Senz, V. and Heinzel, Thomas and Ihn, Thomas and Lindemann, S. and Held, R. and Ensslin, Klaus and Wegscheider, Werner and Bichler, Max (2001) Analysis of the temperature-dependent quantum point contact conductance in relation to the metal-insulator transition in two dimensions. Journal of Physics: Condensed Matter 13 (17), pp. 3831-3837.
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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 e2/h. Around the first fixed point at e2/h, the experimental data for different temperatures can be 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.
|Date:||30 April 2001|
|Institutions:||Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Werner Wegscheider|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||30 Nov 2009 13:46|
|Last Modified:||20 Jul 2011 22:09|