Research in Engineering and Aviation

Imaging a Two-Dimensional Electron System in a Quantizing Magnetic Field


Author(s): I. J. Maasilta, S. Chakraborty, I. Kuljanishvili, S. H. Tessmer, and M. R. Melloch

Journal: Phys. Rev. B, 68, 205328, 2003. DOI: 10.1016/S1386-9477(02)01072-X


We have applied a scanning probe method, Subsurface Charge Accumulation (SCA) imaging, to resolve the local structure of the interior of a semiconductor two-dimensional electron system (2DES) in a tunneling geometry. Near magnetic fields corresponding to integer Landau level filling, submicron scale spatial structure in the out-of-phase component of the tunneling signal becomes visible. In the images presented here, the structure repeats itself when the filling factor is changed from nu=6 to nu=7. Therefore, we believe the images reflect small modulations in the 2DES density caused by the disorder in the sample.