title: Spin polarisation with electron Bessel beams.
abstract: The theoretical possibility to use an electron microscope as a spin polarizer is studied. It turns out that a Bessel beam passing a standard magnetic objective lens is intrinsically spin polarized when post-selected on-axis. In the limit of infinitely small detectors, the spin polarisation tends to 100%. Increasing the detector size, the polarisation decreases rapidly, dropping below 10-4for standard settings of medium voltage microscopes. For extremely low voltages, the Figure of Merit increases by two orders of magnitude, approaching that of existing Mott detectors. Our findings may lead to new desings of spin filters, an attractive option in view of its inherent combination with the electron microscope, especially at low voltage.
authors.affiliation: Institut für Festkörperphysik, Technische Universität Wien, A-1040 Wien, Austria; USTEM, Technische Universität Wien, A-1040 Wien, Austria.
authors.forename: P
authors.initials: P
authors.lastname: Schattschneider
authors.affiliation: CNR-Istituto Nanoscienze, Centro S3, Via G Campi 213/a, I-41125 Modena, Italy; CNR-IMEM, Parco delle Scienze 37a, I-43100 Parma, Italy.
authors.forename: V
authors.initials: V
authors.lastname: Grillo
authors.affiliation: Centrale Supelec, MSSMast CNRS 8579, F-92295 Châtenay-Malabry, France.
authors.forename: D
authors.initials: D
authors.lastname: Aubry
keywords: Coherence; Spin-orbit coupling