Probing local moments in nanographenes with electron tunneling spectroscopy
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Título: | Probing local moments in nanographenes with electron tunneling spectroscopy |
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Autor/es: | 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: | Nanographenes | Local moments | Electron tunneling spectroscopy |
Área/s de conocimiento: | Física Aplicada | Física de la Materia Condensada |
Fecha de publicación: | dic-2020 |
Editor: | Elsevier |
Cita bibliográfica: | Progress in Surface Science. 2020, 95(4): 100595. https://doi.org/10.1016/j.progsurf.2020.100595 |
Resumen: | The emergence of local moments in graphene zigzag edges, grain boundaries, vacancies and sp3 defects has been widely studied theoretically. However, conclusive experimental evidence is scarce. Recent progress in on-surface synthesis has made it possible to create nanographenes, such as triangulenes, with local moments in their ground states, and to probe them using scanning tunneling microscope (STM) spectroscopy. Here we review the application of the theory of sequential and cotunneling transport to relate the dI/dV spectra with the spin properties of nanographenes probed by STM. This approach permits us to connect the dI/dV with the many-body energies and wavefunctions of the graphene nanostructures. We apply this method describing the electronic states of the nanographenes by means of exact diagonalization of the Hubbard model within a restricted Active Space. This permits us to provide a proper quantum description of the emergence of local moments in graphene and its interplay with transport. We discuss the results of this theory in the case of diradical nanographenes, such as triangulene, rectangular ribbons and the Clar’s goblet, that have been recently studied experimentally by means of STM spectroscopy. This approach permits us to calculate both the dI/dV spectra, that yields excitation energies, as well as the atomically resolved conductivity maps, that provide information on the wavefunctions of the collective spin modes. |
Patrocinador/es: | We acknowledge financial support from Ministry of Science and Innovation of Spain (grant numbers PID2019-106114GB-I00 and PID2019- 109539GB), from MINECO-Spain (Grant No. MAT2016-78625-C2) and from the Portuguese Fundação para a Ciência e a Tecnologia (FCT) for the projects P2020-PTDC/FIS-NAN/4662/2014, P2020-PTDC/FIS-NAN/3668/2014 and UTAPEXPL/NTec/0046/2017 projects. JFR acknowledges Generalitat Valenciana funding (Prometeo2017/139). R. O. acknowledge ACIF/2018/175 (Generalitat Valenciana and Fondo Social Europeo). |
URI: | http://hdl.handle.net/10045/110628 |
ISSN: | 0079-6816 (Print) | 1878-4240 (Online) |
DOI: | 10.1016/j.progsurf.2020.100595 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2020 Elsevier Ltd. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1016/j.progsurf.2020.100595 |
Aparece en las colecciones: | INV - Grupo de Nanofísica - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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Ortiz_Fernandez-Rossier_2020_ProgrSurfaceSci_final.pdf | Versión final (acceso restringido) | 2,29 MB | Adobe PDF | Abrir Solicitar una copia |
Ortiz_Fernandez-Rossier_2020_ProgrSurfaceSci_preprint.pdf | Preprint (acceso abierto) | 2,83 MB | Adobe PDF | Abrir Vista previa |
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