Anomalous dispersion and negative-mass dynamics of exciton polaritons in an atomically thin semiconductor

Effective dissipative light-matter coupling in nonideal cavities

“…We demonstrate that this situation gives rise to an effective dissipative coupling between the cavity mode and the exciton which can lead to level attraction. In particular, this effect provides a plausible and simple explanation for recent photoluminescence measurements in planar semiconductor microcavities which reported anomalous dispersion relations [29,30] or earlier reports of level attraction in quantum dot cavities [31][32][33]. We also note that similar level attraction phenomena have been recently reported in cavity magnonic systems [34,35].…”

“…The dispersion displayed in panel (b) resembles that reported in Ref. [30], in which the inverted parabolic behavior of the lower line was observed at k = 0. We note that the power spectrum calculated here is not strictly equivalent to an experimental photoluminescence spectrum, as in such measurements some relaxation and partial thermalization take place which tends to favor the occupation of the lower energy states.…”

“…-In the limit of negligible Rabi coupling, the argument of the square root can give rise to level attraction when δ k = 0 and γ C k ∼ γ X k . In particular, this effect provides a plausible and relatively simple explanation for recent puzzling photoluminescence measurements in semiconductor cavities which reported anomalous level attraction [29][30][31][32][33]. In the opposite limit of strong Rabi coupling, g R γ C k , γ X k , δ k , the argument of the square root in Eq.…”