@article{article, title  = {{Distinguishing impurity concentrations in GaAs and AlGaAs using very shallow undoped heterostructures}},

 publisher = {{AIP Publishing}},

 url = {{}},

 year = {{2010}},

 month = {{12}},

 author = {{Mak WY and Das Gupta K and Beere HE and Farrer I and Sfigakis F and Ritchie DA}},

 doi = {{10.1063/1.3522651}},

 volume = {{97}},

 journal = {{Applied Physics Letters}},

 issue = {{24}},

 pages = {{242107-242107}},

 note = {{Accessed on 2024/09/20}}}