A detailed analysis is made of the acoustic phonon emission spectrum of a heated 2DEG in a (0 0 1) n-Si inversion layer, when a quantizing magnetic field B is applied perpendicular to the layer. Particular attention is given to the case of high magnetic fields when only a few Landau levels are occupied. The emitted power is then quasimonochromatic at the cyclotron frequency and the angular distribution shows a sharp maximum at a propagation angle ϑm to the field, given by sin ϑm m∗vs/(12eBh̷)12, where m∗ is the effective mass and vs the sound velocity. Both longitudinal and transverse modes are considered and the transition to zero field is discussed.
Phonon emission by a hot two-dimensional electron gas in a quantizing magnetic field
NEILSON, DAVID;
1987-01-01
Abstract
A detailed analysis is made of the acoustic phonon emission spectrum of a heated 2DEG in a (0 0 1) n-Si inversion layer, when a quantizing magnetic field B is applied perpendicular to the layer. Particular attention is given to the case of high magnetic fields when only a few Landau levels are occupied. The emitted power is then quasimonochromatic at the cyclotron frequency and the angular distribution shows a sharp maximum at a propagation angle ϑm to the field, given by sin ϑm m∗vs/(12eBh̷)12, where m∗ is the effective mass and vs the sound velocity. Both longitudinal and transverse modes are considered and the transition to zero field is discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
