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pro vyhledávání: '"Ebrahimkhas, M."'
Autor:
Shahbazy, A., Ebrahimkhas, M.
Publikováno v:
Chinese Journal of Physics, 2019
We employ the dynamical mean field approximation to study the effects of ionic potential ($\Delta$) on the square lattice Hubbard model. At half-filling when the staggered potential ($\Delta$) dominates the on-site Hubbard interaction ($U$), the syst
Externí odkaz:
http://arxiv.org/abs/1804.07969
Publikováno v:
Physics Letters A, 2015, 379
In a honeycomb lattice the symmetry has been broken by adding an ionic potential and a single-particle gap was generated in the spectrum. We have employed the iterative perturbation theory (IPT) in dynamical mean field approximation method to study t
Externí odkaz:
http://arxiv.org/abs/1412.0079
Autor:
Ebrahimkhas, M.
Publikováno v:
Chin. J. Phys. 52 (2014) 1602
In this research has been studied the possibility of existence the neutral triplet collective mode in undoped graphene and graphite without one-cone approximation. This work tries to study this collective mode from different points of view. It also s
Externí odkaz:
http://arxiv.org/abs/1411.6196
Autor:
Ebrahimkhas, M.
Publikováno v:
Phys. Lett. A, 375 (2011) 3223
Phase transition in a honeycomb lattice is studied by the means of the two dimensional Hubbard model and the exact diagonalization dynamical mean field theory at zero temperature. At low energies, the dispersion relation is shown to be a linear funct
Externí odkaz:
http://arxiv.org/abs/1409.8006
Autor:
Ebrahimkhas, M., Jafari, S. A.
Publikováno v:
Eur. Phys. Lett. Vol. 98 (2012) 27009
Tight binding electrons on a honeycomb lattice are described by an effective Dirac theory at low energies. Lowering symmetry by an alternate ionic potential ($\Delta$) generates a single-particle gap in the spectrum. We employ the dynamical mean fiel
Externí odkaz:
http://arxiv.org/abs/1112.3616
Particle-hole continuum in Dirac sea of graphene has a unique window underneath, which provides a unique opportunity for emergence of a pole in the susceptibility of the {\em triplet} particle-hole channel in the entire Brillouin zone (BZ). Here we u
Externí odkaz:
http://arxiv.org/abs/0910.1180
Autor:
Ebrahimkhas, M., Jafari, S. A.
Publikováno v:
Phys. Rev. B 79 (2009) 205425
In an earlier work we predicted the existence of a neutral triplet collective mode in undoped graphene and graphite [Phys. Rev. Lett. {\bf 89} (2002) 16402]. In this work we study a phenomenological Hamiltonian describing the interaction of tight-bin
Externí odkaz:
http://arxiv.org/abs/0902.1246
Publikováno v:
In Physics Letters A 12 June 2015 379(14-15):1053-1056
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Autor:
Ebrahimkhas, M.
Publikováno v:
In Physics Letters A 22 August 2011 375(36):3223-3227