Hubbard model

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imported>Pythagoras0님의 2012년 10월 29일 (월) 07:51 판
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introduction

  • The Hubbard model describes hopping electrons on a lattice
  • 1968 Lieb and We
    • application of Bethe ansatz
  • 1972 Takahasi
    • string hypothesis
    • replace the Lieb-Wu equations by simpler ones
    • proceeded to drive a set of non-linear integral equations known as thermodynamic Bethe ansatz equations
  • algebraic Bethe ansatz for the Hubbard model

 

 

Lieb-Wu equations

  • describing Eigenstates of the Hubbard Hamiltonian
    \(\exp(ik_jL)=\prod_{l=1}^{M}\frac{\lambda_{l}-\sin k_j-i u}{\lambda_{l}-\sin k_j+i u}\), \(j=1,\cdots, N\)
    \(\prod_{j=1}^{N}\frac{\lambda_{l}-\sin k_j-i u}{\lambda_{l}-\sin k_j+i u}=\prod_{m=1,m\neq l}^{M}\frac{\lambda_{l}-\lambda_{m}-2i u}{\lambda_{l}-\lambda_{m}+2i u}\), \(l=1,\cdots, M\)

 

 

 

string hypothesis

 

 

 

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