Two scattering models are investigated in quasi-ballistic quantum point contact systems; a model with a few point scattering centers versus the Anderson model with on-site disorder. An exact, recursive Green's function calculation is performed to obtain magneto-transport properties. We show that, in the quasi-ballistic regime, the two models are not equivalent. The Anderson model can reproduce the same fluctuation amplitude as the "few-scatterer" model, but fails to reproduce the correlation field, since the characteristic trajectory sizes are different in the two models.
- Non-universal conductance fluctuations
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering