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 nonequilibrium Green functions, reflect the hot-phonon-induced change in the spectrum and population of the impurity state. The induced change of the $I-V$ characteristics has a typical two-peak form, which for larger populations of the level becomes distorted by increased intralevel phonon emissions. A qualitative agreement with experiments is obtained.