HIGHLIGHTS
SUMMARY
As a consequence, at low temperatures, the luminescence of these dark materials is intrinsically quenched due to the fast relaxation of excitons into the dark ground_state, and needs to be thermally `activated`10. The spins of an electron and a hole in the ground_state (brown line) are antiparallel to each other, and direct optical excitation of this singlet configuration is forbidden in the electric dipole approximation, making the ground_state optically dark. The finite size of the flake results in the discretization of the energy levels of lower polaritons28, which yields a dispersion-less ground_state . . .
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