TY  - JOUR
AU  - Larocque, Hugo
AU  - Bouchard, Frédéric
AU  - Grillo, Vincenzo
AU  - Sit, Alicia
AU  - Frabboni, Stefano
AU  - Dunin-Borkowski, Rafal
AU  - Padgett, Miles J.
AU  - Boyd, Robert W.
AU  - Karimi, Ebrahim
TI  - Nondestructive Measurement of Orbital Angular Momentum for an Electron Beam
JO  - Physical review letters
VL  - 117
IS  - 15
SN  - 1079-7114
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2017-01258
SP  - 154801
PY  - 2016
AB  - Free electrons with a helical phase front, referred to as “twisted” electrons, possess an orbital angular momentum (OAM) and, hence, a quantized magnetic dipole moment along their propagation direction. This intrinsic magnetic moment can be used to probe material properties. Twisted electrons thus have numerous potential applications in materials science. Measuring this quantity often relies on a series of projective measurements that subsequently change the OAM carried by the electrons. In this Letter, we propose a nondestructive way of measuring an electron beam’s OAM through the interaction of this associated magnetic dipole with a conductive loop. Such an interaction results in the generation of induced currents within the loop, which are found to be directly proportional to the electron’s OAM value. Moreover, the electron experiences no OAM variations and only minimal energy losses upon the measurement, and, hence, the nondestructive nature of the proposed technique.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000385341900015
C6  - pmid:27768337
DO  - DOI:10.1103/PhysRevLett.117.154801
UR  - https://juser.fz-juelich.de/record/827052
ER  -