Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 16: Focus Session: Oxide Semiconductors for Novel Devices III

HL 16.13: Vortrag

Dienstag, 2. April 2019, 12:45–13:00, H34

Influence of strain on yellow excitons in cuprous oxide with different principle quantum numbers — •Patric Rommel¹, Christoph Uihlein², and Jörg Main¹ — ¹Institut für Theoretische Physik 1, Universität Stuttgart, Germany — ²Experimentelle Physik 2, TU Dortmund, Germany

Recently J. Mund et al. demonstrated Second Harmonic Generation (SHG) for the yellow series in cuprous oxide [1]. Assuming perfect O_h symmetry, SHG is forbidden along certain high-symmetry axes. Perturbations can break this symmetry and forbidden transitions may become allowed. We investigate the effect of strain in the crystal structure on the yellow exciton lines of cuprous oxide. Strain in a high-symmetry direction of the crystal leads to a splitting of the exciton lines according to the related symmetry reduction [2]. For the S states of symmetry Γ₅⁺, this splitting can be described using a simple 3 × 3 matrix model. We derive the strengths of the splitting in dependence on the main quantum number n by numerically diagonalizing the exciton Hamiltonian including an appropriate strain term.

[1] J. Mund et al., Phys. Rev. B 98, 085203 (2018)

[2] H.-R. Trebin et al., Phys. Rev. B. 23, 597 (1981)