Mode Spectroscopy and Level Coupling in Ballistic Electron Waveguides
Mesoscale and Nanoscale Physics
2009-10-31 v1
Abstract
A tunable quantum point contact with modes occupied in both transverse directions is studied by magnetotransport experiments. We use conductance quantization of the one-dimensional subbands as a tool to determine the mode spectrum. A magnetic field applied along the direction of the current flow couples the modes. This can be described by an extension of the Darwin-Fock model. Anticrossings are observed as a function of the magnetic field, but not for zero field or perpendicular field directions, indicating coupling of the subbands due to nonparabolicity in the electrical confinement.
Cite
@article{arxiv.cond-mat/9902119,
title = {Mode Spectroscopy and Level Coupling in Ballistic Electron Waveguides},
author = {G. Salis and T. Heinzel and K. Ensslin and O. J. Homan and W. Bachtold and K. Maranowski and A. C. Gossard},
journal= {arXiv preprint arXiv:cond-mat/9902119},
year = {2009}
}
Comments
4 pages, 3 figures