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Nonparabolicity effects and the spin-split electron dwell time in symmetric III-V double-barrier structures

Isic, G., Milanovic, V., Radovanovic, J., Indjin, D., Ikonic, Z. and Harrison, P. (2009) Nonparabolicity effects and the spin-split electron dwell time in symmetric III-V double-barrier structures. Microelectronics Journal, 40 (3). pp. 611-614. ISSN 0026-2692

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Abstract

We start from the fourth order nonparabolic and anisotropic conduction band bulk dispersion relation to obtain an one-band effective Hamiltonian which we apply to an AlGaSb symmetric double-barrier structure with resonant energies significantly (more than 200meV) above the well bottom. The spin-splitting is described by the k3 Dresselhaus spin-orbit coupling term modifying only the effective mass of the spin eigenstates in the investigated structure. Apart from the bulk-like resonant energy shift due to the band nonparabolicity, we obtain a substantial shift depending on the choice of boundary conditions for the envelope functions at interfaces between different materials. The shift of resonant energy levels leads to the change of spin-splitting and the magnitude of the dwell times. We attempt to explain the influence of both the nonparabolicity and boundary conditions choice by introducing various effective masses.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2008 Elsevier Ltd. This is an author produced version of a paper accepted for publication in 'Microelectronics Journal'. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: quantum wells, dwell time, nonparabolicity, spin-orbit coupling
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Institute of Microwaves and Photonics (Leeds)
Depositing User: Mr Goran Isic
Date Deposited: 04 Mar 2009 17:14
Last Modified: 08 Feb 2013 17:06
Published Version: http://dx.doi.org/10.1016/j.mejo.2008.06.032
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.mejo.2008.06.032
URI: http://eprints.whiterose.ac.uk/id/eprint/7928

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