Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-02-06
Eur. Phys. J. B 40, 201 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
Published version, 7 pages, 6 figures
Scientific paper
10.1140/epjb/e2004-00258-x
In this paper we study the localization transition induced by the disorder in random antiferromagnetic spin-1/2 chains. The results of numerical large scale computations are presented for the XX model using its free fermions representation. The scaling behavior of the spin stiffness is investigated for various disorder strengths. The disorder dependence of the localization length is studied and a comparison between numerical results and bosonization arguments is presented. A non trivial connection between localization effects and the crossover from the pure XX fixed point to the infinite randomness fixed point is pointed out.
Laflorencie Nicolas
Rieger Heiko
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