scholarly journals Exact renormalization group for quantum spin systems

2019 ◽  
Vol 99 (6) ◽  
Author(s):  
Jan Krieg ◽  
Peter Kopietz
Keyword(s):  
Renormalization Group ◽  
Quantum Spin ◽  
Spin Systems ◽  
Quantum Spin Systems ◽  
Exact Renormalization Group

scholarly journals A Modified Quantum Renormalization Group for XXZ Spin Chain

1998 ◽  
Vol 12 (23) ◽  
pp. 2359-2370
Author(s):  
A. Langari ◽  
V. Karimipour
Keyword(s):  
Renormalization Group ◽  
Ground State ◽  
State Energy ◽  
Spin Correlation ◽  
Quantum Spin ◽  
Spin Systems ◽  
Heisenberg Chain ◽  
Quantum Spin Systems ◽  
Xxz Model ◽  
Simple Modification

A simple modification of the standard Renormalization Group (RG) technique for the study of quantum spin systems is introduced. Our method which takes into account the effect of boundary conditions by employing the concept of superblock, may be regarded as a simple way for obtaining first estimates of many properties of spin systems. By applying this method to the XXZ spin-[Formula: see text] Heisenberg chain, we obtain the ground state energy with much higher accuracy than the standard RG. We have also obtained the staggered magnetization and the z-component of spin–spin correlation function which confirms the absence of long-range order in the massless region of the 1D XXZ model.

scholarly journals Quantum Spin Systems at Positive Temperature

2006 ◽  
Vol 269 (3) ◽  
pp. 611-657 ◽  
Author(s):  
Marek Biskup ◽  
Lincoln Chayes ◽  
Shannon Starr
Keyword(s):  
Quantum Spin ◽  
Spin Systems ◽  
Positive Temperature ◽  
Quantum Spin Systems
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