Bound states, electron localization and spin correlations in low-dimensional GaAs/AlGaAs quantum constrictions
2013 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 25, no 7, 072201- p.Article in journal (Refereed) Published
We analyze the occurrence of local magnetization and the effects of electron localization in different models of quantum point contacts (QPCs) using spin-relaxed density functional theory (DFT/LSDA) by means of numerical simulations. In the case of soft confinement potentials the degree of localization is weak and we therefore observe only traces of partial electron localization in the middle of the QPC. In the pinch-off regime there is, however, distinct accumulation at the QPC edges. At the other end, strong confinement potential, low-electron density in the leads and top or implant gates favor electron localization. In such cases one may create a variety of electron configurations from a single localized electron to more complex structures with multiple rows and Wigner lattices.
Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2013. Vol. 25, no 7, 072201- p.
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:liu:diva-87711DOI: 10.1088/0953-8984/25/7/072201ISI: 000314214200001OAI: oai:DiVA.org:liu-87711DiVA: diva2:599889