Xf. Wang et al., EMISSION AND ABSORPTION OF CONFINED AND INTERFACE OPTICAL PHONONS BY ELECTRONS IN THE NONLINEAR TRANSPORT REGIME OF A PARABOLIC QUANTUM-WIRE, Journal of physics. Condensed matter, 10(17), 1998, pp. 3743-3753
We present a detailed study of dissipation by electrons in the non-lin
ear transport regime of harmonically confined quantum wires in GaAs/Al
As structures through emission and absorption of confined and interfac
e optical phonons. An applied magnetic field perpendicular to the inte
rfaces is used to modulate the natural harmonic frequencies in order t
o explore situations in and off resonance with the vibrational modes.
Our results show that electrons absorb both confined phonons and inter
face phonons over wide angles and backwards, at low drift velocities.
The emission occurs both forwards and backwards and dominates entirely
for high drift velocities. The confined phonons play the dominant rol
e in the dissipation, even for quantum wires inside thin quantum wells
and with a magnetic field strength selected to make the harmonic leve
ls in resonance with the AlAs-like interface mode.