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Doctoral Thesis
DOI
10.11606/T.76.2007.tde-17022011-163704
Document
Author
Full name
Amilton de Matos Teixeira
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2007
Supervisor
Committee
Libero, Valter Luiz (President)
Aguiar, Cíntia
Napolitano, Reginaldo de Jesus
Oliveira, Nilson Antunes de
Yoshida, Makoto
Title in Portuguese
Grupo de renormalização numérico com banda assimétrica
Keywords in Portuguese
Assimetria
Campo magnético
Grupo de renormalização numérico
Abstract in Portuguese
Este trabalho apresenta um tratamento do Grupo de Renormalização Numérico (GRN) que permite a inclusão de assimetrias na banda de condução, como a provocada por campo magnetostático aplicado a sistemas de spins localizados em metais. Resultados para calor específico e suscetibilidade magnética de spin são obtidos para os modelos de Kondo de dois canais (MK2C), de Falikov-Kimball (MFK) e o modelo de nível ressonante na presença dessas assimetrias. São apresentadas soluções para lidar com as oscilações espúrias das curvas do calor específico, inerentes ao GRN. Tais abordagens, contribuíram de forma determinante para a viabilidade dos resultados apresentados aqui para essas grandezas.
Title in English
Numerical renormalization group for asymmetric conduction band
Keywords in English
Asymmetry
Magnetic field
Numerical renormalization group
Abstract in English
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.
 
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Publishing Date
2011-02-18
 
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