Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2000-12-12
J.Phys.Cond.Mat.13,3831(2001)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 3 figures
Scientific paper
10.1088/0953-8984/13/17/303
The temperature dependence of the conductance of a quantum point contact has been measured. The conductance as a function of the Fermi energy shows temperature-independent fixed points, located at roughly multiple integers of $e^{2}/h$. Around the first fixed point at e$^{2}$/h, the experimental data for different temperatures can been scaled onto a single curve. For pure thermal smearing of the conductance steps, a scaling parameter of one is expected. The measured scaling parameter, however, is significantly larger than 1. The deviations are interpreted as a signature of the potential landscape of the quantum point contact, and of the source-drain bias voltage. We relate our results phenomenologically to the metal-insulator transition in two dimensions.
Bichler Martin
Ensslin Klaus
Heinzel Thomas
Held Rowena
Ihn Thomas
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