Disorder-induced order in quantum XY chains

We observe signatures of disorder-induced order in one-dimensional XY spin chains with an external site-dependent uniaxial random field within the XY plane. We numerically investigate signatures of a quantum phase transition at T=0, in particular, an upsurge of the magnetization in the direction ort...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2010-07, Vol.82 (1), Article 013630
Main Authors: Niederberger, A., Rams, M. M., Dziarmaga, J., Cucchietti, F. M., Wehr, J., Lewenstein, M.
Format: Article
Language:English
Subjects:
AMPLITUDES
ANGULAR MOMENTUM
ATOMIC AND MOLECULAR PHYSICS
ATOMS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
ENTROPY
MAGNETIC FIELDS
MAGNETISM
MAGNETIZATION
ONE-DIMENSIONAL CALCULATIONS
PARTICLE PROPERTIES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
QUANTUM STATES
RANDOMNESS
SPIN
THERMODYNAMIC PROPERTIES
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Summary:We observe signatures of disorder-induced order in one-dimensional XY spin chains with an external site-dependent uniaxial random field within the XY plane. We numerically investigate signatures of a quantum phase transition at T=0, in particular, an upsurge of the magnetization in the direction orthogonal to the external magnetic field and the scaling of the block entropy with the amplitude of this field. Also, we discuss possible realizations of this effect in ultracold atomic experiments.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.82.013630