Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-04-23
J.Phys.:Condens. Matter 23, 246002 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
19 pages, 9 figures, Accepted by Journal of Phys.: Condens. Matter
Scientific paper
The effects of a magnetic field ($h$) and a space modulation ($\delta$) on the magnetic properties of a one dimensional antiferromagnetic-ferromagnetic Heisenberg spin-1/2 model have been studied by means of numerical exact diagonalization of finite size systems, nonlinear sigma model and bosonization approach. The space modulation is considered on the antiferromagnetic couplings. At $\delta=0$, the model is mapped to a gapless L\"{u}ttinger liquid phase by increasing the magnetic field. However, the space modulation induces a new gap in the spectrum of the system and the system experiences different quantum phases which are separated by four critical fields. By opening the new gap a magnetization plateau appears at ${1/2}M_{sat}$. The effects of the space modulation are reflected in the emergence of a plateau in other physical functions such as the F-dimer and the bond dimer order parameters, and the pair-wise entanglement.
Abouie Jahanfar
Mahdavifar Saeed
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