Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00228 : Description of a primitive valley scattering unit cell to understand anisotropic inter-valley scattering in AlAs quantum wells
Author:
Valley degenerate systems have an extra scattering channel not
present in single valley systems,
namely inter-valley scattering. To help classify anisotropic
inter-valley scattering in degenerate
multi-valley systems, such as AlAs quantum wells (QWs), we define
a valley scattering primitive
unit cell in momentum space which allows one to distinguish
purely in-plane momentum scattering
from scattering requiring an out-of-plane momentum component. The
standard depiction of a
2D Brillouin zone of a quantum confined valley-degenerate system
projects all valleys to a single
plane and this depiction loses information about the momentum
scattering component that
was projected out. Because QW confinement potentials are
inherently anisotropic, the disorder
potential characteristic of quantum confinement can create
anisotropic short-wavelength inter-
valley scattering potentials favoring in-plane momentum
scattering. We demonstrate that
the valley scattering cell for AlAs QWs grown along various
orientations is particularly useful in
identifying relevant scattering vectors. Initial estimates will
be shown of the role of
strong electron-electron interactions in AlAs QWs on inter-valley
scattering parameters such as
inter-valley scattering time, probabilities and rates.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.228
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