Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-03-08
Phys. Lett. A372, 2322 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 3 figures
Scientific paper
10.1016/j.physleta.2007.11.043
By means of the density matrix renormalization group (DMRG) method, the static spin structure factors and the magnetization plateaus of the trimerized Heisenberg ferromagnet-ferromagnet-antiferromagnet and antiferromagnet-antiferromagnet-ferromagnet spin chains in the presence of a magnetic field are elaborately studied. It is found that in the plateau states, the static structure factor with three peaks does not vary with the external magnetic field as well as the exchange couplings; the spin correlation function behaves as a perfect sequence and has a simple relation with the magnetization per site. An approximate wave function for the plateau states is proposed, and a picture based on the valence-bond-solid states is presented in order to understand the origin and the total number of the magnetization plateaus, which are shown to be in agreement with the DMRG results.
Gong Shou-Shu
Gu Bo
Su Gang
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