Artículo
Long-range interactions in antiferromagnetic quantum spin chains
Fecha de publicación:
08/2017
Editorial:
American Physical Society
Revista:
Physical Review B
ISSN:
2469-9969
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We study the role of long-range dipolar interactions on antiferromagnetic spin chains, from the classical S→ limit to the deep quantum case S=1/2, including a transverse magnetic field. To this end, we combine different techniques such as classical energy minima, classical Monte Carlo, linear spin waves, bosonization, and density matrix renormalization group (DMRG). We find a phase transition from the already reported dipolar ferromagnetic region to an antiferromagnetic region for high enough antiferromagnetic exchange. Thermal and quantum fluctuations destabilize the classical order before reaching magnetic saturation in both phases, and also close to zero field in the antiferromagnetic phase. In the extreme quantum limit S=1/2, extensive DMRG computations show that the main phases remain present with transition lines to saturation significatively shifted to lower fields, in agreement with the bosonization analysis. The overall picture maintains a close analogy with the phase diagram of the anisotropic XXZ spin chain in a transverse field.
Palabras clave:
Magnetism
,
Long Range
,
Dipolar Interaction
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Articulos de INST.DE FISICA LA PLATA
Citación
Bravo, Barbara; Cabra, Daniel Carlos; Gómez Albarracín, Flavia Alejandra; Rossini, Gerardo Luis; Long-range interactions in antiferromagnetic quantum spin chains; American Physical Society; Physical Review B; 96; 5; 8-2017; 1-7; 054441
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