Collective excitations in spontaneously spin-polarized phases of semiconductor double-quantum-well systems

F. A. Reboredo, P. G. Bolcatto, C. R. Proetto

Research output: Contribution to journalArticlepeer-review

Abstract

The intersubband collective modes of the spontaneously spin-polarized phases of semiconductor double-quantum-well systems have been analyzed, generalizing the time-dependent local-spin-density approximation for a consistent treatment of exchange-correlation effects in spin-polarized phases. Abrupt changes in the charge- and spin-density-related collective modes are found as the system passes from unpolarized to polarized ground states through first-order transitions. Excellent agreement with available experimental data is found if the tunneling-induced gap is considered as an adjustable parameter. A suggestion is made that for a tunneling-induced gap of about 0.35 meV the polarized phases should be observable at experimentally accessible densities.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number7
DOIs
StatePublished - Feb 19 2003
Externally publishedYes

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