Abstract
We determine the band mobility of photoexcited electrons in cubic n-type . We measure a room-temperature mobility of that decreases monotonically to as the temperature is increased to 200 °C. We show that electrons in form large polarons. Our results are predicted by strong coupling polaron theory if the band mass of the electrons is chosen to be electron masses. We determine the electron-phonon coupling constant and effective longitudinal optical phonon frequency required for this prediction from the available infrared reflectivity spectrum of .
- Received 10 May 1996
DOI:https://doi.org/10.1103/PhysRevLett.78.891
©1997 American Physical Society