Abstract
Motivated by recent development in quantum entanglement, we study relations among concurrence C, algebra, quantum phase transition and correlation length at the zero temperature for the chain. We find that at the SU(2) point, the ground state possesses the maximum concurrence. When the anisotropic parameter is deformed, however, its value decreases. Its dependence on scales as in the metallic phase and near the critical point (i.e., of the Ising-like insulating phase. We also study the dependence of C on the correlation length and show that it satisfies near the critical point. For different sizes of the system, we show that there exists a universal scaling function of C with respect to the correlation length
- Received 7 August 2003
DOI:https://doi.org/10.1103/PhysRevA.68.042330
©2003 American Physical Society