6 papers
The optical conductivity of the quasi one-dimensional conductors: the role of forward scattering by impurities
Peter Kopietz, Guillermo E. Castilla
We calculate the average conductivity sigma (omega) of interacting electrons in one dimension in the presence of a long-range random potential (forward scattering disorder). Taking…
Evidence for a common physical description of non-Fermi-liquid behavior in f-electron systems
M. C. de Andrade, R. Chau, R. P. Dickey +8
The non-Fermi-liquid (NFL) behavior observed in the low temperature specific heat and magnetic susceptibility of f-electron systems is analyzed within the context of…
Non-Fermi liquid behavior and Griffiths phase in {\it f}-electron compounds
A. H. Castro Neto, G. Castilla, B. A. Jones
We study the interplay among disorder, RKKY and Kondo interactions in {\it f}-electron alloys. We argue that the non-Fermi liquid behavior observed in these systems is due to the e…
Quasi-particle behavior of composite fermions in the half-filled Landau level
Peter Kopietz, Guillermo E. Castilla
We calculate the effect of infrared fluctuations of the Chern-Simons gauge field on the single-particle Green's function of composite fermions in the half-filled Landau level via h…
Is the phase transition in the Heisenberg model described by the -expansion of the nonlinear -model?
G. E. Castilla, S. Chakravarty
Nonlinear -model is an ubiquitous model. In this paper, the model where the -component spin is a unit vector, ,is considered. The stability of this model…
How to bosonize fermions with non-linear energy dispersion
Peter Kopietz, Guillermo E. Castilla
We develop a systematic method to treat the effect of non-linearity in the energy dispersion on the usual bosonization result for the single-particle Green's function of fermions i…