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论文类型： 期刊论文

发表时间： 2008-02-01

发表刊物： EUROPEAN PHYSICAL JOURNAL D

收录刊物： SCIE

卷号： 46

期号： 2

页面范围： 345-349

ISSN号： 1434-6060

摘要： The Landau-Zener (LZ) transition of a two-level system coupling to spin chains near their critical points is studied in this paper. Two kinds of spin chains, the Ising spin chain and XY spin chain, are considered. We calculate and analyze the effects of system-chain coupling on the LZ transition. A relation between the LZ transition and the critical points of the spin chain is established. These results suggest that LZ transitions may serve as the witnesses of criticality of the spin chain. This may provide a new way to study quantum phase transitions as well as LZ transitions.