Pseudomorphic high electron mobility transistor channel sheet charge measured by photoluminescence - Parsons, C. A.; Kim, M. H.; Quinn, W. E.; Herrmann, H. B.; Swirhun, S. E.; Brierley, S. K. (American Institute of Physics (AIP), 1994)
http://dx.doi.org/10.1063/1.357800
Keywords: U