Electron with orbital angular momentum in a strong laser wave; Physical Review A; Vol. 86, iss. 6

Electron with orbital angular momentum in a strong laser wave; Physical Review A; Vol. 86, iss. 6

Bibliographic Details
Parent link:Physical Review A: journal.— , 1970-
Vol. 86, iss. 6.— 2012.— P. 062102 (1-13)
Main Author: Karlovets D. V. Dmitry Valeryevich
Summary:Electrons carrying orbital angular momentum (OAM) have recently been discovered theoretically and obtained experimentally, which opens up possibilities for using them in high-energy physics. We consider such a twisted electron moving in the external field of a plane electromagnetic wave and study how this field influences the electron's OAM. Being motivated by the development of high-power lasers, we focus our attention on a classically strong-field regime for which −e2A2̅ /(me2c4)≥1. It is shown that, along with the well-known "plane-wave" Volkov solution, the Dirac equation also has the "non-plane-wave" solutions, which possess OAM and spin-orbit coupling and generalize the free-electron's Bessel states. Motion of an electron with OAM in a circularly polarized laser wave reveals a twofold character: the wave-packet center moves along a classical helical trajectory with some quantum transverse broadening (due to OAM) existing even for a free electron. Using the twisted states, we calculate the electron's total angular momentum and predict its shift in the strong-field regime, which is analogous to the well-known shifts of the electron's momentum and mass (and to a less-known shift of its spin) in intense fields. Since the electron's effective angular momentum is conserved in a plane wave, as well as in some more general field configurations, we discuss several possibilities for accelerating nonrelativistic twisted electrons by using focused and combined electromagnetic fields.
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Language:English
Published: 2012
Subjects:
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Format: Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=599541

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