Relativistic electron vortex beams: angular momentum and spin-orbit interaction |
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Authors: | Bliokh Konstantin Y Dennis Mark R Nori Franco |
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Affiliation: | Applied Optics Group, School of Physics, National University of Ireland, Galway, Galway, Ireland. |
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Abstract: | Motivated by the recent discovery of electron vortex beams carrying orbital angular momentum (AM), we construct exact Bessel-beam solutions of the Dirac equation. They describe relativistic and nonparaxial corrections to the scalar electron beams. We describe the spin and orbital AM of the electron with Berry-phase corrections and predict the intrinsic spin-orbit coupling in free space. This can be observed as a spin-dependent probability distribution of the focused electron vortex beams. Moreover, the magnetic moment is calculated, which shows different g factors for spin and orbital AM and also contains the Berry-phase correction. |
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