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Density-matrix renormalization-group analysis of the spin-1/2 XXZ chain in an XY symmetric random magnetic field
KTH, Superseded Departments, Physics.ORCID iD: 0000-0002-2076-5911
2003 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 67, no 10Article in journal (Refereed) Published
Abstract [en]

The spin-1/2 XXZ chain in a random magnetic field pointing in the Z direction is numerically studied using the density-matrix renormalization-group method. The phase diagram as a function of the anisotropy of the XXZ Hamiltonian and the strength of the random field is analyzed by computing the spin correlations and the superfluid density. To obtain the superfluid density we consider a superblock configuration representing a closed system with an arbitrary twist at the boundary. This allows us to estimate the size of the critical region where the quasi-long-range order persists, that is, where the spin correlation length is infinite and the superfluid density is nonzero.

Place, publisher, year, edition, pages
2003. Vol. 67, no 10
Keyword [en]
dimensional quantum fluids, heisenberg chain, localization, model
URN: urn:nbn:se:kth:diva-22395DOI: 10.1103/PhysRevB.67.104406ISI: 000182033700045OAI: diva2:341093
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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