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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
Source PublicationJOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL
KeywordBiaxial Spin Model Magnetization Coherence Particles
AbstractIn 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.
2006
ISSN0305-4470
Volume39Issue:3Pages:637-647
Subject AreaPhysics
Indexed BySCI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/6055
Collection理论物理所科研产出_SCI论文
Corresponding AuthorSi, TY , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
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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