Shallow donors and a fluctuating potential: Experiments in semi-insulating GaAs

✍ Scribed by K. Karpierz; J. Łusakowski; M.L. Sadowski; M. Grynberg

• Book ID: 103938662
• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 461 KB
• Volume: 184
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(93)90389-n

✦ Synopsis

Far-infrared magneto-optic and conductivity experiments on semi-insulating GaAs at liquid-helium temperatures were performed at magnetic fields up to 9 tesla. During the measurements the samples were persistently illuminated with infrared light which led to a nonzero stationary occupation of both shallow donor and conduction-band states. We show that the results of the experiments cannot be explained without taking into account long-range fluctuations of the electrostatic potential which arise due to the random distribution of charged centres.