INVESTIGADORES
LAMAS Carlos Alberto
artículos
Título:
A comparison between disordered quantum spin 1/2 chains
Autor/es:
C.A. LAMAS; D.C. CABRA; M.D. GRYNBERG; G.L. ROSSINI
Revista:
PHYSICAL REVIEW B
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2006 vol. 74 p. 224435 - 224442
ISSN:
1098-0121
Resumen:
We study the magnetic properties of two types of one dimensional XX spin
1/2 chains. The first type has only nearest neighbor interactions which
can be either antiferromagnetic or ferromagnetic and the second type
which has both nearest neighbor and next nearest neighbor interactions,
but only antiferromagnetic in character. We study these systems in the
presence of low transverse magnetic fields both analytically and
numerically. Comparison of results show a close relation between the two
systems, which is in agreement with results previously found in
Heisenberg chains by means of a numerical real space renormalization
group procedure.