中国物理快报  2015, Vol. 32 Issue (06): 60301-060301    DOI: 10.1088/0256-307X/32/6/060301
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Critical Behavior of the Energy Gap and Its Relation with the Berry Phase Close to the Excited State Quantum Phase Transition in the Lipkin Model
YUAN Zi-Gang1**, ZHANG Ping2
1School of Science, Beijing University of Chemical Technology, Beijing 100029
2Institute of Applied Physics and Computational Mathematics, Beijing 100088