scholarly journals Density-matrix renormalization-group study ofS=1/2 Heisenberg spin chains: Friedel oscillations and marginal system-size effects

1996 ◽  
Vol 54 (14) ◽  
pp. 9854-9861 ◽  
Author(s):  
Tai-Kai Ng ◽  
Shaojin Qin ◽  
Zhao-Bin Su
Keyword(s):  
Renormalization Group ◽  
Density Matrix ◽  
Size Effects ◽  
System Size ◽  
Spin Chains ◽  
Density Matrix Renormalization Group ◽  
Heisenberg Spin ◽  
Friedel Oscillations ◽  
Density Matrix Renormalization ◽  
Heisenberg Spin Chains

RENORMALIZATION-GROUP INVESTIGATION OF THE S = 1 RANDOM ANTIFERROMAGNETIC HEISENBERG CHAIN

2006 ◽  
Vol 17 (12) ◽  
pp. 1739-1753 ◽  
Author(s):  
PÉTER LAJKÓ
Keyword(s):  
Phase Diagram ◽  
Renormalization Group ◽  
Density Matrix ◽  
Energy Scale ◽  
Quantum Spin ◽  
Spin Chains ◽  
Density Matrix Renormalization Group ◽  
Heisenberg Chain ◽  
Quantum Spin Chains ◽  
Density Matrix Renormalization

We introduce variants of the Ma-Dasgupta renormalization-group (RG) approach for random quantum spin chains, in which the energy-scale is reduced by decimation built on either perturbative or non-perturbative principles. In one non-perturbative version of the method, we require the exact invariance of the lowest gaps, while in a second class of perturbative Ma-Dasgupta techniques, different decimation rules are utilized. For the S = 1 random antiferromagnetic Heisenberg chain, both type of methods provide the same type of disorder dependent phase diagram, which is in agreement with density-matrix renormalization-group calculations and previous studies.

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