摘要Ground-state (GS) properties of the two-dimensional (2D) quantum compass model in an external field on a square 5×5 lattice are investigated by using the exact diagonalization (ED) method. We obtain the GS energy and evaluate quantities such as its correlation functions, nearest-neighbor entanglement and local order parameter. As the external field is presented, the first-order quantum phase point is absent and the system exhibits the behaviors of the second-order phase transition.
Abstract：Ground-state (GS) properties of the two-dimensional (2D) quantum compass model in an external field on a square 5×5 lattice are investigated by using the exact diagonalization (ED) method. We obtain the GS energy and evaluate quantities such as its correlation functions, nearest-neighbor entanglement and local order parameter. As the external field is presented, the first-order quantum phase point is absent and the system exhibits the behaviors of the second-order phase transition.
(Entanglement measures, witnesses, and other characterizations)
引用本文:
SUN Ke-Wei**;CHEN Qing-Hu
. Ground-State Behavior of the Quantum Compass Model in an External Field[J]. 中国物理快报, 2011, 28(9): 97502-097502.
SUN Ke-Wei**, CHEN Qing-Hu
. Ground-State Behavior of the Quantum Compass Model in an External Field. Chin. Phys. Lett., 2011, 28(9): 97502-097502.
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