Entanglement in a first order quantum phase transition

Details Entanglement in a first order quantum phase transition Entanglement in a first order quantum phase transition

2003-12-04

arxiv.org/abs/cond-mat/0312130v1

Phys. Rev. A 69, 054101 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 EPS figures

Scientific paper

10.1103/PhysRevA.69.054101

The phase diagram of spins 1/2 embedded in a magnetic field mutually interacting antiferromagnetically is determined. Contrary to the ferromagnetic case where a second order quantum phase transition occurs, a first order transition is obtained at zero field. The spectrum is computed for a large number of spins and allows one to study the ground state entanglement properties which displays a jump of its concurrence at the critical point.

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