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Collective Elementary Excitations of Two-Dimensional Magnetoexcitons in the Bose-Einstein Condensation State
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
2009 (English)In: Journal of Nanoelectronics and Optoelectronics, ISSN 1555-130X, Vol. 4, no 1, 52-75 p.Article, review/survey (Refereed) Published
Abstract [en]

The collective elementary excitations of a system of two-dimensional magnetoexcitons in a state of Bose-Einstein condensation (BEC) with arbitrary wave vector was investigated in Hartree-Fock-Bogoliubov approximation. The breaking of the gauge symmetry of the Hamiltonian was introduced following the idea proposed by Bogoliubov in his theory of quasi-averages. The equations of motion were written in the frame of the starting electron and hole creation and annihilation operators. The chains of equations of motion for a set of Green's functions describing the exciton-type excitations as well as the plasmon-type excitations were deduced. Their disconnections were introduced using the perturbation theory with a small parameter of the theory proportional to the filling factor multiplied by the phase space filling factor. The energy spectrum of the collective elementary excitations is characterized by the interconnection of the exciton and plasmon branches, because the plasmon-type elementary excitations are gapless and are lying in the same spectral interval as the exciton-type elementary excitations.

Place, publisher, year, edition, pages
2009. Vol. 4, no 1, 52-75 p.
Keyword [en]
Bose-Einstein Condensation, Magnetoexciton, Collective Properties
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-142290DOI: 10.1166/jno.2009.1005ISI: 000267206200005OAI: oai:DiVA.org:uu-142290DiVA: diva2:387823
Available from: 2011-01-14 Created: 2011-01-13 Last updated: 2011-01-14Bibliographically approved

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