Electron–phonon coupling in nanodevices

We study theoretically the manifestation of the nonadiabaticity of the electron–longitudinal optical (LO)-phonon small open system of a quantum dot. This nonadiabaticity has an influence on the current–voltage characteristics of the nanotransistor. The nanotransistor is represented by a semiconductor quantum dot with the attached source and the drain electrodes, together with a gate. Under a certain asymmetry of the contacts the electron–optical phonon interaction, causing the electronic states occupation upconversion, is shown to lead to a creation of a spontaneous voltage between the source and drain or, alternatively, to a spontaneous current in case when the source and the drain are shunted.