A pure quantum mechanical theory of parity effect in tunneling and evolution of spins
文献类型：期刊论文
| 作者 | Li, BZ ; Wu, JH ; Zhong, WD ; Pu, FC |
| 刊名 | SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY
 |
| 出版日期 | 1998 |
| 卷号 | 41期号:3页码:301 |
| 关键词 | SMALL MAGNETIC PARTICLES INTERFERENCE DISSIPATION COHERENCE |
| ISSN号 | 1006-9283 |
| 通讯作者 | Li, BZ: Chinese Acad Sci, Inst Phys, POB 603, Beijing 100080, Peoples R China. |
| 中文摘要 | In recent years, the spin parity effect in magnetic macroscopic quantum tunneling has attracted extensive attention. Using the spin coherent-state path-integral method it is shown that if the Hamiltonian (H) over cap of a single-spin system has M-fold rotational symmetry around z-axis, the tunneling amplitude (-S\e(-i (H) over cap t)\S) vanishes when S, the quantum number of spin, is not an integer multiple of M/2, where \ m) (m = -S, -S + 1,..., S) are the eigenstates of (S) over cap(z). Not only is a pure quantum mechanical approach adopted to the above result, but also is extended to more general cases where the quantum system consists of N spins, the quantum numbers of which can take any values, including the single-spin system, ferromagnetic particle and antiferromagnetic particle as particular instances, and where the states involved are not limited re the extreme ones. The extended spin parity effect is that if the Hamiltonian (H) over cap of the system of N spins also has the above symmetry, then (m'(N)...m'(2)m'(1)\e(-i (H) over cap t)\m(1)m(2)...m(N)) vanishes when Sigma(i=1)(n)(m(i)-m'(i)) is not an integer multiple of M, where \m(1)m(2)...m(N)) = Pi(a=1)(N)\m(a)] and \ m(a))] are the eigenstates of (S) over cap(a)(z). In addition, it is argued that for large spin the above result, the so-called spin parity effect, does not mean the quenching of spin tunneling from the direction of +/-z to that of -/+z. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/33186]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Li, BZ,Wu, JH,Zhong, WD,et al. A pure quantum mechanical theory of parity effect in tunneling and evolution of spins[J]. SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY,1998,41(3):301. |
| APA | Li, BZ,Wu, JH,Zhong, WD,&Pu, FC.(1998).A pure quantum mechanical theory of parity effect in tunneling and evolution of spins.SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY,41(3),301. |
| MLA | Li, BZ,et al."A pure quantum mechanical theory of parity effect in tunneling and evolution of spins".SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY 41.3(1998):301. |
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来源：物理研究所
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