TY - JOUR
T1 - Electron decay rates in a zero-gap graphite layer
AU - Ho, J. H.
AU - Chang, C. P.
AU - Chen, R. B.
AU - Lin, M. F.
N1 - Funding Information:
This work was supported by the National Science Council of Taiwan, under the Grant No. NSC 93-2112-M-006-002.
PY - 2006/9/18
Y1 - 2006/9/18
N2 - A 2D monolayer graphite exhibits rich Coulomb excitations and deexcitations, mainly owing to the zero-gap characteristic. The low-frequency electronic excitations include interband e-h excitations, intraband e-h excitations, and plasmon. The two latters are purely caused by temperature. The Coulomb decay rate strongly depends on temperature and wave vector (or energy), and the analytic formulas between them are absent. The Coulomb decay rate of the Fermi-momentum state only comes from the intraband e-h excitations. It grows quickly as temperature increases. Its value is close to the measured results of the layered graphite. As to other states, three kinds of electronic excitations make important contributions to the Coulomb decay rates and cause the novel dependence on wave vector. The Coulomb decay rate is much faster than the electron-phonon scattering rate. A 2D monolayer graphite quite differs from a 2D electron gas or a 1D gapless carbon nanotube in electronic excitations and deexcitations.
AB - A 2D monolayer graphite exhibits rich Coulomb excitations and deexcitations, mainly owing to the zero-gap characteristic. The low-frequency electronic excitations include interband e-h excitations, intraband e-h excitations, and plasmon. The two latters are purely caused by temperature. The Coulomb decay rate strongly depends on temperature and wave vector (or energy), and the analytic formulas between them are absent. The Coulomb decay rate of the Fermi-momentum state only comes from the intraband e-h excitations. It grows quickly as temperature increases. Its value is close to the measured results of the layered graphite. As to other states, three kinds of electronic excitations make important contributions to the Coulomb decay rates and cause the novel dependence on wave vector. The Coulomb decay rate is much faster than the electron-phonon scattering rate. A 2D monolayer graphite quite differs from a 2D electron gas or a 1D gapless carbon nanotube in electronic excitations and deexcitations.
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U2 - 10.1016/j.physleta.2006.04.077
DO - 10.1016/j.physleta.2006.04.077
M3 - Article
AN - SCOPUS:33746242252
VL - 357
SP - 401
EP - 406
JO - Physics Letters, Section A: General, Atomic and Solid State Physics
JF - Physics Letters, Section A: General, Atomic and Solid State Physics
SN - 0375-9601
IS - 4-5
ER -