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Observing broken inversion symmetry in solids using two-color high-order harmonic spectroscopy

Tran Trung Luu and Hans Jakob Wörner
Phys. Rev. A 98, 041802(R) – Published 11 October 2018
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Abstract

We experimentally investigate the manifestations of broken inversion symmetry in solids in two-color interferometric measurements. Polarization-resolved, high-order harmonic spectra of SiO2 with different levels of crystallinity are obtained. In amorphous and polycrystalline SiO2, both even and odd harmonics of the two-color interferogram beat four times per fundamental period, which is similar to what was observed in atomic gases or nonoriented molecules. In contrast, when a crystalline SiO2 sample is utilized, the competition between the contributions of broken inversion symmetries of the medium and the incident electric field results in a distinctive feature: Both odd and even harmonics beat two times per fundamental period [as predicted in Phys. Rev. B 94, 115164 (2016)]. Our observations are explained by an intuitive model. Moreover, they are fully supported by numerical simulations based on semiclassical transport theory. Our experiments highlight the considerable potential of polarimetry in two-color interferometric measurements, which allow pure and unambiguous characterization of the complex polarization response and thus consequent studies of electron dynamics in solids.

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  • Received 18 April 2018

DOI:https://doi.org/10.1103/PhysRevA.98.041802

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & OpticalNonlinear Dynamics

Authors & Affiliations

Tran Trung Luu* and Hans Jakob Wörner

  • Laboratorium für Physikalische Chemie, ETH Zürich, 8093 Zürich, Switzerland

  • *trung.luu@phys.chem.ethz.ch

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Issue

Vol. 98, Iss. 4 — October 2018

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