Interaction-Induced ac Stark Shift of Exciton-Polaron Resonances.
Phys Rev Lett
; 132(5): 056901, 2024 Feb 02.
Article
em En
| MEDLINE
| ID: mdl-38364159
ABSTRACT
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.
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MEDLINE
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Ano de publicação:
2024
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Article