Journal Article

PUBDB-2021-00461

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Orbital angular momentum superposition states in transmission electron microscopy and bichromatic multiphoton ionization

Eickhoff, K. ; Rathje, C. ; Köhnke, D. ; Kerbstadt, S.CFEL*DESY* ; Englert, L. ; Bayer, T. ; Schäfer, S. ; Wollenhaupt, M. (Corresponding author)Extern*

2020
IOP [London]

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Please use a persistent id in citations: doi:10.1088/1367-2630/abbe54  doi:10.3204/PUBDB-2021-00461

Abstract: The coherent control of electron beams and ultrafast electron wave packet dynamics have attracted significant attention in electron microscopy as well as in atomic physics. In order to unify the conceptual pictures developed in both fields, we demonstrate the generation and manipulation of tailored electron orbital angular momentum (OAM) superposition states either by employing customized holographic diffraction masks in a transmission electron microscope or by atomic multiphoton ionization utilizing pulse-shaper generated carrier-envelope phase stable bichromatic ultrashort laser pulses. Both techniques follow similar physical mechanisms based on Fourier synthesis of quantum mechanical superposition states allowing the preparation of a broad set of electron states with uncommon symmetries. We describe both approaches in a unified picture based on an advanced spatial and spectral double slit and point out important analogies. In addition, we analyze the topological charge and discuss the control mechanisms of the free-electron OAM superposition states. Their generation and manipulation by phase tailoring in transmission electron microscopy and atomic multiphoton ionization is illustrated on a 7-fold rotationally symmetric electron density distribution.

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Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. DFG project 281310165 - Abbildung chemischer Dynamik mittels laserinduzierter Elektronenbeugung im Molekülkoordinatensystem (281310165) (281310165)

Experiment(s):

1. Experiments at CFEL

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