0.4 and 0.7 conductance anomalies in quantum point contacts

Self-consistent modelling based on local spin-density formalism is employed to calculate the conductance of quantum point contacts at finite temperatures. The total electrostatic potential exhibits spin-dependent splitting, which persists at temperatures up to 0.5 K and gives rise to the anomalies a...

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Bibliographic Details
Published in:Nanotechnology 2007-05, Vol.18 (18), p.185403-185403 (5), Article 185403
Main Authors: Bychkov, A M, Stace, T M
Format: Article
Language:English
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Summary:Self-consistent modelling based on local spin-density formalism is employed to calculate the conductance of quantum point contacts at finite temperatures. The total electrostatic potential exhibits spin-dependent splitting, which persists at temperatures up to 0.5 K and gives rise to the anomalies at 0.4 and 0.7 of the conductance quantum (2e2/h) occurring simultaneously in the absence of external magnetic fields.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/18/18/185403