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A: Fachverband Atomphysik

A 5: Atomic systems in external fields

A 5.6: Vortrag

Montag, 23. März 2015, 15:45–16:00, C/kHS

Exciton-phonon coupling in external fields — •Frank Schweiner, Jörg Main, and Günter Wunner — 1. Institut für Theoretische Physik, 70550 Stuttgart, Germany

Starting from the most simple description of an exciton as being a hydrogen-like system we construct an interaction Hamiltonian in first quantization, which describes a coupling of the exciton to acoustic and optical phonons. This is done using the descriptions of deformation potential coupling and Fröhlich interaction already known from electron-phonon interaction. By numerical investigation of the coupled system we try to reproduce a broadening of the lines of the hydrogen-like spectrum, which has recently been observed in experiments of the group of Fröhlich on cuprous oxide for quantum numbers up to n=25 (T. Kazimierczuk, Nature 514, 343, 2014). A further inclusion of external electric and magnetic fields shall prove the existence of exceptional points in the spectra.