Elimination of carrier-density nonuniformities by surface acoustic waves

Citation
Y. Takagaki et al., Elimination of carrier-density nonuniformities by surface acoustic waves, APPL PHYS L, 76(16), 2000, pp. 2259-2261
Citations number
10
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
00036951 → ACNP
Volume
76
Issue
16
Year of publication
2000
Pages
2259 - 2261
Database
ISI
SICI code
0003-6951(20000417)76:16<2259:EOCNBS>2.0.ZU;2-5
Abstract
The action on a two-dimensional electron gas (2DEG) by electric fields that accompany surface acoustics waves (SAWs) propagating in GaAs-AlxGa1-xAs he terostructures is typically negligible because of screening. In the quantum Hall regime, the longitudinal conductivity of the 2DEG is nearly zero when the Fermi level lies in the Landau gap. Consequently, the SAWs can build u p electric fields that are strong enough to rake off mobile electrons. We d emonstrate that inhomogeneous carrier distributions produced in the course of photoionization of DX centers can be flattened out by applying the SAWs in high magnetic fields. (C) 2000 American Institute of Physics. [S0003-695 1(00)01816-7].