1.
Phys Rev Lett
; 84(11): 2473-6, 2000 Mar 13.
Artigo
em Inglês
| MEDLINE
| ID: mdl-11018913
RESUMO
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.