Zero- and one-dimensional magnetic traps for quasi-particles

Abstract

We investigate the possibility of trapping quasi-particles possessing spin degree of freedom in hybrid structures. The hybrid system we are considering here is composed of a semi-magnetic quantum well placed a few nanometers below a ferromagnetic micromagnet. We are interested in two different micromagnet shapes: cylindrical (micro-disk) and rectangular geometry. We show that in the case of a micro-disk, the spin object is localized in all three directions and therefore zero-dimensional states are created, and in the case of an elongated rectangular micromagnet, the quasi-particles can move freely in one direction, hence one-dimensional states are formed. After calculating profiles of the magnetic field produced by the micromagnets, we analyze in detail the possible light absorption spectrum for different micromagnet thicknesses, and different distances between the micromagnet and the semimagnetic quantum well. We find that the discrete spectrum of the localized states can be detected via spatially-resolved low temperature optical measurement.

15 pages, 9 figures

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• Theory of Magnetic Anisotropy in III_{1-x}Mn_{x}V Ferromagnets
• Manipulating spin and charge in magnetic semiconductors usingsuperconducting vortices
• Nanoscale Zeeman localization of charge carriers in diluted magnetic semiconductor-permalloy hybrids
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Cited by in corpus (4)

• Stray-field-induced modification of coherent spin dynamics
• The effect of the Abrikosov vortex phase on spin and charge states in magnetic semiconductor-superconductor hybrids
• Solid-state magnetic traps and lattices
• The effect of impurities on spin polarized Zeeman bound states in dilute magnetic semiconductor-superconductor hybrids