Coupled valence band dispersions and the quantum defect of excitons in Cu2O
| Autor: | Dietmar Fröhlich, Florian Schöne, P. Grünwald, Manfred Bayer, J. Heckötter, Marc Aßmann, Stefan Scheel, Heinrich Stolz, Johannes Thewes, Sjard-Ole Krüger |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Angular momentum Condensed matter physics Absorption spectroscopy business.industry Exciton Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics 010305 fluids & plasmas Quantum defect Semiconductor Excited state Electric field 0103 physical sciences 010306 general physics business Biexciton |
| Zdroj: | Journal of Physics B: Atomic, Molecular and Optical Physics. 49:134003 |
| ISSN: | 1361-6455 0953-4075 |
| DOI: | 10.1088/0953-4075/49/13/134003 |
| Popis: | Recent high-resolution absorption spectroscopy on highly excited excitons in cuprous oxide (Kazimierczuk et al 2014 Nature 514 343–347) have revealed significant deviations of their spectrum from the ideal hydrogen-like series. In atomic physics, the influence of the ionic core and the resulting modifications of the Coulomb interaction are accounted for by the introduction of a quantum defect. Here we translate this concept to the realm of semiconductor physics and show how the complex band dispersion of a crystal is mirrored in a set of empirical parameters similar to the quantum defect in atoms. Experimental data collected from high-resolution absorption spectroscopy in electric fields allow us to compare results for multiple angular momentum states of the yellow and even the green exciton series of . The agreement between theory and experiment validates our assignment of the quantum defect to the nonparabolicity of the band dispersion. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|