Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-12-09
Phys. Rev. B 83, 174428 (2011) [10 pages]
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 8 figures
Scientific paper
10.1103/PhysRevB.83.174428
We present exact results for the ground-state and thermodynamic properties of the spin-1/2 $XX$ chain with three-site interactions in a random (Lorentzian) transverse field. We discuss the influence of randomness on the quantum critical behavior known to be present in the nonrandom model. We find that at zero temperature the characteristic features of the quantum phase transition, such as kinks in the magnetization versus field curve, are smeared out by randomness. However, at low but finite temperatures signatures of the quantum critical behavior are preserved if the randomness is not too large. Even the quantum critical region may be slightly enlarged for very weak randomness. In addition to the exact results for Lorentzian randomness we present a more general discussion of an arbitrarily random transverse magnetic field based on the inspection of the moments of the density of states.
Derzhko Oleg
Derzhko Volodymyr
Richter Johannes
No associations
LandOfFree
Exact solution of a spin-1/2 $XX$ chain with three-site interactions in a random transverse field: Influence of randomness on quantum phase transition does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Exact solution of a spin-1/2 $XX$ chain with three-site interactions in a random transverse field: Influence of randomness on quantum phase transition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exact solution of a spin-1/2 $XX$ chain with three-site interactions in a random transverse field: Influence of randomness on quantum phase transition will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-77458