Optical probing of the Coulomb interactions of an electrically pumped polariton condensate

• Main Authors: Höfling, S., Klaas, M., Mandal, Subhaskar, Liew, Timothy Chi Hin, Schneider, C., Amthor, M., Klembt, S., Worschech, L.
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2017
• Subjects: Polaritions; Exciton mediated interactions
• Online Access: https://hdl.handle.net/10356/83364; http://hdl.handle.net/10220/42546
• Institution: Nanyang Technological University

We report on optical probing of the Coulomb interactions in an electrically driven exciton-polariton laser. By positioning a weak non-resonant Gaussian continuous wave-beam with a diameter of 2 μm inside an electrical condensate excited in a 20 μm diameter micropillar, we study a repulsion effect which is characteristic of the part-excitonic nature of the microcavity system in strong coupling. It manifests itself in a modified real space distribution of the emission pattern. Furthermore, polariton repulsion results in a continuous blueshift of the emission with the increased power of the probe beam. A Gross-Pitaevskii equation approach based on modeling the electrical and optical potentials explains our experimental data.