Science of Nanoscale Systems and their Device Applications
Science of Nanoscale Systems and their Device Applications
2005 Research Results

Laboratory for Integrated Science
Images of the Quantum Hall Liquid
Ray Ashoori

An SPM charging image

(a) An SPM charging image of a 2DEG in the quantum Hall regime at filling factor = 0.89. The image shows bright arcs on a dark background over the 10x10m2 field of view. (b) At this magnetic field, the positive tip bias induces a bubble of electrons in the next Landau level. A ring of incompressible states at = 1 separates the interior of the bubble from the bulk. (c) Arcs arise in the image when the ring intersects a "hotspot" in the 2DEG, causing its resistance to drop.

 

  Last Modified June 20, 2006 by the NSEC Office.