Physics – Quantum Physics
Scientific paper
2004-12-13
Phys. Rev. Lett. 94, 147208 (2005)
Physics
Quantum Physics
4 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.94.147208
Making use of exact results and quantum Monte Carlo data for the entanglement of formation, we show that the ground state of anisotropic two-dimensional S=1/2 antiferromagnets in a uniform field takes the classical-like form of a product state for a particular value and orientation of the field, at which the purely quantum correlations due to entanglement disappear. Analytical expressions for the energy and the form of such states are given, and a novel type of exactly solvable two-dimensional quantum models is therefore singled out. Moreover, we show that the field-induced quantum phase transition present in the models is unambiguously characterized by a cusp minimum in the pairwise-to-global entanglement ratio R, marking the quantum-critical enhancement of \emph{multipartite} entanglement. A detailed discussion is provided on the universality of the cusp in R as a signature of quantum critical behavior entirely based on entanglement.
Fubini Andrea
Haas Stephan
Roscilde Tommaso
Tognetti Valerio
Verrucchi Paola
No associations
LandOfFree
Entanglement and factorized ground states in two-dimensional quantum antiferromagnets 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 Entanglement and factorized ground states in two-dimensional quantum antiferromagnets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Entanglement and factorized ground states in two-dimensional quantum antiferromagnets will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-116052