贝塞尔光束引导下电子的特洛伊态
Trojan states of electrons guided by Bessel beams
摘要：
以前的工作[一]。Bialynicki-Birula，Phys. Rev. Lett. { \bf 93}，20402（2004）]中的方法被扩展以覆盖电磁波的更现实的例子，即贝塞尔光束。结果表明，电子可以被具有非零轨道角动量的贝塞尔光束导引。在这种波场的电磁涡线附近捕获电子的机制与圆极化波产生的里德伯电子的特洛伊态相同。其主要区别在于，在本例中，束中电子的横向运动仅限于电磁波的作用下，而不需要附加的吸引中心。我们还简要地讨论了电子在Neumann和Hankel光束中的运动。
英文摘要：
Previous work [I. Bialynicki-Birula, Phys. Rev. Lett. {\bf 93}, 20402 (2004)] is extended to cover more realistic examples of electromagnetic waves, viz. the Bessel beams. It is shown that electrons may be guided by a Bessel beam with nonvanishing orbital angular momentum. The mechanism for trapping the electrons near the electromagnetic vortex line of such a wave field is the same as for the Trojan states of Rydberg electrons produced by a circularly polarized wave. The main difference is that in the present case the transverse motion of electrons in a beam is confined under the action of the electromagnetic wave alone, no additional attraction center is required. We also discuss briefly the motion of electrons in Neumann and Hankel beams.
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