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Excitaciones elementales y ruptura de simetrías en antiferromagnetos frustrados
(2014-03-21)
A lo largo de esta tesis hemos investigado distintos modelos de antiferromagnetos (AF) bidimensionales frustrados utilizando la teoría de campo medio de bosones de Schwinger. Esta teoría provee una formulación invariante ...
Self consistent study of the quantum phases in a frustrated antiferromagnet on the bilayer honeycomb lattice
(IOP Publishing, 2014-04)
We study the frustrated Heisenberg model on the bilayer honeycomb lattice. The ground-state energy and spin gap are calculated, using different bosonic representations at mean field level and numerical calculations, to ...
Path integral approach to order by disorder selection in partially polarized quantum spin systems
(Springer, 2015-07)
In this paper we study the frustrated J1−J2quantum Heisenberg model on the square lattice for J2>J1/2, in a magnetic field. In this regime the classical system is known tohave a degenerate manifold of lowest energy ...