Kondo effect in transport through molecules adsorbed on metal surfaces: From Fano dips to Kondo peaks

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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...

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Autores principales:	Aguiar-Hualde, J.M., Chiappe, G., Louis, E., Anda, E.V.
Formato:	JOUR
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_10980121_v76_n15_p_AguiarHualde
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_10980121_v76_n15_p_AguiarHualde
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spelling	todo:paper_10980121_v76_n15_p_AguiarHualde2023-10-03T16:06:04Z Kondo effect in transport through molecules adsorbed on metal surfaces: From Fano dips to Kondo peaks Aguiar-Hualde, J.M. Chiappe, G. Louis, E. Anda, E.V. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10980121_v76_n15_p_AguiarHualde
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description	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.
format	JOUR
author	Aguiar-Hualde, J.M. Chiappe, G. Louis, E. Anda, E.V.
spellingShingle	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
author_facet	Aguiar-Hualde, J.M. Chiappe, G. Louis, E. Anda, E.V.
author_sort	Aguiar-Hualde, J.M.
title	Kondo effect in transport through molecules adsorbed on metal surfaces: From Fano dips to Kondo peaks
title_short	Kondo effect in transport through molecules adsorbed on metal surfaces: From Fano dips to Kondo peaks
title_full	Kondo effect in transport through molecules adsorbed on metal surfaces: From Fano dips to Kondo peaks
title_fullStr	Kondo effect in transport through molecules adsorbed on metal surfaces: From Fano dips to Kondo peaks
title_full_unstemmed	Kondo effect in transport through molecules adsorbed on metal surfaces: From Fano dips to Kondo peaks
title_sort	kondo effect in transport through molecules adsorbed on metal surfaces: from fano dips to kondo peaks
url	http://hdl.handle.net/20.500.12110/paper_10980121_v76_n15_p_AguiarHualde
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Kondo effect in transport through molecules adsorbed on metal surfaces: From Fano dips to Kondo peaks

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