Ultrafast Coherent Exciton Couplings and Many-Body Interactions in Monolayer WS2

被引：10

作者：

Timmer, Daniel ^{[1
]}

Gittinger, Moritz ^{[1
]}

Quenzel, Thomas ^{[1
]}

Cadore, Alisson R. ^{[2
]}

Rosa, Barbara L. T. ^{[2
]}

Li, Wenshan ^{[2
]}

Soavi, Giancarlo ^{[2
,3
,4
]}

Lunemann, Daniel C. ^{[1
]}

Stephan, Sven ^{[1
,5
]}

Silies, Martin ^{[1
,5
]}

Schulz, Tommy ^{[6
,7
]}

Steinhoff, Alexander ^{[6
,7
]}

Jahnke, Frank ^{[6
,7
]}

Cerullo, Giulio ^{[8
,9
]}

Ferrari, Andrea C. ^{[2
]}

De Sio, Antonietta ^{[1
,10
]}

Lienau, Christoph ^{[1
,10
]}

机构：

[1] Carl von Ossietzky Univ Oldenburg, Inst Phys, D-26129 Oldenburg, Germany

[2] Univ Cambridge, Cambridge Graphene Ctr, Cambridge CB3 0FA, England

[3] Friedrich Schiller Univ Jena, Inst Solid State Phys, Max Wien Pl 1, D-07743 Jena, Germany

[4] Friedrich Schiller Univ Jena, Abbe Ctr Photon, Albert Einstein Str 6, D-07745 Jena, Germany

[5] Univ Appl Sci, Inst Lasers & Opt, D-26723 Emden, Germany

[6] Univ Bremen, Inst Theoret Phys, D-28334 Bremen, Germany

[7] Univ Bremen, Bremen Ctr Computat Mat Sci, D-28334 Bremen, Germany

[8] Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy

[9] Ist Foton & Nanotecnol IFN CNR, I-20133 Milan, Italy

[10] Carl Von Ossietzky Univ Oldenburg, Ctr Nanoscale Dynam CENAD, Inst Phys, D-26129 Oldenburg, Germany

来源：

NANO LETTERS | 2024年 / 24卷 / 26期

基金：

英国工程与自然科学研究理事会;

关键词：

transition metal dichalcogenides; ultrafast spectroscopy; many-body interactions; coherent couplings; MOS2; SPECTROSCOPY; DYNAMICS; GRAPHENE;

D O I：

10.1021/acs.nanolett.4c01991

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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-WS2 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-WS2. 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.

引用

页码：8117 / 8125

页数：9

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