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arXiv 0712.3590cond-mat.mes-hallcond-mat.mtrl-sci
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磁场中石墨烯中电子的Zitterbewegung

Zitterbewegung of electrons in graphene in a magnetic field

Tomasz M. Rusin, Wlodek Zawadzki

摘要:

描述了在外部磁场存在下,石墨烯中电子的颤动运动[Zitterbewegung(ZB)]引起的电流和空间位移。考虑了石墨烯布里渊区中两个不等价的$K$点的贡献。结果表明,当电子以波包形式制备时,量子化磁场$B$的存在对ZB有非常重要的影响。(1)对于$B\neq 0$,ZB振荡是永久的,对于B=0,它们是瞬态的。(2)对于$B\neq 0$,出现许多ZB频率,对于B=0,只有一个频率起作用。(3)对于$B\neq 0$,带间和带内(回旋)频率都对ZB有贡献,对于B=0,没有带内频率。(4)磁场强度不仅改变了ZB频率,而且改变了ZB谱的整体特征。本文提出并描述了一种由颤动电子发射的电磁偶极辐射。有人认为,石墨烯在磁场是一个很有前途的系统的Zitterbewegung的实验观察。

英文摘要:

Electric current and spacial displacement due to trembling motion [Zitterbewegung (ZB)] of electrons in graphene in the presence of an external magnetic field are described. Contributions of both inequivalent $K$ points in the Brillouin zone of graphene are considered. It is shown that, when the electrons are prepared in the form of wave packets, the presence of a quantizing magnetic field $B$ has very important effects on ZB. (1) For $B\neq 0$ the ZB oscillations are permanent, for B=0 they are transient. (2) For $B\neq 0$ many ZB frequencies appear, for B=0 only one frequency is at work. (3) For $B\neq 0$ both interband and intraband (cyclotron) frequencies contribute to ZB, for B=0 there are no intraband frequencies. (4) Magnetic field intensity changes not only the ZB frequencies but the entire character of ZB spectrum. An emission of electromagnetic dipole radiation by the trembling electrons is proposed and described. It is argued that graphene in a magnetic field is a promising system for an experimental observation of Zitterbewegung.

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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