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Symmetry and spin polarization in single and coupled quantum dots
Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden Tech Univ, Moscow State Engn Phys Inst, Moscow 115409, Russia.
Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden Tech Univ, Moscow State Engn Phys Inst, Moscow 115409, Russia.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics .
2001 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 63, no 16, art. no.-165309 p.Article in journal (Refereed) Published
Abstract [en]

We conducted theoretical investigation into the effect of spontaneous electron spin polarization in single and coupled quantum dots formed by lateral confinement of a high-mobility two-dimensional electron gas in a semiconductor heterostructure. The equilibrium properties of realistic many-electron quantum-dot devices are first studied within the two-dimensional Thomas-Fermi approximation taking into account contributions from the patterned gate, doping, surface states, and mirror charges. In order to explore spin-dependent phenomena, a self-consistent model has been developed using the Kohn-Sham local spin-density formalism. We have tested the contribution of electron correlation in the systems considered and found that it plays a minor role, hence only exchange interactions are included in the model. We investigate the possibilities of manipulating the magnetization (spin polarization) of single and double quantum dots by means of their mutual coupling and symmetry breaking caused by variations in the geometry of the gate.

Place, publisher, year, edition, pages
2001. Vol. 63, no 16, art. no.-165309 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-49290OAI: oai:DiVA.org:liu-49290DiVA: diva2:270186
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-12

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Berggren, Karl-Fredrik

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