Interaction-driven transport of dark excitons in 2D semiconductors with phonon-mediated optical readout

Saroj B. Chand, John M. Woods, Jiamin Quan, Enrique Mejia, Takashi Taniguchi, Kenji Watanabe, Andrea Alù and Gabriele Grosso ()
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Saroj B. Chand: City University of New York
John M. Woods: City University of New York
Jiamin Quan: City University of New York
Enrique Mejia: City University of New York
Takashi Taniguchi: National Institute for Materials Science
Kenji Watanabe: National Institute for Materials Science
Andrea Alù: City University of New York
Gabriele Grosso: City University of New York

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract The growing field of quantum information technology requires propagation of information over long distances with efficient readout mechanisms. Excitonic quantum fluids have emerged as a powerful platform for this task due to their straightforward electro-optical conversion. In two-dimensional transition metal dichalcogenides, the coupling between spin and valley provides exciting opportunities for harnessing, manipulating, and storing bits of information. However, the large inhomogeneity of single layers cannot be overcome by the properties of bright excitons, hindering spin-valley transport. Nonetheless, the rich band structure supports dark excitonic states with strong binding energy and longer lifetime, ideally suited for long-range transport. Here we show that dark excitons can diffuse over several micrometers and prove that this repulsion-driven propagation is robust across non-uniform samples. The long-range propagation of dark states with an optical readout mediated by chiral phonons provides a new concept of excitonic devices for applications in both classical and quantum information technology.

Date: 2023
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DOI: 10.1038/s41467-023-39339-y

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