Artículo
Quantum Monte Carlo method for models of molecular nanodevices
Fecha de publicación:
12/2005
Editorial:
American Physical Society
Revista:
Physical Review B: Condensed Matter and Materials Physics
ISSN:
1098-0121
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Resumen
We introduce a quantum Monte Carlo technique to calculate exactly at finite temperatures the Green function of a fermionic quantum impurity coupled to a bosonic field. While the algorithm is general, we focus on the single impurity Anderson model coupled to a Holstein phonon as a schematic model for a molecular transistor. We compute the density of states at the impurity in a large range of parameters, to demonstrate the accuracy and efficiency of the method. We also obtain the conductance of the impurity model and analyze different regimes. The results show that even in the case when the effective attractive phonon interaction is larger than the Coulomb repulsion, a Kondo-like conductance behavior might be observed. © 2005 The American Physical Society.
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Articulos(IFIBA)
Articulos de INST.DE FISICA DE BUENOS AIRES
Articulos de INST.DE FISICA DE BUENOS AIRES
Citación
Arrachea, Liliana del Carmen; Rozenberg, Marcelo Javier; Quantum Monte Carlo method for models of molecular nanodevices; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 72; 4; 12-2005; 41301-41304
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