IFIR 05409
INSTITUTO DE FISICA DE ROSARIO
Unidad Ejecutora - UE
artículos
Título:
The role of the ghost fields in the renormalized t-J Lagrangian model.
Autor/es:
O. S. ZANDRON
Revista:
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
Editorial:
World Scientific
Referencias:
Lugar: Londres; Año: 2009 p. 493 - 519
ISSN:
0217-9792
Resumen:
The present work treats the role of ghost fields in the renormalization procedure of the Lagrangian perturbative formalism of the t-J model. We show that by introducing proper ghost field variables, the propagators and vertices can be renormalized to each order. In particular, the renormalizad ferromagnetic magnon propagator coming from our previus Lagrangian formalism is studied in detail, and it is show how the thermal softening of the magnon frequency is predicted by the model. The antiferromagnetic case is also analyzed, and the results are confronted with the previous one obtained by means of the spin-polaron theories.
