Six-vertex model and Quantum XXZ Hamiltonian

수학노트
http://bomber0.myid.net/ (토론)님의 2010년 8월 3일 (화) 11:46 판
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introduction
  • ice-type model, R model, Rys model
  • XXZ spin chain and the six-vertex transfer matrix have the same eigenvectors
  • Boltzmann weights
  • monodromy matrix
  • trace of monodromy matrix is the transfer matrix
  • power of transfer matrix becomes the partition function

 

 

types of six vertex models
  • on a square lattice with periodic boundary conditions
  • on a square lattice with domain wall boundary conditions

 

 

transfer matrix
  • finding eigenvalues and eigenvectors of transfer matrix is crucial
  • Bethe ansatz equation is used to find the eigenvectors and eigenvalues of the transfer matrix
  • partition function  is calculated in terms of the eigenvalues of the transfer matrix
  • the below is from Yang-Baxter equation
  • transfer matrix is builtup from matrices of  Boltzmann weights
  • we need the trasfer matrices coming from different set of Boltzman weights commute 
  • partition function = trace of power of transfer matrices
  • so the problem of solving the model is reduced to the computation of this trace

 

 

 

 

 

entropy of two-dimensional ice
  • entropy is given as
    \(Mk\ln W\) where M is the number of molecules and \(W=(4/3)^{3/2}=1.53960\cdots\)

 

 

free energy
  • \(F=-kT \ln Z\)

 

 

partition function

 

 

correlation functions

 

 

anistropic one-dimensional Heisenberg model (XXZ model)
  • Heisenberg spin chain model
  • XXZ model or XXZ spin chain
  • first solved by Bethe 
  • Yang and Yang
  • ground state eigevector for Hamiltonian  is a common eigenvector
  •  

 

 

related items

 

 

books

 

 

encyclopedia

 

 

blogs

 

 

STATISTICAL MECHANICS-A REVIEW OF

SELECTED RIGOROUS RESULTS1•2

By JOEL L. LEBOWITZ

 

 

Method for calculating finite size corrections in Bethe ansatz systems: Heisenberg chain and six-vertex model
de Vega, H. J.; Woynarovich, F.

 

 

articles

 


links