Low Temperature Physics: 35, 679 (2009); https://doi.org/10.1063/1.3224726 (8 pages)
Fizika Nizkikh Temperatur: Volume 35, Number 8-9 (August 2009), p. 862-871    ( to contents , go back )

Effect of defects on quasiparticles spectra of graphite and graphene

A. Feher

Centre of Low Temperature Physics Faculty of Science P.J. Šafàrik University & Institute of Experimental Physics SAS Park Angelinum 9, 041 54 Košice, Slovakia
E-mail: alexander.feher@upjs.sk

I.A. Gospodarev, V.I. Grishaev, K.V. Kravchenko, E.V. Manzhelii, E.S. Syrkin, and S.B. Feodosyev

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: syrkin@ilt.kharkov.ua
pos Анотація:

Received April 3, 2009

Abstract

It is shown that the spectral density of phonons polarized along c axis has in graphite the V-type singularity analogous to so-called Dirac singularity typical for the graphene electron density of states. We study the appearance of quasilocalized states which increase number of quasiparticles near this singularity by using as examples the phonon spectra of graphite intercalated by metals and electron spectra of graphene containing vacancies. It is proved that in the electron spectrum of graphene with isolated vacancy the quasilocalized states exist only for atoms from sublattice not containing this defect.

PACS: 63.20.–e Phonons in crystal lattices;
PACS: 63.22.+m Phonons or vibrational states in low-dimensional structures and nanoscale materials;
PACS: 73.20.At Surface states, band structure,electron density of states.

Key words: quasiparticle spectrum, quasi-two-dimensional crystals, graphene, graphite, Green function.

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