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Spin-Polarized Photoelectrons in the Vicinity of Spectral Features

Carlström, Stefanos LU ; Tahouri, Rezvan LU ; Papoulia, Asimina LU orcid ; Dahlström, Jan Marcus LU ; Ivanov, Misha Yu ; Smirnova, Olga and Patchkovskii, Serguei (2025) In Physical Review Letters 134(9).
Abstract

It has been shown by Fano [1] that photoionization of a cesium atom by a laser pulse tuned to the vicinity of a Cooper minimum generates spin-polarized electrons. Here we show that while photoionization of rare gases does not provide large spin polarization in the vicinity of the Cooper minimum, the Fano resonances yield much higher overall spin polarization (≥40%). The spin polarization increases in angle-resolved photoelectron spectra, and reaches 100% when measured in coincidence with the photoion. A common feature of both Cooper minima and Fano resonances, is the large variation of the photoinization cross section over photon energy, which proves to be vital for efficient generation of spin-polarized electrons. We provide a general... (More)

It has been shown by Fano [1] that photoionization of a cesium atom by a laser pulse tuned to the vicinity of a Cooper minimum generates spin-polarized electrons. Here we show that while photoionization of rare gases does not provide large spin polarization in the vicinity of the Cooper minimum, the Fano resonances yield much higher overall spin polarization (≥40%). The spin polarization increases in angle-resolved photoelectron spectra, and reaches 100% when measured in coincidence with the photoion. A common feature of both Cooper minima and Fano resonances, is the large variation of the photoinization cross section over photon energy, which proves to be vital for efficient generation of spin-polarized electrons. We provide a general framework for achieving spin polarization in photoionization irrespective of the ionization regime.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
134
issue
9
article number
093202
publisher
American Physical Society
external identifiers
  • scopus:86000282832
  • pmid:40131097
ISSN
0031-9007
DOI
10.1103/PhysRevLett.134.093202
language
English
LU publication?
yes
id
79695aec-c309-4da4-a0b2-7c52bd282046
date added to LUP
2025-06-11 09:02:31
date last changed
2025-06-11 09:03:18
@article{79695aec-c309-4da4-a0b2-7c52bd282046,
  abstract     = {{<p>It has been shown by Fano [1] that photoionization of a cesium atom by a laser pulse tuned to the vicinity of a Cooper minimum generates spin-polarized electrons. Here we show that while photoionization of rare gases does not provide large spin polarization in the vicinity of the Cooper minimum, the Fano resonances yield much higher overall spin polarization (≥40%). The spin polarization increases in angle-resolved photoelectron spectra, and reaches 100% when measured in coincidence with the photoion. A common feature of both Cooper minima and Fano resonances, is the large variation of the photoinization cross section over photon energy, which proves to be vital for efficient generation of spin-polarized electrons. We provide a general framework for achieving spin polarization in photoionization irrespective of the ionization regime.</p>}},
  author       = {{Carlström, Stefanos and Tahouri, Rezvan and Papoulia, Asimina and Dahlström, Jan Marcus and Ivanov, Misha Yu and Smirnova, Olga and Patchkovskii, Serguei}},
  issn         = {{0031-9007}},
  language     = {{eng}},
  number       = {{9}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Spin-Polarized Photoelectrons in the Vicinity of Spectral Features}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.134.093202}},
  doi          = {{10.1103/PhysRevLett.134.093202}},
  volume       = {{134}},
  year         = {{2025}},
}