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题名: Instantons and phase transition in quantum interference
作者: Si, TY
刊名: JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL
出版日期: 2006
卷号: 39, 期号:3, 页码:637-647
关键词: BIAXIAL SPIN MODEL ;  MAGNETIZATION ;  COHERENCE ;  PARTICLES
学科分类: Physics
通讯作者: Si, TY , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
部门归属: Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
英文摘要: In the biaxial nanospin system, quantum tunnelling of the magnetization vector oscillates with increasing magnetic field or temperature. When the number of instanons is equal to the number of anti-instantons, the annihilation of instanton-anti-instanton pair results,in a vanished Berry curvature, it leads to the topological quenching point. When the number of instantons and anti-instantons is not equal, berry curvature is nonzero, this suggests that there are extra instantons that revive the tunnelling splitting. So the generation (annihilation) of instanton induced the revival (quenching) of tunnel splitting. This generation or annihilation is accompanied by different phase transitions which can be distinguished by H/H-c/1-K-2/K-1. When the system slides from the phase of H/H-c < 1-K-2/K-1 into the phase of H/H-c > 1-K-2/K-1, an instanton will be generated (annihilated), which revives (quenches) the quantum tunnelling. This conclusion also holds when phase transition occurs in the opposite direction, i.e., from H/H-c > 1-K-2/K-1 to H/H-c < 1-K-2/K-1. So there is a phase transition that occurs alternatively in the magnetic molecule system when the topological quenching of the tunnel splitting occurs quasiperiodically.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000235712000015
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/6055
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Si, TY. Instantons and phase transition in quantum interference[J]. JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL,2006,39(3):637-647.
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