Collective modes of a bilayer quasi-two-dimensional spin polarized electron gas

✍ Scribed by I. Ţifrea; D.C. Marinescu

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 123 KB
• Volume: 15
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(02)00441-1

✦ Synopsis

In the presence of a weak electromagnetic perturbation, it is shown that a bilayer quasi-two-dimensional spin polarized system exhibits coupled in-phase and out-of-phase charge and spin density resonant excitations. These modes occur when either the self-consistent magnetization or Coulomb interaction e ects beyond the random phase approximation are considered. The latter are introduced by means of spin-dependent local ÿeld corrections for exchange (x) and correlation (c); G x(c) (q; w). We analyze both intra-and inter-subband excitations and provide analytic results for their excitation frequencies in the long wavelength limit.