Artículo
RVB signatures in the spin dynamics of the square-lattice Heisenberg antiferromagnet
Fecha de publicación:
03/2016
Editorial:
IOP Publishing
Revista:
Europhysics Letters
ISSN:
0295-5075
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We investigate the spin dynamics of the square-lattice spin- 1/2 Heisenberg antiferromagnet by means of an improved mean-field Schwinger boson calculation. By identifying both, the long-range Neel and the RVB-like components of the ground state, we propose an educated guess for the mean-field magnetic excitation consisting on a linear combination of local and bond spin flips to compute the dynamical structure factor. Our main result is that when this magnetic excitation is optimized in such a way that the corresponding sum rule is fulfilled, we recover the low- and high-energy spectral weight features of the experimental spectrum. In particular, the anomalous spectral weight depletion at (π, 0) found in recent inelastic neutron scattering experiments can be attributed to the interference of the triplet bond excitations of the RVB component of the ground state. We conclude that the Schwinger boson theory seems to be a good candidate to adequately interpret the dynamic properties of the square-lattice Heisenberg antiferromagnet.
Palabras clave:
Dynamic Properties
,
Antiferromagnetics
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Colecciones
Articulos(IFIR)
Articulos de INST.DE FISICA DE ROSARIO (I)
Articulos de INST.DE FISICA DE ROSARIO (I)
Citación
Ghioldi, Esteban Agustín; Gonzalez, Matías Gabriel; Manuel, Luis Oscar; Trumper, Adolfo Emilio; RVB signatures in the spin dynamics of the square-lattice Heisenberg antiferromagnet
; IOP Publishing; Europhysics Letters; 113; 5; 3-2016; 1-6; 57001
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