Second Harmonic Generation of cuprous oxide in magnetic fields
| Autor: | Dietmar Fröhlich, Dmitri R. Yakovlev, Patric Rommel, Andreas Farenbruch, Christoph Uihlein, Manfred Bayer, Jörg Main, J. Mund |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Exciton Oxide Second-harmonic generation FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetic field chemistry.chemical_compound symbols.namesake chemistry Electric field 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) symbols 010306 general physics 0210 nano-technology Hamiltonian (quantum mechanics) |
| DOI: | 10.48550/arxiv.2002.12064 |
| Popis: | Recently Second Harmonic Generation (SHG) for the yellow exciton series in cuprous oxide has been demonstrated [J. Mund et al., Phys. Rev. B 98, 085203 (2018)]. Assuming perfect $O_{\mathrm{h}}$ symmetry, SHG is forbidden along certain high-symmetry axes. Perturbations can break this symmetry and forbidden transitions may become allowed. We investigate theoretically the effect of external magnetic fields on the yellow exciton lines of cuprous oxide. We identify two mechanisms by which an applied magnetic field can induce a second harmonic signal in a forbidden direction. First of all, a magnetic field by itself generally lifts the selection rules. In the Voigt configuration, an additional magneto-Stark electric field appears. This also induces certain SHG processes differing from those induced by the magnetic field alone. Complementary to the manuscript by A. Farenbruch et al. [Phys. Rev. B, submitted], we perform a full numerical diagonalization of the exciton Hamiltonian including the complex valence band structure. Numerical results are compared with experimental data. Comment: 14 pages, 6 figures |
| Databáze: | OpenAIRE |
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