Ground state of the random-bond spin-1 Heisenberg chain
2002 (English)In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 66, 134407-1-134407-9 p.Article in journal (Refereed) Published
Stochastic series expansion quantum Monte Carlo is used to study the ground state of the antiferromagnetic spin-1 Heisenberg chain with bond disorder. Typical spin- and string-correlation functions behave in accordance with real-space renormalization group predictions for the random-singlet phase. The average string-correlation function decays algebraically with an exponent of -0.378(6), in very good agreement with the prediction of -(3-root5)/2similar or equal to-0.382, while the average spin-correlation function is found to decay with an exponent of about -1, quite different from the expected value of -2. By implementing the concept of directed loops for the spin-1 chain we show that autocorrelation times can be reduced by up to two orders of magnitude.
Place, publisher, year, edition, pages
2002. Vol. 66, 134407-1-134407-9 p.
MATRIX RENORMALIZATION-GROUP; QUANTUM MONTE-CARLO; MODEL; PHASE; FIELD
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:kth:diva-6795DOI: 10.1103/PhysRevB.66.134407ISI: 000179067900072OAI: oai:DiVA.org:kth-6795DiVA: diva2:11606
QC 201006282007-02-202007-02-202012-01-19Bibliographically approved