Condensed Matter > Mesoscale and Nanoscale Physics
[Submitted on 16 May 2016 (v1), last revised 30 Aug 2016 (this version, v2)]
Title:Room-temperature exciton-polaritons with two-dimensional WS2
View PDFAbstract:Two-dimensional transition metal dichalcogenides exhibit strong optical transitions with significant potential for optoelectronic devices. In particular they are suited for cavity quantum electrodynamics in which strong coupling leads to polariton formation as a root to realisation of inversionless lasing, polariton condensationand superfluidity. Demonstrations of such strongly correlated phenomena to date have often relied on cryogenic temperatures, high excitation densities and were frequently impaired by strong material disorder. At room-temperature, experiments approaching the strong coupling regime with transition metal dichalcogenides have been reported, but well resolved exciton-polaritons have yet to be achieved. Here we report a study of monolayer WS$_2$ coupled to an open Fabry-Perot cavity at room-temperature, in which polariton eigenstates are unambiguously displayed. In-situ tunability of the cavity length results in a maximal Rabi splitting of $\hbar \Omega_{\rm{Rabi}} = 70$ meV, exceeding the exciton linewidth. Our data are well described by a transfer matrix model appropriate for the large linewidth regime. This work provides a platform towards observing strongly correlated polariton phenomena in compact photonic devices for ambient temperature applications.
Submission history
From: Lucas Flatten [view email][v1] Mon, 16 May 2016 12:13:00 UTC (2,916 KB)
[v2] Tue, 30 Aug 2016 12:47:44 UTC (1,292 KB)
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