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
comunitat-uji-handle4:
INVESTIGACIONMetadata
Title
Symmetries in the collective excitations of an electron gas in core-shell nanowiresDate
2014Publisher
American Physical SocietyISSN
1098-0121; 1550-235XType
info:eu-repo/semantics/articlePublisher version
http://journals.aps.org/prb/pdf/10.1103/PhysRevB.89.155416Version
info:eu-repo/semantics/publishedVersionAbstract
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. [-]
Is part of
PHYSICAL REVIEW B 89, 155416 (2014)Rights
©2014 American Physical Society
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info:eu-repo/semantics/openAccess
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