HOT-PHONON-ASSISTED RESONANT-TUNNELING IN A QUANTUM-WELL

We theoretically investigate dc electron resonant tunneling through an impurity state in a quantum well assisted by hot acoustical phonons. Numerical results for the tunneling current, obtained by nonequilibriu m Green functions, reflect the hot-phonon-induced change in the spectr um and population of the impurity state. The induced change of the I-V characteristics has a typical two-peak form, which for larger populat ions of the level becomes distorted by increased intralevel photon emi ssions. A qualitative agreement with experiments is obtained.