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Quenching of compressible edge states around antidots
Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
ITN Linköpings universitet.
2006 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 74, no 20, 201303- p.Article in journal (Refereed) Published
Abstract [en]

We provide a systematic quantitative description of the edge state structure around a quantum antidot in the integer quantum Hall regime. The calculations for spinless electrons within the Hartree approximation reveal that the widely used Chklovskii electrostatic description [Phys. Rev. B 46, 4026 (1992)] greatly overestimates the widths of the compressible strips, the difference between these approaches diminishes as the size of the antidot increases. By including spin effects within density functional theory in the local spin-density approximation, we demonstrate that the exchange interaction can suppress the formation of compressible strips and lead to a spatial separation between the spin-up and spin-down states. As the magnetic field increases, the outermost compressible strip related to spin-down states starts to form. However, in striking contrast to quantum wires, the innermost compressible strip (due to spin-up states) never develops for antidots. © 2006 The American Physical Society.

Place, publisher, year, edition, pages
2006. Vol. 74, no 20, 201303- p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-36003DOI: 10.1103/PhysRevB.74.201303Local ID: 29329OAI: diva2:256851
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2013-11-15

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Zozoulenko, Igor
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The Institute of TechnologyDepartment of Science and Technology
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