Photoluminescence spectra of the Mnd-d multiplets transitions of zinc-blende MnTe epitaxial films: laser and deuterium lamp excitation study.

The luminescences of zinc-blende MnTe epitaxial films are respectively excited by a laser and deuterium lamp to study Mnd-d multiplets transitions. Besides the inclusion of the band gap, all other excited states related to Mnd-d transitions including T4(G4), T4(G4), A4[E4(G4)], T4(D4), E4(D4), and T2(I2) are observed. The shift and broadening of the T4(G4) and T4(G4) lines with increasing temperature are described by the electron-phonon coupling. Step-like energy and intensity shifts for the A4[E4(G4)], T4(D4), E4(D4), and T2(I2) transitions occur in the vicinity of the Néel point, which can be ascribed to the different spin-ordering-induced energy relaxation in ground and excited states of Mnd-d multiplets, and these transitions show temperature independence and weak quenching.