Interaction-Induced ac Stark Shift of Exciton-Polaron Resonances

Laser-induced shift of atomic states due to the ac Stark effect has played a central role in cold-atom physics and facilitated their emergence as analog quantum simulators. Here, we explore this phenomenon in an atomically thin layer of semiconductor MoSe_{2}, which we embedded in a heterostructure...

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Bibliographic Details
Published in:Physical review letters 2024-02, Vol.132 (5), p.056901-056901, Article 056901
Main Authors: Uto, T, Evrard, B, Watanabe, K, Taniguchi, T, Kroner, M, İmamoğlu, A
Format: Article
Language:English
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Summary:Laser-induced shift of atomic states due to the ac Stark effect has played a central role in cold-atom physics and facilitated their emergence as analog quantum simulators. Here, we explore this phenomenon in an atomically thin layer of semiconductor MoSe_{2}, which we embedded in a heterostructure enabling charge tunability. Shining an intense pump laser with a small detuning from the material resonances, we generate a large population of virtual collective excitations and achieve a regime where interactions with this background population are the leading contribution to the ac Stark shift. Using this technique we study how itinerant charges modify-and dramatically enhance-the interactions between optical excitations. In particular, our experiments show that the interaction between attractive polarons could be more than an order of magnitude stronger than those between bare excitons.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.132.056901