Quantum nonlocality of Heisenberg XX model with Site-dependent Coupling Strength
arXiv:quant-ph/0311146 · doi:10.1088/0305-4470/37/47/016
Abstract
We show that the generalized Bell inequality is violated in the extended Heisenberg model when the temperature is below a threshold value. The threshold temperature values are obtained by constructing exact solutions of the model using the temperature-dependent correlation functions. The effect due to the presence of external magnetic field is also illustrated.
10 pages and 2 figures, published version