Abstract
The Yang-Lee zeros of an antiferromagnetic Heisenberg ladder model aredetermined. It is found that if J4⩽0 Yang-Lee zeros are locatedon the unit circle and on the negative real axis in the complex activityplane. In particular, if J4⩽0 and 2J2⩾J4, Yang-Lee zerosare located on the unit circle and the Yang-Lee circle theorem is valid. IfJ4>0, Yang-Lee zeros are located on some complicated curves.
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