Fig. 3: Formation of topological polaritonic bands and edge states with the onset of strong coupling with MoSe2 exciton. | Nature Communications

Fig. 3: Formation of topological polaritonic bands and edge states with the onset of strong coupling with MoSe2 exciton.

From: Experimental observation of topological Z2 exciton-polaritons in transition metal dichalcogenide monolayers

Fig. 3

Normalized angle-resolved differential reflectivity measured in the vicinity of two domain walls of a metasurface for transverse magnetic (TM) polarization. The map at the domain wall covered only with hBN (a) represents purely photonic scenario, while at the domain wall with MoSe2/hBN heterostructure (b), TPs are formed due to onset of strong coupling regime at 7 K. The spectral position of MoSe2 exciton (1.65 eV) is marked with horizontal dashed line. c Cross-polarized reflectivity (TM excitation, transverse electric (TE) detection, circularly polarized reflectivity (CPR)) maps in logarithmic scale revealing the modification of the edge state dispersion between photonic (left) and topological polaritonic (right) regimes. d Dispersion of the edge modes extracted from cross-polarized reflectivity maps for photonic edge state (red dots) and at 7 K in strong coupling regime (polaritonic edge state, blue dots) compared with the edge state dispersion calculated with tight binding model with and without coupling to the exciton (blue and red lines, respectively).

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