title: Probing the potential landscape inside a two-dimensional electron Gas
abstract: We report direct observations of the scattering potentials in a two-dimensional electron gas using electron-beam diffraction experiments. The diffracting objects are local density fluctuations caused by spatial and charge-state distribution of donors in the GaAs-(Al,Ga)As heterostructures. The scatterers can be manipulated externally by sample illumination or by cooling the sample down under depleted conditions.
authors.affiliation: Physikalisches Institut, Universitat Wurzburg, Am Hubland, 97074 Wurzburg, Germany.
authors.initials: JJ
authors.lastname: Koonen
authors.initials: H
authors.lastname: Buhmann
authors.initials: LW
authors.lastname: Molenkamp