Renormalization of spin excitations and Kondo effect in open-shell nanographenes
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Título: | Renormalization of spin excitations and Kondo effect in open-shell nanographenes |
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Autor/es: | Jacob, David | Ortiz-Cano, Ricardo | 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: | Spin excitations | Kondo effect | Open-shell nanographenes |
Área/s de conocimiento: | Física Aplicada | Física de la Materia Condensada |
Fecha de publicación: | 3-ago-2021 |
Editor: | American Physical Society |
Cita bibliográfica: | Physical Review B. 2021, 104: 075404. https://doi.org/10.1103/PhysRevB.104.075404 |
Resumen: | We study spin excitations and the Kondo effect in open-shell nanographenes, motivated by recent scanning tunneling inelastic spectroscopy experiments. Specifically, we consider three systems: the triangulene, the extended triangulene with rocket shape, both with an S = 1 ground state, and a triangulene dimer with S = 0 on account of intermolecular exchange. We focus on the consequences of hybridization of the nanographene zero modes with a conducting substrate on the dI/dV line shapes associated with spin excitations. The partially filled nanographene zero modes coupled to the conduction electrons in the substrate constitute multiorbital Anderson impurity models that we solve in the one-crossing approximation, which treats the coupling to the substrate to infinite order. We find that the coupling to the substrate leads to (i) renormalization of the spin flip excitation energies of the bare molecule, (ii) broadening of the spectral features, and (iii) the emergence of zero bias Kondo peaks for the S = 1 ground states. The calculated substrate induced shift of the spin excitation energies is found to be significantly larger than their broadening, which implies that this effect has to be considered when comparing experimental results and theory. |
Patrocinador/es: | D.J. acknowledges funding by the Basque Government through grant “Grupos Consolidados UPV/EHU del Gobierno Vasco” (Grant No. IT1249-19). R.O. acknowledges financial support from Generalitat Valenciana and Fondo Social Europeo (Grant No. ACIF/2018/175). J.F.R. acknowledges financial support from Generalitat Valenciana (Prometeo2017/139), and MINECO-Spain (Grant No. PID2019-109539GB-C41). J.F.R. and D.J. acknowledge funding from FEDER/Junta de Andalucía-Consejería de Transformación Económica, Industria, Conocimiento y Universidades, Grant No. P18-FR-4834. |
URI: | http://hdl.handle.net/10045/117194 |
ISSN: | 2469-9950 (Print) | 2469-9969 (Online) |
DOI: | 10.1103/PhysRevB.104.075404 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2021 American Physical Society |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1103/PhysRevB.104.075404 |
Aparece en las colecciones: | INV - Grupo de Nanofísica - Artículos de Revistas |
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Jacob_etal_2021_PhysRevB.pdf | 707,51 kB | Adobe PDF | Abrir Vista previa | |
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