[We-A2-C] Optical and Quantum Phenomena in Semiconductor Nanostructures

11:45 AM - 12:00 PM JST(2:45 AM - 3:00 AM UTC)

[We-A2-C-04] Direct Observation of Fröhlich Polaron Formation in Polar Semiconductor Nanoplatelets

Jochen Feldmann¹, 〇M. Kestler¹, K.C. Woo², J. Lim², L. Prins¹, Z.H. Loh² (1. Photonics and Optoelectronics, Nano-Institute Munich and Department of Physics, Ludwig-Maximilians-University (LMU), Munich (Germany), 2. School of Chemistry, Chemical Engineering and Biotechnology, and School of Physical and Mathematical Sciences, Nanyang Technological University (NTU), Singapore (Singapore))

We report on the experimental observation of large polaron formation in time- and momentum-resolved photoemission electron microscopy (PEEM) experiments after pulsed (50 fs) photoexcitation of BiOI nanoplatelets. A doubling of the effective mass and a decrease of the conduction-band energy nicely follow Fröhlich's theoretical predictions.