Landau levels, edge states and magneto-conductance in GaAs/AlGaAs core-shell nanowires

Abstract

Magnetic states of the electron gas confined in modulation-doped core-shell nanowires are calculated for a transverse field of arbitrary strength and orientation. Magneto-conductance is predicted within the Landauer approach. The modeling takes fully into account the radial material modulation, the prismatic symmetry and the doping profile of realistic GaAs/AlGaAs devices within an envelope-function approach, and electron-electron interaction is included in a mean-field self-consistent approach. Calculations show that in the low free-carrier density regime, magnetic states can be described in terms of Landau levels and edge states, similar to planar two-dimensional electron gases in a Hall bar. However, at higher carrier density the dominating electron-electron interaction leads to a strongly inhomogeneous localization at the prismatic heterointerface. This gives rise to a complex band dispersion, with local minima at finite values of the longitudinal wave vector, and a region of negative magneto-resistance. The predicted marked anisotropy of the magneto-conductance with field direction is a direct probe of the inhomogeneous electron gas localization of the conductive channel induced by the prismatic geometry.

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Cited by in corpus (18)

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• Electron localization and optical absorption of polygonal quantum rings
• Aharonov-Bohm oscillations and electron gas transitions in hexagonal core-shell nanowires with an axial magnetic field
• Schottky barrier and contact resistance of InSb nanowire field effect transistors
• Signature of snaking states in the conductance of core-shell nanowires
• Snaking states on a cylindrical surface in a perpendicular magnetic field
• Magneto-transport Subbands Spectroscopy in InAs Nanowires
• Conductance features of core-shell nanowires determined by the internal geometry
• Conductance oscillations of core-shell nanowires in transversal magnetic fields
• Anisotropy of the spin-orbit coupling driven by a magnetic field in InAs nanowires
• Ballistic Anisotropic Magnetoresistance in Core Shell Nanowires and Rolled-up Nanotubes
• In-gap corner states in core-shell polygonal quantum rings
• Band structure of n- and p-doped core-shell nanowires
• Magneto-photoluminescence in GaAs/AlAs core-multishell nanowires: a theoretical investigation
• Tailoring the core electron density in modulation-doped Core-Multi-Shell nanowires
• Electromagnetic field emitted by core-shell semiconductor nanowires driven by an alternating current
• Symmetry dependent electron localization and optical absorption of polygonal quantum rings