Abstract
We have used pulses of nonequilibrium phonons to probe the electron-phonon interaction in a ballistic quantum wire. Phonons incident on the wire caused a decrease in its conductance, $\ensuremath{-}\ensuremath{\Delta}G,$ due to phonon-induced electron backscattering. We observed giant oscillations in $\ensuremath{-}\ensuremath{\Delta}G$ as the wire was narrowed. Maxima occurred when ${E}_{F}$ was close to the bottom of any one-dimensional subband. An applied magnetic field broadened and shifted the phonoconductivity oscillations, due to the depopulation of the hybrid electric-magnetic subbands. When the wire was just pinched off, the phonons caused a strong increase in the conductivity due to phonon-assisted transfer of electrons across the potential barrier.
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