TY  - JOUR
AU  - Grillo, Vincenzo
AU  - Tavabi, Amir H.
AU  - Venturi, Federico
AU  - Larocque, Hugo
AU  - Balboni, Roberto
AU  - Gazzadi, Gian Carlo
AU  - Frabboni, Stefano
AU  - Lu, Peng-Han
AU  - Mafakheri, Erfan
AU  - Bouchard, Frédéric
AU  - Dunin-Borkowski, Rafal
AU  - Boyd, Robert W.
AU  - Lavery, Martin P. J.
AU  - Padgett, Miles J.
AU  - Karimi, Ebrahim
TI  - Measuring the orbital angular momentum spectrum of an electron beam
JO  - Nature Communications
VL  - 8
SN  - 2041-1723
CY  - London
PB  - Nature Publishing Group
M1  - FZJ-2017-06636
SP  - 15536 -
PY  - 2017
AB  - Electron waves that carry orbital angular momentum (OAM) are characterized by a quantized and unbounded magnetic dipole moment parallel to their propagation direction. When interacting with magnetic materials, the wavefunctions of such electrons are inherently modified. Such variations therefore motivate the need to analyse electron wavefunctions, especially their wavefronts, to obtain information regarding the material’s structure. Here, we propose, design and demonstrate the performance of a device based on nanoscale holograms for measuring an electron’s OAM components by spatially separating them. We sort pure and superposed OAM states of electrons with OAM values of between −10 and 10. We employ the device to analyse the OAM spectrum of electrons that have been affected by a micron-scale magnetic dipole, thus establishing that our sorter can be an instrument for nanoscale magnetic spectroscopy
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000401961300001
C6  - pmid:28537248
DO  - DOI:10.1038/ncomms15536
UR  - https://juser.fz-juelich.de/record/837859
ER  -