Failure of the Schwinger boson approach in the description of the ground state in the spatially anisotropic Heisenberg model
Departamento de Física, Centro Federal de Educação Tecnológica de Minas Gerais,
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Received in final form: 17 October 2018
Published online: 23 January 2019
Density matrix renormalization group (DMRG) and Schwinger boson mean field theory (SBMFT) are used to study the behavior of the ground state energy in the integer spin two-dimensional anisotropic J1x-J1y-J2 Heisenberg model in the square lattice with second neighbors interactions, where the influence of the critical parameters (Dc vs. J2) have been verified on continuum spin conductivity (AC conductivity). We get a different behavior for the ground state energy using both methods, principally in the limit where the force of the parameters is larger, where the SBMFT theory is expected not to become accurate.
Key words: Statistical and Nonlinear Physics
© EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature, 2019