EMISSION AND ABSORPTION OF CONFINED AND INTERFACE OPTICAL PHONONS BY ELECTRONS IN THE NONLINEAR TRANSPORT REGIME OF A PARABOLIC QUANTUM-WIRE

Citation
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
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
0953-8984
Volume
10
Issue
17
Year of publication
1998
Pages
3743 - 3753
Database
ISI
SICI code
0953-8984(1998)10:17<3743:EAAOCA>2.0.ZU;2-9
Abstract
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.