#cparse("/super/config/super.config.vm") #cparse("/nphys/includes/site.config.fhtml")#cparse("${superIncludes}/super.before-doctype.fhtml") #set($articleDate = '20060827') #cparse("${superIncludes}/super.head-top.fhtml") First direct observation of Dirac fermions in graphite : Abstract : $siteName#cparse("${directoryIncludes}/metalink.fhtml") #set($adZone = 'article') #set($artid = '') #set($issue = '9') #set($subjectcode = 'nphys_s6,nphys_s9,') #set($channelcode = '') #set($keyword = "") #set($discipline = '') #set($region = '') #set($careerstg = '') #cparse("${directoryIncludes}/style.fhtml")#cparse("${superIncludes}/super.head-bottom.fhtml") #cparse("${superIncludes}/super.body-top.fhtml")#cparse("${directoryIncludes}/header.fhtml")

Letter abstract

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$siteName 2, 595 - 599 (2006)
doi:10.1038/nphys393

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Subject Categories: Condensed-matter physics | Materials physics

First direct observation of Dirac fermions in graphite

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S. Y. Zhou1,2, G.-H. Gweon1, J. Graf2, A. V. Fedorov3, C. D. Spataru1,4, R. D. Diehl5, Y. Kopelevich6, D.-H. Lee1,2, Steven G. Louie1,2 and A. Lanzara1,2

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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 graphene1, 2, the magnetic-field-driven metal–insulator-like transition in graphite3, 4, superfluidity in 3He (ref. 5) and the exotic pseudogap phase of high-temperature superconductors6, 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.

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  1. Department of Physics, University of California, Berkeley, California 94720, USA
  2. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  3. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  4. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  5. Department of Physics and Materials Research Institute, Penn State University, University Park, Pennsylvania 16802, USA
  6. Instituto de Física 'Gleb Wataghin', Universidade Estadual de Campinas, Unicamp 13083-970, Campinas, Sao Paulo, Brazil

Correspondence to: A. Lanzara1,2 e-mail: ALanzara@lbl.gov

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