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Chiral high-harmonic generation and spectroscopy on solid surfaces using polarization-tailored strong fields.

Tobias Heinrich1, Marco Taucer2, Ofer Kfir1,3

  • 14th Physical Institute-Solids and Nanostructures, University of Göttingen, Göttingen, Germany.

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|June 18, 2021
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Summary
This summary is machine-generated.

We demonstrate circularly-polarized high-harmonic generation for ultrafast spectroscopy of chiral electronic properties at surfaces. This method reveals structural helicity and magnetic order in solids with femtosecond resolution.

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Area of Science:

  • Condensed matter physics
  • Ultrafast spectroscopy
  • Strong-field physics

Background:

  • Strong-field methods offer advanced nonlinear spectroscopy in solids.
  • Solid-state media allow control over high-harmonic generation (HHG).

Purpose of the Study:

  • To merge strong-field methods and HHG control for surface spectroscopy.
  • To demonstrate circularly-polarized HHG for probing chiral electronic properties.

Main Methods:

  • Utilizing polarization-matched excitation fields for circularly-polarized HHG.
  • Applying the technique to silicon-dioxide and magnesium oxide surfaces.

Main Results:

  • Successfully generated circularly-polarized high harmonics from solid samples.
  • Demonstrated sensitivity to structural helicity and surface magnetic order.
  • Established a new spectroscopic tool for chiral properties.

Conclusions:

  • Circularly polarized HHG adds chirality detection to strong-field spectroscopy in solids.
  • This technique provides femtosecond resolution for ultrafast dynamics of surfaces and thin films.