摘要
The effect of the three-site interaction （α） on the critical behaviors of the XY spin chain is studied in terms of the Loschmidt echo （LE）. The critical lines can be shifted by α, and the anisotropy parameter of the XY chain has no effect on the critical lines. The scaling behaviors of the LE reveal that the dynamical behaviors of the LE are reliable for characterizing quantum phase transition （QPT）.
The effect of the three-site interaction （α） on the critical behaviors of the XY spin chain is studied in terms of the Loschmidt echo （LE）. The critical lines can be shifted by α, and the anisotropy parameter of the XY chain has no effect on the critical lines. The scaling behaviors of the LE reveal that the dynamical behaviors of the LE are reliable for characterizing quantum phase transition （QPT）.
基金
Supported by Natural Science Foundation of Shanxi Province of China (2010JM1011)
Science Foundation of Xi’an University of Posts and Telecommunications(1050409)
