Browsing by Subject "Ansatz de Bethe"

Now showing items 1-3 of 3

    • Ansatz de Bethe para cadeias quânticas de spin-1 com condições de contorno 

      Fireman, Elton Casado (Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 21/03/2002)
      The procedure for obtaining integrable open spin chain Hamiltonians via reflection matrices explicitly carried out for some three-state vertex models. We have considered the 19-vertex models of Zamolodchikov-Fateev and ...

    • A equação de Yang-Baxter para modelos de vértices com três estados 

      Pimenta, Rodrigo Alves (Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 02/03/2011)
      In this work we study the solutions of the Yang-Baxter equation associated to nineteen vertex models invariant by the parity-time symmetry from the perspective of algebraic geometry. We determine the form of the algebraic ...

    • Termodinâmica de modelos integráveis 

      Tavares, Thiago Silva (Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 20/01/2014)
      In this work we study the thermodynamics of integrable spin chains, like the Heisenberg model and it's spin-s generalization with competing interactions. We have used the quantum transfer matrix approach and obtained a ...