TY - GEN T1 - Distinguishing impurity concentrations in GaAs and AlGaAs, using very shallow undoped heterostructures T2 - arXiv PY - 2010/07/06 AU - Mak WY AU - Gupta KD AU - Beere HE AU - Farrer I AU - Sfigakis F AU - Ritchie DA ED - Y2 - 2024/09/20 ER -