Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 44: Optical Properties I

HL 44.4: Vortrag

Mittwoch, 9. März 2016, 10:30–10:45, H10

Quantum Defects of Excitons in Cu₂O — Florian Schöne, •Sjard Ole Krüger, Peter Grünwald, Heinrich Stolz, and Stefan Scheel — Institut für Physik, Universität Rostock, D-18059 Rostock, Germany

Recent experiments have shown a clear deviation of the yellow exciton series in Cu₂O from an ideal (hydrogen) Rydberg series [1]. We present numerical calculations for the exciton binding energies based on the nonparabolicity of the Γ₇⁺ valence band using a group theoretical band hamiltonian [2]. The momentum space Schrödinger equation has been reduced to a set of Fredholm integral equations for the radial part of the wavefunction, which could be solved numerically. Describing the deviation from a Rydberg series through quantum defects, we analyzed the influence of the valence band nonparabolicity on the exciton binding energies for angular momenta l=0,…,3.

[1] T. Kazimierczuk, D. Fröhlich, S. Scheel, H. Stolz, M. Bayer, doi:10.1038/nature13832

[2] F. Schöne, S.-O. Krüger, P. Grünwald, J. Thewes, M. Aßmann, J. Heckötter, D. Fröhlich, M. Bayer, H. Stolz, and S. Scheel, arXiv:1511.05458 [cond-mat.mes-hall].