Regensburg 2016 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 44: Optical Properties I

HL 44.2: Talk

Wednesday, March 9, 2016, 10:00–10:15, H10

Quantum Chaos of Rydberg Excitons in Cu₂O — •Johannes Thewes, Marc Aßmann, Dietmar Fröhlich, and Manfred Bayer — Experimentelle Physik 2, Technische Universität Dortmund, D-44221 Dortmund, Germany

The yellow exciton series of Cu₂O exhibits a complex transition towards quantum chaos under the influence of an external magnetic field. The observed quadratic level repulsion in the chaotic regime indicates a non-trivial breaking of the time reversal symmetry in the system. We argue that an asymmetric scattering process with crystal phonons is the reason for the non-trivial breaking of time reversal symmetry in Cu₂O.
In a hydrogen-like system like this, the breaking of time reversal symmetry by the magnetic field itself is not sufficient to observe quadratic level repulsion. For such systems, there is still a combined symmetry operation available that leaves the system invariant. Hence, the Hamiltonian of these systems can be represented by a real and symmetric matrix which is only the prerequisite for linear level repulsion in the chaotic regime.