Physics – Quantum Physics
Scientific paper
2004-12-07
Physics
Quantum Physics
5 pages, 4 figures. Contributed paper to the MQC2 conference, Naples 2004
Scientific paper
We study the field dependence of the entanglement of formation in anisotropic S=1/2 antiferromagnetic chains and two-leg ladders displaying a T=0 field-driven quantum phase transition. The analysis is carried out via Quantum Monte Carlo simulations. At zero temperature the entanglement estimators show abrupt changes at and around criticality, vanishing below the critical field, in correspondence with an exactly factorized state, and then immediately recovering a finite value upon passing through the quantum phase transition. At the quantum critical point, a deep minimum in the pairwise-to-global entanglement ratio shows that multi-spin entanglement is strongly enhanced; moreover this signature represents a novel way of detecting the quantum phase transition of the system, relying entirely on entanglement estimators.
Fubini Andrea
Haas Stephan
Roscilde Tommaso
Tognetti Valerio
Verrucchi Paola
No associations
LandOfFree
Entanglement in quantum critical spin systems 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 in quantum critical spin systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Entanglement in quantum critical spin systems will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-77474