Devices exhibiting the integer quantum Hall effect can be modeled by one-particle Schrödinger operators describing the planar motion of an electron in a perpendicular, constant magnetic field, and under the influence of an electrostatic potential. The electron motion is confined to bounded or unbounded subsets of the plane by confining potential barriers. The edges of the confining potential barriers create edge currents. This is the second of two papers in which we review recent progress and prove explicit lower bounds on the edge currents associated with one- and two-edge geometries. In this paper, we study various unbounded and bounded, two-edge geometries with soft and hard confining potentials. These two-edge geometries describe the electron confined to unbounded regions in the plane, such as a strip, or to bounded regions, such as a finite length cylinder. We prove that the edge currents are stable under various perturbations, provided they are suitably small relative to the magnetic field strength, including perturbations by random potentials. The existence of, and the estimates on, the edge currents are independent of the spectral type of the operator.
|Number of pages||35|
|Journal||Annales Henri Poincare|
|State||Published - Oct 2008|
Bibliographical noteFunding Information:
1 Supported in part by NSF grant DMS-0503784. 2 also Centre de Physique Théorique, UnitéMixte de Recherche 6207 du CNRS et des Universités Aix-Marseille I, Aix-Marseille II et de l’Universitédu Sud Toulon-Var-Laboratoire affiliéà la FRUMAM, F-13288 Marseille Cedex 9, France.
ASJC Scopus subject areas
- Statistical and Nonlinear Physics
- Nuclear and High Energy Physics
- Mathematical Physics