Abstract
We report new fundamental results on carrier transport in quantum wire structures. In the extreme quantum limit, “low” field transport characteristics show mobility enhancement associated with anomalous carrier cooling due to quenching of electron-electron interaction and strong optic phonon dissipation. In condition of resonance between the optic phonon energy and the electronic subband separation, a substantial population inversion between adjacent off-resonance subbands arises as a natural consequence of optic phonon absorption in confined ID systems. Radiative far infra-red emission induced by this new “phonon pumping” mechanism are subject to selection rules but theoretical estimations of the gain coefficient for stimulated emission are encouraging. In high field transport, simulation shows rapid carrier escape from quantum wires caused by intervalley scattering and real space transfer.
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