The free energy in 1D sine-Gordon-Thirring model with impurity coupling is studied by means of functionalintegrals and variational-cumulant expansion methods.Two variational parameters are introduced to evaluate free ...The free energy in 1D sine-Gordon-Thirring model with impurity coupling is studied by means of functionalintegrals and variational-cumulant expansion methods.Two variational parameters are introduced to evaluate free energyand statistical averages.It is shown that the non-perturbation method of functional integrals can be applied to strong-coupling range of fermion systems.展开更多
基金the Natural Science Foundation of Sichuan Normal University
文摘The free energy in 1D sine-Gordon-Thirring model with impurity coupling is studied by means of functionalintegrals and variational-cumulant expansion methods.Two variational parameters are introduced to evaluate free energyand statistical averages.It is shown that the non-perturbation method of functional integrals can be applied to strong-coupling range of fermion systems.