Numerical renormalization-group study of the correlation functions of the antiferromagnetic spin 1/2 Heisenberg chain
Fecha
1995Abstract
We use the density-matrix renormalization-group technique developed by White to calculate the spin correlation functions (S2n+I S2n)=(-1) 1 w(l,N) for isotropic Heisenberg rings up to N=70 sites. The correlation functions for large l and N are found to obey the scaling relation w(l,N) = w(l,oo)fxy(l!N) proposed by Kaplan et al., which is used to determine w(l,oo). The asymptotic correlation function w(l,oo) and the magnetic structure factor S(q=7T) show logarithmic corrections consistent with w ...
We use the density-matrix renormalization-group technique developed by White to calculate the spin correlation functions (S2n+I S2n)=(-1) 1 w(l,N) for isotropic Heisenberg rings up to N=70 sites. The correlation functions for large l and N are found to obey the scaling relation w(l,N) = w(l,oo)fxy(l!N) proposed by Kaplan et al., which is used to determine w(l,oo). The asymptotic correlation function w(l,oo) and the magnetic structure factor S(q=7T) show logarithmic corrections consistent with w(l,oo)~a-lncl /l, where c is related to the cut-off dependent coupling constant g .H( 10) = 1/ln(cl0), as predicted by field theoretical treatments. ...
En
Physical review. B, Condensed Matter. New York. Vol. 52, n. 2 (July 1995), p. r719-r722
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