Thermal entanglement in molecular spin rings

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

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.

Keywords: thermal entanglement molecular spin ring concurrence

Received: 06 September 2009
Revised: 06 July 2010
Accepted manuscript online:

PACS:	75.10.Jm	(Quantized spin models, including quantum spin frustration)
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)

Fund: Project supported by the Teaching and Research Foundation for the Outstanding Young Faculty of Southeast University, China.

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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 2010 Chin. Phys. B 19 110313

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