Figure 1
From: Polarimetry of photon echo on charged and neutral excitons in semiconductor quantum wells
Typical schemes of energy levels and allowed optical transitions in direct band-gap semiconductor structures: For the trion/D0X (a) and the exciton (b). Small thin and thick arrows indicate the spin projections of electrons and holes, respectively; numbers in brackets correspond to the total angular momentum projection values. (c) Temporal sequence of the optical excitation pulses used in the model. (d) Main used polarization directions of excitation pulses and detection: Angle φj = 0°, 90°, 45°, and 135°(j = 1, 2, d) for horizontal (H), vertical (V), diagonal (D), and anti-diagonal (A) polarizations, respectively.
