Cotunneling theory of atomic spin inelastic electron tunneling spectroscopy
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Título: | Cotunneling theory of atomic spin inelastic electron tunneling spectroscopy |
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Autor/es: | Delgado Acosta, Fernando | Fernández-Rossier, Joaquín |
Grupo/s de investigación o GITE: | Grupo de Nanofísica |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física Aplicada |
Palabras clave: | Cotunneling | Inelastic electron tunneling spectroscopy | Magnetic atoms | Atomic spin |
Área/s de conocimiento: | Física de la Materia Condensada |
Fecha de publicación: | 19-jul-2011 |
Editor: | American Physical Society |
Cita bibliográfica: | DELGADO, F.; FERNÁNDEZ-ROSSIER, J. “Cotunneling theory of atomic spin inelastic electron tunneling spectroscopy”. Physical Review B. Vol. 84, No. 4 (2011). ISSN 1098-0121, pp. 045439-1/11 |
Resumen: | We propose cotunneling as the microscopic mechanism that makes possible inelastic electron tunneling spectroscopy of magnetic atoms in surfaces for a wide range of systems, including single magnetic adatoms, molecules, and molecular stacks. We describe electronic transport between the scanning tip and the conducting surface through the magnetic system (MS) with a generalized Anderson model, without making use of effective spin models. Transport and spin dynamics are described with an effective cotunneling Hamiltonian in which the correlations in the magnetic system are calculated exactly and the coupling to the electrodes is included up to second order in the tip MS and MS substrate. In the adequate limit our approach is equivalent to the phenomenological Kondo exchange model that successfully describes the experiments. We apply our method to study in detail inelastic transport in two systems, stacks of cobalt phthalocyanines and a single Mn atom on Cu2N. Our method accounts for both the large contribution of the inelastic spin exchange events to the conductance and the observed conductance asymmetry. |
Patrocinador/es: | This work was supported by MEC-Spain (MAT07-67845, FIS2010-21883-C02-01, Grants JCI-2008-01885 and CONSOLIDER CSD2007-00010) and Generalitat Valenciana (ACOMP/2010/070). |
URI: | http://hdl.handle.net/10045/25240 |
ISSN: | 1098-0121 (Print) | 1550-235X (Online) |
DOI: | 10.1103/PhysRevB.84.045439 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | ©2011 American Physical Society |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1103/PhysRevB.84.045439 |
Aparece en las colecciones: | INV - Grupo de Nanofísica - Artículos de Revistas |
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