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Abstract:

The Kondo effect observed in recent scanning tunneling microscopy (STM) experiments on transport through CoPc and TBrPP-Co molecules adsorbed on Au(111) and Cu(111) surfaces, respectively, is discussed within the framework of a simple model. Both molecules show a four lobed structure with Co placed in its center, the active Co d orbital lying at lower energy in the TBrPP-Co molecule. In the Kondo regime, and by varying the ratio r of STM tip/Co to STM tip/lobes hoppings, it is possible to produce a crossover from a conductance Kondo peak (CoPc, high r) to a conductance Fano dip (TBrPP-Co, r around 1). The essential role of the internal structure of the molecule in controlling even the entrance into the Kondo regime is highlighted. In particular, it is shown that the crossover from Fano dip to Kondo peak can also be produced, changing the sign of the lobe/lobe hopping while keeping that ratio constant. In the case of TBrPP-Co/Cu (111), we show that varying the density of states at the metal surface, or distorting the molecule, changes the shape of the Fano dip and the Kondo temperature, and shifts the dip minimum. These features are in line with experimental observations, indicating that our simple model contains the essential physics underlying the transport properties of such complex molecules. © 2007 The American Physical Society.

Registro:

Documento: Artículo
Título:Kondo effect in transport through molecules adsorbed on metal surfaces: From Fano dips to Kondo peaks
Autor:Aguiar-Hualde, J.M.; Chiappe, G.; Louis, E.; Anda, E.V.
Filiación:Departamento de Física, J.J. Giambiaggi, Facultad de Ciencias Exactas, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Departamento de Física Aplicada, Unidad Asociada del Consejo Superior de Investigaciones Científicas, Universidad de Alicante, San Vicente del Raspeig, Alicante 03690, Spain
Departamento de Física, Pontificia Universidade Católica do Rio de Janeiro (PUC-Rio), Caixa Postal 22452-970, 38071 Rio de Janeiro, Brazil
Año:2007
Volumen:76
Número:15
DOI: http://dx.doi.org/10.1103/PhysRevB.76.155427
Título revista:Physical Review B - Condensed Matter and Materials Physics
Título revista abreviado:Phys. Rev. B Condens. Matter Mater. Phys.
ISSN:10980121
CODEN:PRBMD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v76_n15_p_AguiarHualde

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Citas:

---------- APA ----------
Aguiar-Hualde, J.M., Chiappe, G., Louis, E. & Anda, E.V. (2007) . Kondo effect in transport through molecules adsorbed on metal surfaces: From Fano dips to Kondo peaks. Physical Review B - Condensed Matter and Materials Physics, 76(15).
http://dx.doi.org/10.1103/PhysRevB.76.155427
---------- CHICAGO ----------
Aguiar-Hualde, J.M., Chiappe, G., Louis, E., Anda, E.V. "Kondo effect in transport through molecules adsorbed on metal surfaces: From Fano dips to Kondo peaks" . Physical Review B - Condensed Matter and Materials Physics 76, no. 15 (2007).
http://dx.doi.org/10.1103/PhysRevB.76.155427
---------- MLA ----------
Aguiar-Hualde, J.M., Chiappe, G., Louis, E., Anda, E.V. "Kondo effect in transport through molecules adsorbed on metal surfaces: From Fano dips to Kondo peaks" . Physical Review B - Condensed Matter and Materials Physics, vol. 76, no. 15, 2007.
http://dx.doi.org/10.1103/PhysRevB.76.155427
---------- VANCOUVER ----------
Aguiar-Hualde, J.M., Chiappe, G., Louis, E., Anda, E.V. Kondo effect in transport through molecules adsorbed on metal surfaces: From Fano dips to Kondo peaks. Phys. Rev. B Condens. Matter Mater. Phys. 2007;76(15).
http://dx.doi.org/10.1103/PhysRevB.76.155427