Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1999-02-09
Phys. Rev. B 60, 7756 (1999)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 3 figures
Scientific paper
10.1103/PhysRevB.60.7756
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.
Bächtold W.
Ensslin Klaus
Gossard Arthur. C.
Heinzel Thomas
Homan O. J.
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