Metallic graphene nanodisks: Electronic and magnetic properties
By M. Ezawa. 2007
247 citations recorded by the source corpus.
We explore the electronic properties of finite-length graphene nanoribbons as well as graphene nanodisks with various sizes and shapes in quest of metallic ones. For this purpose it is sufficient to search zero-energy states. We find that there exist no zero-energy states in finite-length zigzag nanoribbons though all infinite-length zigzag nanoribbons have zero-energy states. The occurrence of zero-energy states is surprisingly rare. Among typical nanodisks, only trigonal zigzag nanodisks have degenerate zero-energy states and show metallic ferromagnetism, where the degeneracy can be controlled arbitrarily by designing the size. A remarkable property is that the relaxation time is quite large in spite of its small size in trigonal zigzag nanodisks.
Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/cc3cd864af7c8faac6ba4c7dffac1f529152e1a6
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Citations in the corpus
- Electronic properties of mesoscopic graphene structures: Charge confinement and control of spin and charge transport (2011, background): “In general, the spin relaxation time increases with the interaction strength and system size, but remains long even for a relatively small system [122].”
- Emergence of magnetism in graphene materials and nanostructures (2010, background): “It was shown that the total spin of triangular fragments with edges cut along the zigzag direction scales linearly with fragment size (Ezawa, 2007; Fernández-Rossier and Palacios, 2007; Wang et al., 2008a) as illustrated in Figure 6.”