Figure 3: Photoinduced emission—temperature dependence.

Emission spectra corresponding to radiative recombination of electrons below the Fermi level with heavy holes measured in the temperature range T=0.5–1.5 K at fixed photoexcitation power P=32 mW cm⁻². At elevated temperatures a single optical transition in σ⁺ polarization (A) is seen. The B line observed at low temperatures is a CME signature. The bottom diagram demonstrates optical transitions between the single-particle states in two possible polarizations of the emitted photons. The top diagram shows expected optical transitions in σ⁺ polarization in the presence of a CME ensemble.