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arXiv quant-ph/0402154quant-phnlin.CD
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狄拉克方程的Zitterbewegung和半经典观测量

Zitterbewegung and semiclassical observables for the Dirac equation

Jens Bolte, Rainer Glaser

摘要:

在半经典背景下,我们研究了自旋为1/2的相对论粒子在外场中运动的Zitterbewegung。它表明,类似的Zitterbewegung一般可观的可以删除到任意阶的\hbar通过投影到动力学几乎不变的子空间的量子力学希尔伯特空间与粒子和反粒子。这不仅允许识别具有半经典意义的观测量,而且还可以恢复平移和自旋自由度的组合经典动力学。最后,我们讨论了Dirac-Hamilton算子的本征旋量投影到几乎不变子空间时的性质,包括量子遍历现象。

英文摘要:

In a semiclassical context we investigate the Zitterbewegung of relativistic particles with spin 1/2 moving in external fields. It is shown that the analogue of Zitterbewegung for general observables can be removed to arbitrary order in \hbar by projecting to dynamically almost invariant subspaces of the quantum mechanical Hilbert space which are associated with particles and anti-particles. This not only allows to identify observables with a semiclassical meaning, but also to recover combined classical dynamics for the translational and spin degrees of freedom. Finally, we discuss properties of eigenspinors of a Dirac-Hamiltonian when these are projected to the almost invariant subspaces, including the phenomenon of quantum ergodicity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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