A realistic quantum capacitance model for quantum Hall edge state based Fabry-P\'{e}rot interferometers
Abstract
In this work, the classical and the quantum capacitances are calculated for a Fabry-P\'{e}rot interferometer operating in the integer quantized Hall regime. We first consider a rotationally symmetric electrostatic confinement potential and obtain the widths and the spatial distribution of the insulating (incompressible) circular strips using a charge density profile stemming from self-consistent calculations. Modelling the electrical circuit of capacitors composed of metallic gates and incompressible/compressible strips, we investigate the conditions to observe Aharonov-Bohm (quantum mechanical phase dependent) and Coulomb Blockade (capacitive coupling dependent) effects reflected in conductance oscillations. In a last step, we solve the Schr\"odinger and the Poisson equations self-consistently in a numerical manner taking into account realistic experimental geometries. We find that, describing the conductance oscillations either by Aharanov-Bohm or Coulomb Blockade strongly depends on sample properties also other than size, therefore, determining the origin of these oscillations requires further experimental and theoretical investigation.
Cite
@article{arxiv.1610.03197,
title = {A realistic quantum capacitance model for quantum Hall edge state based Fabry-P\'{e}rot interferometers},
author = {O. Kilicoglu and D. Eksi and A. Siddiki},
journal= {arXiv preprint arXiv:1610.03197},
year = {2016}
}