Yang-Lee Circle Theorem for an Antiferromagnetic Heisenberg Ladder

Chin. Phys. Lett.

2001, Vol. 18

Issue (7): 953-954 DOI:

Original Articles

Yang-Lee Circle Theorem for an Antiferromagnetic Heisenberg Ladder

WANG Xian-Zhi

Department of Physics, Shanghai Jiao Tong University, Shanghai 200030

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WANG Xian-Zhi 2001 Chin. Phys. Lett. 18 953-954

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Abstract The Yang-Lee zeros of an antiferromagnetic Heisenberg ladder model are determined. It is found that if J₄ ≤ 0 Yang-Lee zeros are located on the unit circle and on the negative real axis in the complex activity plane. In particular, if J₄ ≤ 0 and 2J₂ ≥ J₄, Yang-Lee zeros are located on the unit circle and Yang-Lee circle theorem is valid. If J₄ > 0, Yang Lee zeros are locted on some complicated curves.

Keywords: 64.60.Cn 75.10.Hk 75.10.Jm

Published: 01 July 2001

PACS:	64.60.Cn	(Order-disorder transformations)
	75.10.Hk	(Classical spin models)
	75.10.Jm	(Quantized spin models, including quantum spin frustration)

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2001/V18/I7/0953

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