Publications (2)0 Total impact
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ABSTRACT: We discuss numerical results for the 1 — D spin 1/2 antiferromagnetic Heisenberg model with next-to-nearest neighbour coupling in the presence of a uniform magnetic
field. The model develops zero frequency excitations at field-dependent soft-mode momenta. We compute critical quantities
from finite size dependence of static structure factors.
05/2007: pages 41-61;
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ABSTRACT: We investigate the critical exponents $\eta_3(\alpha,M), \eta_1(\alpha,M)$ associated with the singularities in the longitudinal and transverse structure factors of the one dimensional antiferromagnetic Heisenberg model with nearest (J_1) and next to nearest (J_2) neighbour coupling of relative strength $\alpha = {J_2}/{J_1}$ and an external field $B$ with magnetization $M(B)$. Comment: LaTeX file (text) + 7 PS files (figures)
02/1999;
Institutions
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1999–2007
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University Laval
Québec,
Quebec,
Canada