Numerical renormalization group for asymmetric conduction band

Author(s)

Amilton de Matos Teixeira

• Document type: Doctoral Thesis
• Press: São Carlos.
• Institution: Universidade de São Paulo (USP). Instituto de Física de São Carlos (IFSC/BT)
• Defense date: 2007-07-12

Examining board members

Valter Luiz Libero; Cíntia Aguiar; Reginaldo de Jesus Napolitano; Nilson Antunes de Oliveira; Makoto Yoshida

• Advisor: Valter Luiz Libero

Abstract

This work presents an approach to the Numerical Renormalization Group which allows for asymmetries in the conduction band, as those brought about by magnetostatic field applied to a system of localized spin in metal. Results for specific heat and magnetic susceptibility are shown for the two-channel Kondo model, as well for the Falikov-Kimball and resonant level models, in the presence of such asymmetry. In addition, novel treatments were described in order to smooth out the curves of specific heat from the oscilating profile that comes along from NRG calculations. This was of outmost importance for the viability of the results presented here. (AU)