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Instantons and phase transition in quantum interference
Si, TY; Si, TY , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
2006
发表期刊JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL
ISSN0305-4470
卷号39期号:3页码:637-647
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.
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
关键词Biaxial Spin Model Magnetization Coherence Particles
学科领域Physics
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收录类别SCI
WOS记录号WOS:000235712000015
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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/6055
专题理论物理所1978-2010年知识产出
通讯作者Si, TY , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
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Si, TY,Si, TY , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China. Instantons and phase transition in quantum interference[J]. JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL,2006,39(3):637-647.
APA Si, TY,&Si, TY , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.(2006).Instantons and phase transition in quantum interference.JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL,39(3),637-647.
MLA Si, TY,et al."Instantons and phase transition in quantum interference".JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL 39.3(2006):637-647.
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