Symmetries in the collective excitations of an electron gas in core-shell nanowires
comunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7013
comunitat-uji-handle3:10234/8638
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INVESTIGACIONMetadatos
Título
Symmetries in the collective excitations of an electron gas in core-shell nanowiresFecha de publicación
2014Editor
American Physical SocietyISSN
1098-0121; 1550-235XTipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://journals.aps.org/prb/pdf/10.1103/PhysRevB.89.155416Versión
info:eu-repo/semantics/publishedVersionResumen
We study the collective excitations and inelastic light-scattering cross section of an electron gas confined
in a GaAs/AlGaAs coaxial quantum well. These systems can be engineered in a core-multishell nanowire
and ... [+]
We study the collective excitations and inelastic light-scattering cross section of an electron gas confined
in a GaAs/AlGaAs coaxial quantum well. These systems can be engineered in a core-multishell nanowire
and inherit the hexagonal symmetry of the underlying nanowire substrate. As a result, the electron gas forms
both quasi-one-dimensional channels and quasi-two-dimensional channels at the quantum-well bents and facets,
respectively. Calculations are performed within the random-phase approximation and time-dependent density
functional theory approaches. We derive symmetry arguments which allow one to enumerate and classify charge
and spin excitations and determine whether excitations may survive to Landau damping. We also derive inelastic
light-scattering selection rules for different scattering geometries. Computational issues stemming from the need
to use a symmetry-compliant grid are also investigated systematically. [-]
Publicado en
PHYSICAL REVIEW B 89, 155416 (2014)Derechos de acceso
©2014 American Physical Society
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