Motional narrowing, ballistic transport, and trapping of room-temperature exciton polaritons in an atomically-thin semiconductor.

Autor: Wurdack M; ARC Centre of Excellence in Future Low-Energy Electronics Technologies and Nonlinear Physics Centre, Research School of Physics, The Australian National University, Canberra, ACT, Australia. matthias.wurdack@anu.edu.au., Estrecho E; ARC Centre of Excellence in Future Low-Energy Electronics Technologies and Nonlinear Physics Centre, Research School of Physics, The Australian National University, Canberra, ACT, Australia., Todd S; ARC Centre of Excellence in Future Low-Energy Electronics Technologies and Nonlinear Physics Centre, Research School of Physics, The Australian National University, Canberra, ACT, Australia., Yun T; ARC Centre of Excellence in Future Low-Energy Electronics Technologies and Nonlinear Physics Centre, Research School of Physics, The Australian National University, Canberra, ACT, Australia., Pieczarka M; ARC Centre of Excellence in Future Low-Energy Electronics Technologies and Nonlinear Physics Centre, Research School of Physics, The Australian National University, Canberra, ACT, Australia.; Department of Experimental Physics, Wrocław University of Science and Technology, Wrocław, Poland., Earl SK; ARC Centre of Excellence in Future Low-Energy Electronics Technologies and Centre for Quantum and Optical Science, Swinburne University of Technology, Victoria, Australia., Davis JA; ARC Centre of Excellence in Future Low-Energy Electronics Technologies and Centre for Quantum and Optical Science, Swinburne University of Technology, Victoria, Australia., Schneider C; Institut für Physik, Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany., Truscott AG; Laser Physics Centre, Research School of Physics, The Australian National University, Canberra, ACT, Australia., Ostrovskaya EA; ARC Centre of Excellence in Future Low-Energy Electronics Technologies and Nonlinear Physics Centre, Research School of Physics, The Australian National University, Canberra, ACT, Australia. elena.ostrovskaya@anu.edu.au.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2021 Sep 10; Vol. 12 (1), pp. 5366. Date of Electronic Publication: 2021 Sep 10.
DOI: 10.1038/s41467-021-25656-7
Abstrakt: Monolayer transition metal dichalcogenide crystals (TMDCs) hold great promise for semiconductor optoelectronics because their bound electron-hole pairs (excitons) are stable at room temperature and interact strongly with light. When TMDCs are embedded in an optical microcavity, excitons can hybridise with cavity photons to form exciton polaritons, which inherit useful properties from their constituents. The ability to manipulate and trap polaritons on a microchip is critical for applications. Here, we create a non-trivial potential landscape for polaritons in monolayer WS 2 , and demonstrate their trapping and ballistic propagation across tens of micrometers. We show that the effects of dielectric disorder, which restrict the diffusion of WS 2 excitons and broaden their spectral resonance, are dramatically reduced for polaritons, leading to motional narrowing and preserved partial coherence. Linewidth narrowing and coherence are further enhanced in the trap. Our results demonstrate the possibility of long-range dissipationless transport and efficient trapping of TMDC polaritons in ambient conditions.
(© 2021. The Author(s).)
Databáze: MEDLINE
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