Anomalous exchange interaction between intrinsic spins in conducting graphene systems

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(Universidad Nacional de Educación a Distancia (Espanya). Departamento de Física Fundamental)
Soriano, David

(Institut Català de Nanociència i Nanotecnologia)
Palacios, Juan Jose

(Universidad Autónoma de Madrid. Departamento de Física de la Materia Condensada)

Data:	2014
Resum:	We address the nature and possible observable consequences of singular one-electron states that appear when strong defects are introduced in the metallic family of graphene, namely, metallic carbon nanotubes and nanotori. In its simplest form, after creating two defects on the same sublattice, a state may emerge at the Fermi energy presenting very unusual properties: It is unique, normalizable, and features a wave function equally distributed around both defects. As a result, the exchange coupling between the magnetic moments generated by the two defects is anomalous. The intrinsic spins couple ferromagnetically, as expected, but do not present an antiferromagnetic excited state at any distance. We propose the use of metallic carbon nanotubes as an electronic device based on this anomalous coupling between spins which can be useful for the robust transmission of magnetic information at large distances.
Ajuts:	Ministerio de Economía y Competitividad MAT2012-33911 Ministerio de Economía y Competitividad FIS2010-21282-C02-02 Ministerio de Ciencia e Innovación FIS2010-21883 Ministerio de Ciencia e Innovación CSD2007-0010
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Publicat a:	Physical review B : Condensed matter and materials physics, Vol. 89, issue 19 (May 2014) , art. 195416, ISSN 1550-235X

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Registre creat el 2020-09-14, darrera modificació el 2022-09-11