Quantum wires in magnetic field: a comparative study of the Hartree-Fock and the spin density functional approaches
2008 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, Vol. 20, no 33Article in journal (Refereed) Published
We present a detailed comparison of the self-consistent calculations based on the Hartree-Fock and the spin density functional theory for a split-gate quantum wire in the IQH regime. We demonstrate that both approaches provide qualitatively (and, in most cases, quantitatively) similar results for the spin-resolved electron density, spin polarization, spatial spin separation at the edges and the effective g factor. Both approaches produce the same values of the magnetic fields corresponding to the successive subband depopulation and qualitatively similar evolution of the magnetosubbands. Quantitatively, however, the HF and the DFT subbands are different (even though the corresponding total electron densities are practically the same). In contrast to the HF approach, the DFT calculations predict much larger spatial spin separation near the wire edge for the low magnetic fields (when the compressible strips for spinless electrons are not formed yet). In the opposite limit of the large fields, the Hartree-Fock and the DFT approaches give very similar values for the spatial spin separation.
Place, publisher, year, edition, pages
2008. Vol. 20, no 33
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-45871DOI: 10.1088/0953-8984/20/33/335233OAI: oai:DiVA.org:liu-45871DiVA: diva2:266767