Grand canonical ensemble of the extended two-site Hubbard model via a nonextensive distribution
الموضوعات : Journal of Theoretical and Applied PhysicsFelipe Américo Reyes Navarro 1 , Eusebio Castor Torres-Tapia 2 , Pedro Pacheco Peña 3
1 - Facultad de Ciencias Naturales y Matemática, Universidad Nacional del Callao (UNAC);Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos (UNMSM)
2 - Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos (UNMSM)
3 - Universidad Nacional Tecnológica del Cono Sur (UNTECS), Av. Revolución s/n, Sector 3, Grupo 10, Mz. M Lt. 17
الکلمات المفتاحية: Extended Hubbard model, Quantum statistical mechanics, Thermal properties of small pa,
ملخص المقالة :
AbstractWe hereby introduce a research about a grand canonical ensemble for the extended two-site Hubbard model, that is, we consider the intersite interaction term in addition to those of the simple Hubbard model. To calculate the thermodynamical parameters, we utilize the nonextensive statistical mechanics; specifically, we perform the simulations of magnetic internal energy, specific heat, susceptibility, and thermal mean value of the particle number operator. We found out that the addition of the intersite interaction term provokes a shifting in all the simulated curves. Furthermore, for some values of the on-site Coulombian potential, we realize that, near absolute zero, the consideration of a chemical potential varying with temperature causes a nonzero entropy.PACS75.10.Jm, 05.30.-d, 65.80.+n
