Spin-ordering and magnon collective modes for two-dimensional electron lattices in strong magnetic fields.
نویسندگان
چکیده
We study the spin-ordering and the magnon collective modes of the twodimensional Wigner crystal state at strong magnetic fields. Our work is based on the Hartree-Fock approximation for the ground state and the timedependent 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. PACS numbers: 73.20.Mf, 75.30.Ds, 75.30.Et Typeset using REVTEX 1
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ورودعنوان ژورنال:
- Physical review. B, Condensed matter
دوره 53 15 شماره
صفحات -
تاریخ انتشار 1996