Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Capelle, Klaus"'
We generalize the linear discrete dimensional scaling approach for the repulsive Hubbard model to obtain a nonlinear scaling relation that yields accurate approximations to the ground-state energy in both two and three dimensions, as judged by compar
Externí odkaz:
http://arxiv.org/abs/1904.10529
This comment criticizes the above paper by Xiao-Yin Pan and Viraht Sahni. It is shown that their formulation of "Physical Current Density Functional Theory" is, at best, a garbled reformulation of the Vignale-Rasolt current-density functional theory,
Externí odkaz:
http://arxiv.org/abs/1208.4182
Publikováno v:
New J. Phys. 14, 073021 (2012)
Simple analytical parametrizations for the ground-state energy of the one-dimensional repulsive Hubbard model are developed. The charge-dependence of the energy is parametrized using exact results extracted from the Bethe-Ansatz. The resulting parame
Externí odkaz:
http://arxiv.org/abs/1102.5018
Autor:
França, Vivian V., Capelle, Klaus
Publikováno v:
Physical Review B 82, 134405 (2010)
A combined analytical and numerical study is performed of the mapping between strongly interacting fermions and weakly interacting spins, in the framework of the Hubbard, t-J and Heisenberg models. While for spatially homogeneous models in the thermo
Externí odkaz:
http://arxiv.org/abs/1007.0400
Autor:
Haas, Philipp, Tran, Fabien, Blaha, Peter, Pedroza, Luana S., da Silva, Antonio J. R., Odashima, Mariana M., Capelle, Klaus
Publikováno v:
Phys. Rev. B 81, 125136 (2010)
Eleven density functionals are compared with regard to their performance for the lattice constants of solids. We consider standard functionals, such as the local-density approximation and the Perdew-Burke-Ernzerhof (PBE) generalized-gradient approxim
Externí odkaz:
http://arxiv.org/abs/1003.2530
Publikováno v:
Phys. Rev. B 79, p. R-201106 (2009)
One of the standard generalized-gradient approximations (GGAs) in use in modern electronic-structure theory, PBE, and a recently proposed modification designed specifically for solids, PBEsol, are identified as particular members of a family of funct
Externí odkaz:
http://arxiv.org/abs/0905.1925
Publikováno v:
EPL, 93, 23003 (2011)
The time evolution of the out-of-equilibrium Mott insulator is investigated numerically through calculations of space-time resolved density and entropy profiles resulting from the release of a gas of ultracold fermionic atoms from an optical trap. Fo
Externí odkaz:
http://arxiv.org/abs/0905.1398
Publikováno v:
Phys. Rev. B 78, 205426 (2008)
A density-functional formalism for superconductivity {\em and} magnetism is presented. The resulting relations unify previously derived Kohn-Sham equations for superconductors and for non-collinear magnetism. The formalism, which discriminates Cooper
Externí odkaz:
http://arxiv.org/abs/0804.0562
Autor:
Franca, Vivian V., Capelle, Klaus
Publikováno v:
Phys. Rev. A 77, 062324 (2008)
We calculate the entanglement entropy of blocks of size x embedded in a larger system of size L, by means of a combination of analytical and numerical techniques. The complete entanglement entropy in this case is a sum of three terms. One is a univer
Externí odkaz:
http://arxiv.org/abs/0803.4174
Publikováno v:
Phys. Rev. Lett. 99, 240403 (2007)
We propose an experiment to obtain the phase diagram of the fermionic Hubbard model, for any dimensionality, using cold atoms in optical lattices. It is based on measuring the total energy for a sequence of trap profiles. It combines finite-size scal
Externí odkaz:
http://arxiv.org/abs/0705.3680