Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-02-09
Journal of Physics: Condensed Matter 18, 1769 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
13 pages, 7 figures
Scientific paper
10.1088/0953-8984/18/5/028
Within the Hartree Fock- RPA analysis, we derive the spin wave spectrum for the weak ferromagnetic phase of the Hubbard model on the honeycomb lattice. Assuming a uniform magnetization, the polar (optical) and acoustic branches of the spin wave excitations are determined. The bipartite lattice geometry produces a q-dependent phase difference between the spin wave amplitudes on the two sub-lattices. We also find an instability of the uniform weakly magnetized configuration to a weak antiferromagnetic spiraling spin structure, in the lattice plane, with wave vector Q along the Gamma-K direction, for electron densities n>0.6. We discuss the effect of diagonal disorder on both the creation of electron bound states, enhancement of the density of states, and the possible relevance of these effects to disorder induced ferromagnetism, as observed in proton irradiated graphite.
Araujo M. A. N.
Peres Nuno. M. R.
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