Chiral high-harmonic generation and spectroscopy on solid surfaces using polarization-tailored strong fields
arXiv:2010.05558 · doi:10.1038/s41467-021-23999-9
Abstract
Strong-field methods in solids enable new strategies for ultrafast nonlinear spectroscopy and provide all-optical insights into the electronic properties of condensed matter in reciprocal and real space. Additionally, solid-state media offers unprecedented possibilities to control high-harmonic generation using modified targets or tailored excitation fields. Here we merge these important points and demonstrate circularly-polarized high-harmonic generation with polarization-matched excitation fields for spectroscopy of chiral electronic properties at surfaces. The sensitivity of our approach is demonstrated for structural helicity and termination-mediated ferromagnetic order at the surface of silicon-dioxide and magnesium oxide, respectively. Circularly polarized radiation emanating from a solid sample now allows to add basic symmetry properties as chirality to the arsenal of strong-field spectroscopy in solids. Together with its inherent temporal (femtosecond) resolution and non-resonant broadband spectrum, the polarization control of high harmonics from condensed matter can illuminate ultrafast and strong field dynamics of surfaces, buried layers or thin films.
arXiv comment24 pages, 5 figures
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- Band nonlinearity-enabled manipulation of Dirac nodes, Weyl cones, and valleytronics with intense linearly polarized light
- Mapping light-dressed Floquet bands by highly nonlinear optical excitations and valley polarization
- Noncollinear phase-matching of high harmonic generation in solids
- Revealing the anisotropic charge-density-wave order of TiSe through high harmonic generation