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Imprinting photon orbital angular momentum during laser-assisted photoemission from quantum wells

 
: Wätzel, Jonas; Blättermann, Alexander; Schulz, Dominik; Chiang, Chengtien; Berakdar, Jamal

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Optics Letters 45 (2020), No.21, pp.5970-5973
ISSN: 0146-9592
ISSN: 1539-4794
English
Journal Article
Fraunhofer IPM ()
ultrafast optics; energy transfer; laser modes; light field; quantum wells; time resolved spectroscopy

Abstract
We study theoretically the transfer of the light field orbital angular momentum (OAM) to propagating electrons upon photoemission from quantum well states. Irradiation with a Laguerre–Gaussian mode laser pulse elevates the quantum well state into a laser-dressed Volkov state that can be detected in an angular and energy-resolved manner while varying the characteristics of the driving fields. We derive the photoemission cross section for this process using the S-matrix theory and illustrate how the OAM is embodied in the photoelectron angular pattern with the aid of numerical calculations. The results point to a new type of time-resolved spectroscopy, in which the electronic orbital motion is addressed exclusively, with the potential for a new insight in spin-orbitally or orbitally coupled systems.

: http://publica.fraunhofer.de/documents/N-618124.html