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

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Isic, G. ; Milanovic, V. ; Radovanovic, J. ; Indjin, D. ; Ikonic, Z. ; Harrison, P. (2009)
  • Publisher: Elsevier
  • Subject:
    arxiv: Condensed Matter::Mesoscopic Systems and Quantum Hall Effect

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.\ud
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