Zobrazeno 1 - 10
of 259
pro vyhledávání: '"Plakida, N."'
Autor:
Plakida, N.
Publikováno v:
Moldavian Journal of the Physical Sciences, Vol 8, Iss 1, Pp 7-16 (2009)
A microscopic theory of superconducting pairing within the Hubbard model is discussed. A Dyson equation for the matrix thermodynamic Green function in the Nambu representation for Hubbard operators is derived by applying the Mori-type projection tech
Externí odkaz:
https://doaj.org/article/e91330b4bf59473c83b8dcaee35534fe
Autor:
Plakida, N. M.
Publikováno v:
Condens. Matter Phys., 2020, vol. 23, No, 4, 43701
A consistent microscopic theory of superconductivity for strongly correlated electronic systems is presented. The Dyson equation for the normal and anomalous Green functions for the projected (Hubbard) electronic operators is derived. To compare vari
Externí odkaz:
http://arxiv.org/abs/2101.05150
A microscopic theory of the electronic spectrum and of superconductivity within the t-J model on the honeycomb lattice is developed. We derive the equations for the normal and anomalous Green functions in terms of the Hubbard operators by applying th
Externí odkaz:
http://arxiv.org/abs/1904.13126
Autor:
Plakida, N. M.
Publikováno v:
Condens. Matter Phys., 2018, vol. 21, No. 3, 33706
A microscopic theory of electronic spectrum and superconductivity within the $t$-$J$ model on the honeycomb lattice is formulated. The Dyson equation for the normal and anomalous Green functions for the two-band model in terms of the Hubbard operator
Externí odkaz:
http://arxiv.org/abs/1809.10287
We present a spin-rotation-invariant Green-function theory for the dynamic spin susceptibility in the spin-1/2 antiferromagnetic t-J Heisenberg model on the honeycomb lattice. Employing a generalized mean-field approximation for arbitrary temperature
Externí odkaz:
http://arxiv.org/abs/1803.03140
Publikováno v:
Eur. Phys. J. B 90, 48 (2017)
We present a spin-rotation-invariant Green-function theory for the dynamic spin susceptibility in the spin-1/2 antiferromagnetic Heisenberg model on a stacked honeycomb lattice. Employing a generalized mean-field approximation for arbitrary temperatu
Externí odkaz:
http://arxiv.org/abs/1703.08391
Autor:
Plakida, N.
We discuss a reduction of superconducting transition temperature by the intersite Coulomb repulsion for the d-wave pairing in cuprates. We compare the results found for the spin-fermion model and the extended Hubbard model. We argue that in both the
Externí odkaz:
http://arxiv.org/abs/1607.02935
We consider the quasi-two-dimensional pseudo-spin-1/2 Kitaev - Heisenberg model proposed for A2IrO3 (A=Li, Na) compounds. The spin-wave excitation spectrum, the sublattice magnetization, and the transition temperatures are calculated in the random ph
Externí odkaz:
http://arxiv.org/abs/1602.01961