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Paper   IPM / Physic / 7194
School of Physics
  Title:   Spin Polarization in A Two-Dimensional Electron Gas
1.  B. Davoudi
2.  M.P. Tosi
  Status:   Preprint
  No.:  0
  Year:  2001
  Supported by:  IPM
We evaluate the charge and longitudinal spin response functions of a two-dimensional electron gas with e2/r interactions in an arbitrary state of spin polarization, using a structurally self-consistent approach to treat exchange and correlations. From the results we assess the nature of the magnetic order in the electronic ground state in zero magnetic field as a function of electron density. We find that states of partial spin polarization are thermodynamically unstable at all values of the coupling strength and that a first-order phase transition occurs with increasing coupling strength from the magnetically disorderd (paramagnetic) phase to the fully spin-polarized (ferromagnetic) phase. This behavior is in qualitative agreement with diffusion Monte Carlo data, although the location of the phase transition is underestimated in our calculations.

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