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Collective Excitations in an Asymmetrically Spin-Polarized Quantum Well
Physical Review B
  • D C Marinescu, Clemson University
  • J J Quinn, University of Tennessee
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The American Physical Society
We present a phenomenological picture for the many-body excitations of a two-dimensional electron gas in a quantum well spin polarized by a dc magnetic field at an angle ␪ with the axis of the well. In the framework of the Landau theory of charged Fermi liquids, we determine the frequencies of collective modes by solving a transport equation for quasiparticles in the local electromagnetic field associated with the charge- and spin-density fluctuations. In the long-wavelength limit, analytic solutions for ␻(qជ) are obtained as functions of the degree of spin polarization and of the angle ␪.
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