Detecting transition radiation from a magnetic moment

Igor P. Ivanov, Dmitry V. Karlovets

    Research output: Contribution to journalArticle

    26 Citations (Scopus)

    Abstract

    Electromagnetic radiation can be emitted not only by particle charges but also by magnetic moments and higher electric and magnetic multipoles. However, experimental proofs of this fundamental fact are extremely scarce. In particular, the magnetic moment contribution has never been observed in any form of polarization radiation. Here, we propose to detect it using vortex electrons carrying large orbital angular momentum ℓ. The relative contribution of the orbital angular momentum-induced magnetic moment, ℓâ.,ω/E e, becomes much larger than the spin-induced contribution â.,ω/Ee, and it can be observed experimentally. As a particular example, we consider transition radiation from vortex electrons obliquely incident on an interface between a vacuum and a dispersive medium, in which the magnetic moment contribution manifests itself via a left-right angular asymmetry. For electrons with Ee=300 keV and ℓ=100-1000, we predict an asymmetry of the order of 0.1%-1%, which could be measured with existing technology. Thus, vortex electrons emerge as a new tool in the physics of electromagnetic radiation.

    Original languageEnglish
    Article number264801
    JournalPhysical Review Letters
    Volume110
    Issue number26
    DOIs
    Publication statusPublished - 26 Jun 2013

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    magnetic moments
    vortices
    radiation
    electromagnetic radiation
    electrons
    angular momentum
    asymmetry
    orbitals
    multipoles
    vacuum
    physics
    polarization

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Detecting transition radiation from a magnetic moment. / Ivanov, Igor P.; Karlovets, Dmitry V.

    In: Physical Review Letters, Vol. 110, No. 26, 264801, 26.06.2013.

    Research output: Contribution to journalArticle

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