Electron–electron interaction effects in integer quantum-Hall photoluminescence

Photoluminescence in an integer quantum Hall regime 2⩽ν⩽3 is studied using a numerical diagonalization method. The spectra for left circularly polarized light show a double-peak structure while those for right circularly polarized light show a single-peak structure. The characteristic double-peak structure appears due to coupling with inter-Landau-level excitations of electrons with a different spin.