Geometric discord approach to quantum phase transition in the anisotropy XY spin model

We investigate the quantum critical behavior in the anisotropy XY spin chain by means of geometric discord (D-G). Near the critical point, the key ingredients of the quantum criticality (e.g, finite-size scaling behavior, universality principle and critical exponents) are investigated carefully, and the results show that the D-G is reliable to characterize the quantum critical behavior in such system. (c) 2012 Elsevier B.V. All rights reserved.