Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 17: Rydberg atoms

A 17.6: Vortrag

Dienstag, 7. März 2017, 15:45–16:00, N 3

Magnetoexcitons in cuprous oxide — •Frank Schweiner, Jörg Main, and Günter Wunner — 1. Institut für Theoretische Physik, 70550 Stuttgart, Germany

Excitons are often regarded as the hydrogen analog of the solid state due to their hydrogen-like spectrum. In particular, excitons in cuprous oxide (Cu₂O) have recently attracted lots of attention due to the observation of giant Rydberg excitons [1].

However, the spectra of magnetoexcitons cannot be understood from a simple hydrogen-like model. We present the theory of magnetoexcitons in Cu₂O and show that it is indispensable to account for the complex valence band structure and the cubic symmetry of the solid in a quantitative theory. We especially discuss the dependence of the spectra on the direction of the external magnetic field and present a comparison of theoretical and experimental results [2].

Due to the band structure, fundamental differences between magnetoexcitons and the external fields hydrogen atom regarding the symmetry and the line statistics can be observed. While in atomic physics only GOE statistics can be observed, we show that magnetoexcitons break all antiunitary symmetries and thus show GUE statistics [3,4].

[1] T. Kazimierczuk et al, Nature 514, 343, 2014

[2] F. Schweiner et al, arXiv:1609.04275, 2016

[3] M. Aßmann et al, Nature Mater. 15, 741, 2016

[4] F. Schweiner et al, arXiv:1609.04278, 2016