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Qualitative breakdown of the non-crossing approximation for the symmetric one-channel Anderson impurity model at all temperatures

Autor: Sposetti, C. N., Manuel, L. O., Roura-Bas, P.

The Anderson impurity model is studied by means of the self-consistent hybridization expansions in its non-crossing (NCA) and one-crossing (OCA) approximations. We have found that for the one-channel spin-$1/2$ particle-hole symmetric Anderson model,

Externí odkaz: http://arxiv.org/abs/1608.03018

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Classical Antiferromagnetism in Kinetically Frustrated Electronic Models

Autor: Sposetti, C. N., Bravo, B., Trumper, A. E., Gazza, C. J., Manuel, L. O.

We study the infinite U Hubbard model with one hole doped away half-filling, in triangular and square lattices with frustrated hoppings that invalidate Nagaoka's theorem, by means of the density matrix renormalization group. We find that these kineti

Externí odkaz: http://arxiv.org/abs/1312.6672

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Broken discrete and continuous symmetries in two dimensional spiral antiferromagnets

Autor: Mezio, A., Sposetti, C. N., Manuel, L. O., Trumper, A. E.

We study the occurrence of symmetry breakings, at zero and finite temperatures, in the J_1-J_3 antiferromagnetic Heisenberg model on the square lattice using Schwinger boson mean field theory. For spin-1/2 the ground state breaks always the SU(2) sym

Externí odkaz: http://arxiv.org/abs/1310.4798

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A test of the bosonic spinon theory for the triangular antiferromagnet spectrum

Autor: Mezio, A., Sposetti, C. N., Manuel, L. O., Trumper, A. E.

Publikováno v: Europhysics Letters 94, 47001 (2011)

We compute the dynamical structure factor of the spin-1/2 triangular Heisenberg model using the mean field Schwinger boson theory. We find that a reconstructed dispersion, resulting from a non trivial redistribution of the spectral weight, agrees qui

Externí odkaz: http://arxiv.org/abs/1011.0874

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