Magnetotransport, magneto-optical, and electronic subband studies in InxGa1−xAs/In0.52Al0.48As one-side-modulation-doped asymmetric step quantum wells - Kim, T. W.; Jung, M.; Lee, D. U.; Yoo, Keon-Ho; Yoo, Kyung-Hwa (American Institute of Physics (AIP), 1996)
http://dx.doi.org/10.1063/1.117474
Keywords: U