Spin-ordering and magnon collective modes for two-dimensional electron lattices in strong magnetic fields

Details Spin-ordering and magnon collective modes for two-dimensional electron lattices in strong magnetic fields Spin-ordering and magnon collective modes for two-dimensional electron lattices in strong magnetic fields

1995-08-23

arxiv.org/abs/cond-mat/9508100v1

Physics

Condensed Matter

Revtex style, 31 pages (including 4 tables) and 4 uuencoded postscript figures in a separate file (also avalaible from R. Cote

Scientific paper

10.1103/PhysRevB.53.10019

We study the spin-ordering and the magnon collective modes of the two-dimensional Wigner crystal state at strong magnetic fields. Our work is based on the Hartree-Fock approximation for the ground state and the time-dependent Hartree-Fock approximation for the collective modes. We find that the ground state is ferromagnetic, i.e that all spins are aligned at T=0 even when the electronic g-factor is negligibly small. The magnon calculations show that the spin-stiffness is much smaller in the crystal state than in fluid states which occur at nearby Landau level filling factors.

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