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Author Tifrea, I. ♦ Marinescu, D. C.
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ♦ ACOUSTICS ♦ COLLECTIVE EXCITATIONS ♦ ELECTRONS ♦ MAGNETIC FIELDS ♦ MAGNETIC SEMICONDUCTORS ♦ MAGNETOACOUSTICS ♦ OSCILLATIONS ♦ PLASMONS ♦ RESPONSE FUNCTIONS ♦ SPIN
Abstract We investigate the charge and spin response functions of a bilayer quasi-two-dimensional system, spin polarized by a constant magnetic field {rvec B}. Terms beyond the random-phase approximation, the exchange and correlation interactions, are introduced by using generalized spin-dependent local field factors, G{sub {sigma}}{sup x,c}({rvec q},{omega}). The self-consistent magnetic interaction among the electron spins determines the coupling of the charge and the longitudinal spin-density excitations, leading to coupled in-phase and out-of-phase electric and magnetic modes. We find that the lowest frequency belongs to an acoustic mode, that represents the out-of-phase oscillation of the longitudinal magnetizations in the two layers. This collective excitation is shown to become important in the case of materials with large gyromagnetic factors, such as dilute magnetic semiconductors.
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-08-15
Publisher Place United States
Journal Physical Review B
Volume Number 64
Issue Number 7


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