Research in Engineering and Aviation

Tunneling Images of a 2D Electron System in a Quantizing Magnetic Field

May 2003

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

Journal:  Physica E: Low-dimensional Systems and Nanostructures, 18(1-3): pp.167-168, 2003. DOI: 10.1016/S1386-9477(02)01072-X


We have applied a scanning probe method, subsurface charge accumulation 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 ν=6 to 7. Therefore, we believe the images reflect small modulations in the 2DES density caused by the disorder in the sample.