Kang, Y;
Pisanty, E;
Ciappina, M;
Lewenstein, M;
de Morisson Faria, CF;
Maxwell, AS;
(2021)
Conservation laws for electron vortices in strong-field ionisation.
The European Physical Journal D
, 75
(7)
, Article 199. 10.1140/epjd/s10053-021-00214-4.
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Abstract
We investigate twisted electrons with a well-defined orbital angular momentum, which have been ionised via a strong laser field. By formulating a new variant of the well-known strong field approximation, we are able to derive conservation laws for the angular momenta of twisted electrons in the cases of linear and circularly polarised fields. In the case of linear fields, we demonstrate that the orbital angular momentum of the twisted electron is determined by the magnetic quantum number of the initial bound state. The condition for the circular field can be related to the famous ATI peaks, and provides a new interpretation for this fundamental feature of photoelectron spectra. We find the length of the circular pulse to be a vital factor in this selection rule and, employing an effective frequency, we show that the photoelectron OAM emission spectra are sensitive to the parity of the number of laser cycles. This work provides the basic theoretical framework with which to understand the OAM of a photoelectron undergoing strong field ionisation.
| Type: | Article |
|---|---|
| Title: | Conservation laws for electron vortices in strong-field ionisation |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1140/epjd/s10053-021-00214-4 |
| Publisher version: | https://doi.org/10.1140/epjd/s10053-021-00214-4 |
| Language: | English |
| Additional information: | © 2021 Springer Nature Switzerland AG. This article is licensed under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10131700 |
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