| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Ground-State Behavior of the Quantum Compass Model in an External Field |
| SUN Ke-Wei1**, CHEN Qing-Hu2
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1School of Science, Hangzhou Dianzi University, Hangzhou 310018
2Department of Physics, Zhejiang University, Hangzhou 310027
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| Cite this article: |
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SUN Ke-Wei, CHEN Qing-Hu 2011 Chin. Phys. Lett. 28 097502 |
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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.
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| Keywords:
75.10.Pq
64.70.Tg
03.67.Mn
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Received: 01 January 1900
Published: 30 August 2011
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| PACS: |
75.10.Pq
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(Spin chain models)
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64.70.Tg
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(Quantum phase transitions)
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03.67.Mn
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(Entanglement measures, witnesses, and other characterizations)
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