Interband Resonant Polarons in the Semimagnetic Zero-Gap SemiconductorHg1−xMnxTe

Resonant two-mode polarons due to phonon-induced electron transitions between the conduction band and the heavy-hole valence band are considered and shown to describe well the observed effect in the zero-gap semimagnetic semiconductor ${\mathrm{Hg}}_{0.95}$ ${\mathrm{Mn}}_{0.05}$Te. It is demonstrated that the interband electron-phonon interaction provides unique possibilities to investigate an involved structure of the Landau-Luttinger magnetic subbands in zero-gap materials.