Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-01-18
Phys. Rev. B 71, 024405 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 6 figures
Scientific paper
10.1103/PhysRevB.71.024405
Using the density matrix renormalization group technique, we study spin superlattices composed of a repeated pattern of two spin-1/2 XXZ chains with different anisotropy parameters. The magnetization curve can exhibit two plateaus, a non trivial plateau with the magnetization value given by the relative sizes of the sub-chains and another trivial plateau with zero magnetization. We find good agreement of the value and the width of the plateaus with the analytical results obtained previously. In the gapless regions away from the plateaus, we compare the finite-size spin gap with the predictions based on bosonization and find reasonable agreement. These results confirm the validity of the Tomonaga-Luttinger liquid superlattice description of these systems.
Miranda Eduardo
Silva-Valencia J.
Xavier J. C.
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