Thermal entanglement in molecular spin rings

doi:10.1088/1674-1056/19/11/110313

中国物理B ›› 2010, Vol. 19 ›› Issue (11): 110313-110504.doi: 10.1088/1674-1056/19/11/110313

Thermal entanglement in molecular spin rings

侯净敏, 杜龙, 丁伽焱, 张文新

Department of Physics, Southeast University, Nanjing 211189, China

收稿日期:2009-09-06 修回日期:2010-07-06 出版日期:2010-11-15 发布日期:2010-11-15
基金资助:
Project supported by the Teaching and Research Foundation for the Outstanding Young Faculty of Southeast University, China.

Thermal entanglement in molecular spin rings

Hou Jing-Min(侯净敏)^†, Du Long(杜龙), Ding Jia-Yan(丁伽焱), and Zhang Wen-Xin(张文新)

Department of Physics, Southeast University, Nanjing 211189, China

Received:2009-09-06 Revised:2010-07-06 Online:2010-11-15 Published:2010-11-15
Supported by:
Project supported by the Teaching and Research Foundation for the Outstanding Young Faculty of Southeast University, China.

摘要/Abstract

摘要： The thermal entanglement in the triangular molecular spin ring with Dzyaloshinskii--Moriya interaction is studied. The concurrences of arbitrary two spins of the triangular molecular spin ring for various cases are evaluated. The tendency of the concurrence with Dzyaloshinskii--Moriya interaction and temperature is analysed and discussed. We note that the concurrence arrives at its maximum in the regime with the large Dzyaloshinskii--Moriya interaction and low temperature, and gradually decreases to zero with the increase of temperature. The concurrence has different features for the ferromagnetic and antiferromagnetic cases. For completeness, we also numerically calculate the concurrence of spin rings with N>3 spins and analyse their behaviours.

Abstract: The thermal entanglement in the triangular molecular spin ring with Dzyaloshinskii–Moriya interaction is studied. The concurrences of arbitrary two spins of the triangular molecular spin ring for various cases are evaluated. The tendency of the concurrence with Dzyaloshinskii–Moriya interaction and temperature is analysed and discussed. We note that the concurrence arrives at its maximum in the regime with the large Dzyaloshinskii–Moriya interaction and low temperature, and gradually decreases to zero with the increase of temperature. The concurrence has different features for the ferromagnetic and antiferromagnetic cases. For completeness, we also numerically calculate the concurrence of spin rings with N>3 spins and analyse their behaviours.

Key words: thermal entanglement, molecular spin ring, concurrence

中图分类号: (Quantized spin models, including quantum spin frustration)

75.10.Jm

75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)

侯净敏, 杜龙, 丁伽焱, 张文新. Thermal entanglement in molecular spin rings[J]. 中国物理B, 2010, 19(11): 110313-110504.

Hou Jing-Min(侯净敏), Du Long(杜龙), Ding Jia-Yan(丁伽焱), and Zhang Wen-Xin(张文新). Thermal entanglement in molecular spin rings[J]. Chin. Phys. B, 2010, 19(11): 110313-110504.

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Thermal entanglement in molecular spin rings

Thermal entanglement in molecular spin rings

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