Fig. 4: Measured hysteresis trajectories versus OD, Ωc, and n.
From: Exceptional point and hysteresis trajectories in cold Rydberg atomic gases
a–d Measured transmission with scanning \({\Omega }_{{{{\rm{p}}}}}^{2}\) in positive (pink, up) and negative (blue, down) directions under optical densities of OD = 4.6 (a), OD = 6.8 (b), OD = 7.7 (c) and OD = 8.9 (d). The pink circle data represents the transmission when increasing \({({\Omega }_{{{{\rm{p}}}}}/2\pi )}^{2}\) from 0 MHz2 to 140.6 MHz2, and the blue circle data shows the transmission by scanning \({({\Omega }_{{{{\rm{p}}}}}/2\pi )}^{2}\) from 140.6 MHz2 to 0 MHz2 with the same sweep rate. e, f Measured transmission versus the coupling field’s Rabi frequency of Ωc = 2π × 13.3 MHz (e), Ωc = 2π × 27.8 MHz (f), Ωc = 2π × 38.6 MHz (g) and Ωc = 2π × 45.6 MHz (h). i–l Measured transmission versus the principal quantum number of n = 40 (i), n = 42 (j), n = 47 (k), n = 50 (l).
