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.
@article{arxiv.cond-mat/0206346,
title = {Tunneling images of a 2D electron system in a quantizing magnetic field},
author = {I. J. Maasilta and Subhasish Chakraborty and I. Kuljanishvili and S. H. Tessmer and M. R. Melloch},
journal= {arXiv preprint arXiv:cond-mat/0206346},
year = {2009}
}
Comments
2 pages, 2 color figures, submitted to LT23 proceedings