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Title: Stern-Gerlach-like approach to electron orbital angular momentum measurement

Many methods now exist to prepare free electrons into orbital-angular-momentum states, and the predicted applications of these electron states as probes of materials and scattering processes are numerous. The development of electron orbital-angular-momentum measurement techniques has lagged behind. We show that coupling between electron orbital angular momentum and a spatially varying magnetic field produces an angular-momentum-dependent focusing effect. We propose a design for an orbital-angular-momentum measurement device built on this principle. As the method of measurement is noninterferometric, the device works equally well for mixed, superposed, and pure final orbital-angular-momentum states. The energy and orbital-angular-momentum distributions of inelastically scattered electrons may be simultaneously measurable with this technique.
Authors:
 [1] ;  [2] ;  [1]
  1. Univ. of Oregon, Eugene, OR (United States). Department of Physics
  2. Univ. of Oregon, Eugene, OR (United States). Department of Physics; CNR-Istituto Nanoscienze (Italy); CNR-IMEM Parco Area delle Scienze 37/A (Italy)
Publication Date:
Grant/Contract Number:
SC0010466
Type:
Published Article
Journal Name:
Physical Review A
Additional Journal Information:
Journal Volume: 95; Journal Issue: 2; Journal ID: ISSN 2469-9926
Publisher:
American Physical Society (APS)
Research Org:
Univ. of Oregon, Eugene, OR (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Beam optics; Dichroism; Orbital angular momentum; quantum measurements; transformation optics; electrons; magnetic moment; scanning transmission electron microscopy; transmission electron microscopy; quantum information
OSTI Identifier:
1345274
Alternate Identifier(s):
OSTI ID: 1424914