Bayer, Tim and Gräfing, Daniela and Kerbstadt, Stefanie and Pengel, Dominik and Eickhoff, Kevin and Englert, Lars and Wollenhaupt, Matthias
(2019)
Time-resolved 3D imaging of ultrafast spin–orbit wave packet dynamics.
New Journal of Physics, 21 (3).
033001.
ISSN 1367-2630
Abstract
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Paper • The following article is OPEN ACCESS
Time-resolved 3D imaging of ultrafast spin–orbit wave packet dynamics
Tim Bayer, Daniela Gräfing, Stefanie Kerbstadt, Dominik Pengel, Kevin Eickhoff, Lars Englert and Matthias Wollenhaupt
Published 13 March 2019 • © 2019 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft
New Journal of Physics, Volume 21, March 2019
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Abstract
We combine bichromatic polarization pulse shaping with photoelectron imaging tomography for time-resolved spatial imaging of ultrafast spin–orbit wave packet (SOWP) dynamics in atoms. Polarization-shaped two-color pump-probe sequences are generated by spectral amplitude and phase modulation of a femtosecond input pulse and used to excite SOWPs in the potassium $4p$ fine-structure doublet. By selecting different spectral bands for pump and probe pulse, we achieve interference-free detection of the spatiotemporal SOWP dynamics. Using tomographic techniques, we reconstruct the three-dimensional photoelectron momentum distribution (3D-ED) created by the probe pulse. Time-resolved measurement of the 3D-ED reveals the orbital realignment dynamics induced by spin–orbit interaction in the neutral atom.
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