• Letter
  • Open Access

Strong chiral dichroism and enantiopurification in above-threshold ionization with locally chiral light

Ofer Neufeld, Hannes Hübener, Angel Rubio, and Umberto De Giovannini
Phys. Rev. Research 3, L032006 – Published 6 July 2021
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Abstract

We derive here a highly selective photoelectron-based chirality-sensing technique that utilizes “locally chiral” laser pulses. We show that this approach results in strong chiral discrimination, where the standard forwards/backwards asymmetry of photoelectron circular dichroism (PECD) is lifted. The resulting dichroism is larger and more robust than conventional PECD (especially in the high-energy part of the spectrum), is found in all hemispheres, and is not symmetric or antisymmetric with respect to any symmetry operator. Remarkably, chiral dichroism of up to 10% survives in the angularly integrated above-threshold ionization (ATI) spectra, and chiral dichroism of up to 5% survives in the total ionization rates. We demonstrate these results through ab initio calculations in the chiral molecules bromochlorofluoromethane, limonene, fenchone, and camphor. We also explore the parameter space of the locally chiral field and show that the observed dichroism is strongly correlated to the degree of chirality of the light, validating it as a measure for chiral-interaction strengths. Our results pave the way for highly selective probing of ultrafast chirality in ATI and motivate the use of locally chiral light for enhancing ultrafast spectroscopies. Most importantly, the technique can be implemented to achieve all-optical enantiopurification of chiral samples.

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  • Received 2 October 2020
  • Accepted 11 June 2021

DOI:https://doi.org/10.1103/PhysRevResearch.3.L032006

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Ofer Neufeld1,2,*, Hannes Hübener1, Angel Rubio1,3, and Umberto De Giovannini1,4

  • 1Max Planck Institute for the Structure and Dynamics of Matter, Hamburg 22761, Germany
  • 2Physics Department and Solid State Institute, Technion–Israel Institute of Technology, Haifa 32000, Israel
  • 3Center for Computational Quantum Physics (CCQ), The Flatiron Institute, New York, New York 10010, USA
  • 4IKERBASQUE, Basque Foundation for Science, E-48011 Bilbao, Spain

  • *ofer.neufeld@gmail.com

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Vol. 3, Iss. 3 — July - September 2021

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