-like interactions. Our work sheds light on the role of coherent exciton couplings and many-body interactions in the ultrafast temporal evolution of spin and valley states in TMDs.
Databáze:	MEDLINE
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