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arXiv quant-ph/0602091quant-phcond-mat.other
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Berry相与量子相变

Berry Phases and Quantum Phase Transitions

Alioscia Hamma

摘要:

研究了一般量子多体系统的Berry相与量子相变之间的联系。考虑与极限为点的参数空间中的循环序列相关联的Berry相位序列。如果Berry相序列不收敛于零,则极限点是量子临界点。量子临界点与绝热性失效有关。我们讨论了横向磁场中各向异性XY自旋链的显著例子,并探测到临界XX区。

英文摘要:

We study the connection between Berry phases and quantum phase transitions of generic quantum many-body systems. Consider sequences of Berry phases associated to sequences of loops in the parameter space whose limit is a point. If the sequence of Berry phases does not converge to zero, then the limit point is a quantum critical point. Quantum critical points are associated to failures of adiabaticity. We discuss the remarkable example of the anisotropic XY spin chain in a transverse magnetic field and detect the XX region of criticality.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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