Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 3: Atomic systems in external fields I

A 3.3: Vortrag

Montag, 29. Februar 2016, 11:45–12:00, f303

Excitonic spectra in high external fields — •Frank Schweiner, Jörg Main, and Günter Wunner — 1. Institut für Theoretische Physik, 70550 Stuttgart, Germany

To understand and interpret excitonic absorption spectra of real semiconductors it is indispensable to incorporate the complete valence-band structure into a quantitative theory. Very recently the zero field splitting of states with different angular momentum quantum number has been investigated for cuprous oxide and successfully explained by effects due to the complexity of the valence band structure [1]. Solving the Schrödinger equation in a complete basis and determining the eigenvalues for high principal quantum numbers, we now want to investigate the spectra in external fields quantitatively.

In a recent preprint [2] quantum chaos and GUE statistics were observed for excitons in high magnetic fields. The GUE statistics has been attributed to the interaction of excitons and phonons. Neglecting the effect of the band structure but considering the movement of the center of mass of the exciton, we also want to solve the corresponding hydrogen-like Schrödinger equation and investigate the effect of phonons on the spectra qualitatively to find out whether GUE statistics appears.

[1] J. Thewes et al, Phys. Rev. Lett. 115, 027402, 2015

[2] M. Aßmann et al, Quantum Chaos of Rydberg excitons, to be published