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Temperature dependent deviations from ideal quantization of plateau conductances in GaAs quantum point contacts | | A.E. Hansen
; A. Kristensen
; H. Bruus
; | | Date: |
23 Aug 2002 | | Subject: | Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall | | Abstract: | We present detailed experimental studies of the temperature dependence of the plateau conductance of GaAs quantum point contacts in the temperature range from 0.3 K to 10 K. Due to a strong lateral confinement produced by a shallow-etching technique we are able to observe the following unexpected feature: a linear temperature dependence of the measured mid-plateau conductance. We discuss an interpretation in terms of a temperature dependent, intrinsic series resistance, due to non-ballistic effects in the 2D-1D transition region. These results have been reproduced in several samples from different GaAs/GaAlAs heterostructures and observed in different experimental set-ups. | | Source: | arXiv, cond-mat/0208452 | | Services: | Forum | Review | PDF | Favorites | |
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