本文基于笔者近年来关于钛酸钡基无铅铁电陶瓷的研究结果，阐述了 Ba（Ti0．99 Co0．01）O3－ d 无铅铁电陶瓷的综合型实验教学设计与实施．该实验条件简单，结果可靠，涉及材料物理及相关技术等多方面内容，是一类培养大学生实验能力...本文基于笔者近年来关于钛酸钡基无铅铁电陶瓷的研究结果，阐述了 Ba（Ti0．99 Co0．01）O3－ d 无铅铁电陶瓷的综合型实验教学设计与实施．该实验条件简单，结果可靠，涉及材料物理及相关技术等多方面内容，是一类培养大学生实验能力与创新能力的研究综合性实验．展开更多
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 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）.展开更多
By introducing the Dzyaloshinsky-Moriya （DM） interaction, the Loschmidt Echo （LE） of a quantum sys- tem consisting of a central spin and its surrounding environment characterized by an XY spin chain was investigat...By introducing the Dzyaloshinsky-Moriya （DM） interaction, the Loschmidt Echo （LE） of a quantum sys- tem consisting of a central spin and its surrounding environment characterized by an XY spin chain was investigated analytically and numerically. At the critical points of the magnetic field, the LE presents an obvious decay. The decay amplitude can be tuned by the DM interaction. In some specific intervals the DM interaction can remarkably delay the decay of the LE. On the other hand, the DM interaction can change the effects of the anisotropy parameter on the LE.展开更多
基金Supported by Natural Science Foundation of Shanxi Province of China (2010JM1011)Science Foundation of Xi’an University of Posts and Telecommunications(1050409)
文摘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 Scientific Research Project for Shaanxi Provincial Department of Education(12Jk0957)Science Foundation of Xi’an University of Posts and Telecommunications(1050409,1051206)
文摘By introducing the Dzyaloshinsky-Moriya （DM） interaction, the Loschmidt Echo （LE） of a quantum sys- tem consisting of a central spin and its surrounding environment characterized by an XY spin chain was investigated analytically and numerically. At the critical points of the magnetic field, the LE presents an obvious decay. The decay amplitude can be tuned by the DM interaction. In some specific intervals the DM interaction can remarkably delay the decay of the LE. On the other hand, the DM interaction can change the effects of the anisotropy parameter on the LE.
