Second harmonic generation on the yellow 1S exciton in Cu2O in symmetry-forbidden geometries

Johannes Mund, Christoph Uihlein, Dietmar Fröhlich, Dmitri R. Yakovlev, and Manfred Bayer
Phys. Rev. B 99, 195204 – Published 21 May 2019

Abstract

We observe optical second harmonic generation (SHG) on the 1S exciton resonance of the yellow exciton series in Cu2O in four crystal directions ([001], [1¯10],[112¯], and [111]). For light with the k-vector parallel [001] and [1¯10], SHG is symmetry forbidden in an ideal crystal according to band structure. We explain the observation of SHG signals in the forbidden geometries by local strain inducing splitting and mixing of the 1S components. Experimental data and a microscopic theory confirm that this effect observed on the 1S exciton requires a relatively long exciton lifetime. The SHG signals of excitons with principal quantum number n2 are compliant with selection rules derived by group theory from the symmetry of an unstrained crystal.

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  • Received 8 April 2019

DOI:https://doi.org/10.1103/PhysRevB.99.195204

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Johannes Mund1, Christoph Uihlein1, Dietmar Fröhlich1, Dmitri R. Yakovlev1,2, and Manfred Bayer1,2

  • 1Experimentelle Physik 2, Technische Universität Dortmund, D-44221 Dortmund, Germany
  • 2Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia

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Issue

Vol. 99, Iss. 19 — 15 May 2019

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