Change search
ReferencesLink to record
Permanent link

Direct link
Quantum phase transitions in disordered dimerized quantum spin models and the Harris criterion
2010 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 82, no 17, 172409- p.Article in journal (Refereed) Published
Abstract [en]

We use quantum Monte Carlo simulations to study effects of disorder on the quantum phase transition occurring versus the ratio g = J/J' in square-lattice dimerized S = 1/2 Heisenberg antiferromagnets with intradimer and interdimer couplings J and J'. The dimers are either randomly distributed (as in the classical dimer model), or come in parallel pairs with horizontal or vertical orientation. In both cases the transition violates the Harris criterion, according to which the correlation-length exponent should satisfy v >= 1. We do not detect any deviations from the three-dimensional O(3) universality class obtaining in the absence of disorder (where v approximate to 0.71). We discuss special circumstances which allow v < 1 for the type of disorder considered here.

Place, publisher, year, edition, pages
2010. Vol. 82, no 17, 172409- p.
Keyword [en]
heisenberg-antiferromagnet, quenched disorder, critical-behavior, mott-insulator, ground-state, systems, chains
National Category
Condensed Matter Physics
URN: urn:nbn:se:kth:diva-27356DOI: 10.1103/PhysRevB.82.172409ISI: 000284397500001ScopusID: 2-s2.0-78649661105OAI: diva2:377572
QC 20101214Available from: 2010-12-14 Created: 2010-12-13 Last updated: 2010-12-14Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus
In the same journal
Physical Review B. Condensed Matter and Materials Physics
Condensed Matter Physics

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 14 hits
ReferencesLink to record
Permanent link

Direct link