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Type: Artigo de periódico
Title: First direct observation of Dirac fermions in graphite
Author: Zhou, SY
Gweon, GH
Graf, J
Fedorov, AV
Spataru, CD
Diehl, RD
Kopelevich, Y
Lee, DH
Louie, SG
Lanzara, A
Abstract: Originating from relativistic quantum field theory, Dirac fermions have been invoked recently to explain various peculiar phenomena in condensed-matter physics, including the novel quantum Hall effect in graphene(1,2), the magnetic-field-driven metal - insulator-like transition in graphite(3,4), super. uidity in He-3 ( ref. 5) and the exotic pseudogap phase of high-temperature superconductors(6,7). Despite their proposed key role in those systems, direct experimental evidence of Dirac fermions has been limited. Here, we report the first direct observation of relativistic Dirac fermions with linear dispersion near the Brillouin zone (BZ) corner H, which coexist with quasiparticles that have a parabolic dispersion near another BZ corner K. In addition, we also report a large electron pocket that we attribute to defect-induced localized states. Thus, graphite presents a system in which massless Dirac fermions, quasiparticles with finite effective mass and defect states all contribute to the low-energy electronic dynamics.
Country: Inglaterra
Editor: Nature Publishing Group
Citation: Nature Physics. Nature Publishing Group, v. 2, n. 9, n. 595, n. 599, 2006.
Rights: fechado
Identifier DOI: 10.1038/nphys393
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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