Although effective for two dimensional (2D) systems, some approximations may fail in describing the properties of one-dimensional (ID) models, which belong to a different universality class. In this paper, we analyze the adequacy of the Composite Operator Method (COM), which provides a good description of many features of 2D strongly correlated systems, in grasping the physics of ID models. To this purpose, the ID Hubbard model is studied within the framework of the COM by considering a two-pole approximation and a paramagnetic ground state. The local, thermodynamic and single-particle properties, the correlation functions and susceptibilities are calculated in the case of half filling and arbitrary filling. The results are compared with those obtained by the Bethe ansatz (BA) as well as by other numerical and analytical techniques. The advantages and limitations of the method are analyzed in detail.
The ID Hubbard model within the composite operator method
AVELLA, Adolfo;MANCINI, Ferdinando;
2002-01-01
Abstract
Although effective for two dimensional (2D) systems, some approximations may fail in describing the properties of one-dimensional (ID) models, which belong to a different universality class. In this paper, we analyze the adequacy of the Composite Operator Method (COM), which provides a good description of many features of 2D strongly correlated systems, in grasping the physics of ID models. To this purpose, the ID Hubbard model is studied within the framework of the COM by considering a two-pole approximation and a paramagnetic ground state. The local, thermodynamic and single-particle properties, the correlation functions and susceptibilities are calculated in the case of half filling and arbitrary filling. The results are compared with those obtained by the Bethe ansatz (BA) as well as by other numerical and analytical techniques. The advantages and limitations of the method are analyzed in detail.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
