Phys. Rev. Lett. 89, 016402 (2002) [4 pages]Gapless Spin-1 Neutral Collective Mode Branch for Graphite
Using the standard tight binding model of 2D graphite with short range electron repulsion, we predict a gapless spin-1, neutral collective mode branch below the particle-hole continuum with energy vanishing linearly with momenta at the Γ and K points in the Brillouin zone. This spin-1 mode has a wide energy dispersion, 0 to ∼2eV, and is not Landau damped. The “Dirac cone spectrum” of electrons at the chemical potential of graphite generates our collective mode, so we call this “spin-1 zero sound” of the “Dirac sea.” Epithermal neutron scattering experiments and spin polarized electron energy loss spectroscopy can be used to confirm and study our collective mode. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.016402
DOI:
10.1103/PhysRevLett.89.016402
PACS:
71.10.-w, 79.60.-i, 81.05.Uw
See AlsoComment: N. M. Peres, M. A. Araújo, and A. H. Neto, Comment on “Gapless Spin-1 Neutral Collective Mode Branch for Graphite”, Phys. Rev. Lett. 92, 199701 (2004). Reply: G. Baskaran and S. A. Jafari, Baskaran and Jafari Reply:, Phys. Rev. Lett. 92, 199702 (2004). |
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