Physics – Quantum Physics
Scientific paper
2009-07-06
PHYSICAL REVIEW A 79, 052337 (2009)
Physics
Quantum Physics
4 pages, 3 figures
Scientific paper
10.1103/PhysRevA.79.052337
We show that the thermal entanglement in a spin system using only magnetic susceptibility measurements is restricted to the insulator materials. We develop a generalization of the thermal entanglement witness that allows us to get information about the system entanglement with variable local spin lengths that can be used experimentally in conductor or insulator materials. As an application, we study thermal entanglement for the half-filled Hubbard model for linear, square and cubic clusters. We note that it is the itinerancy of electrons that favors the entanglement. Our results suggest a weak dependence between entanglement and external spin freedom degrees.
Almeida Francisco A. G.
Souza Andre M. C.
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