Magnetic states in prismatic core multishell nanowires

Details Magnetic states in prismatic core multishell nanowires Magnetic states in prismatic core multishell nanowires

2009-03-26

arxiv.org/abs/0903.4618v1

Nano Letters 9, 1631 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 4 figures, To be published in Nano Letters

Scientific paper

10.1021/nl803942p

We study the electronic states of core multi-shell semiconductor nanowires, including the effect of strong magnetic fields. We show that the multi-shell overgrowth of a free-standing nanowire, together with the prismatic symmetry of the substrate, may induce quantum confinement of carriers in a set of quasi-1D quantum channels corresponding to the nanowire edges. Localization and inter-channel tunnel coupling are controlled by the curvature at the edges and the diameter of the underlying nanowire. We also show that a magnetic field may induce either Aharonov-Bohm oscillations of the energy levels in the axial configuration, or a dimensional transition of the quantum states from quasi-1D to Landau levels for fields normal to the axis. Explicit predictions are given for nanostructures based on GaAs, InAs, and InGaN with different symmetries.

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