Figure 2
From: Polarimetry of photon echo on charged and neutral excitons in semiconductor quantum wells
Detection and polarimetry of photon echoes from a 20 nm CdTe/(Cd, Mg)Te single QW: (a) Photoluminescence spectrum measured at T = 1.5 K. (b) Optical scheme of PE detection. (c) PE transient detected from the trion at energy of 1.5981 eV and delay τ = 40 ps. (d,e) Polar rosette-like patterns confirming the theoretically expected behavior of the PE polarization in case of the trion (or D0X) and the exciton, respectively. (f,g) Polar rosettes of experimentally measured PEs from the D0X at 1.5972 eV, τ = 53 ps and exciton at 1.6008 eV, τ = 3.3 ps, respectively. In panels (d–g) the first pulse is H-polarized (φ1 = 0°); black solid and dashed lines correspond to the polarization of the reference pulse tilted by φd = 2φ2 and φ2, respectively; blue dotted and red dash-dotted lines correspond to the H and V polarizations of the reference pulse, respectively. The amplitude of the PE is measured in arbitrary units.
