From mesoscopic magnetism to the anomalous 0.7 conductance plateau

Details From mesoscopic magnetism to the anomalous 0.7 conductance plateau From mesoscopic magnetism to the anomalous 0.7 conductance plateau

2000-02-22

arxiv.org/abs/cond-mat/0002338v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages RevTex, with 4 ps figures

Scientific paper

We present a simple phenomenological model which offers a unifying interpretation of the experimental observations on the 0.7 conductance anomaly of quantum point contacts. The model utilizes the Landauer-Buttiker formalism and involves enhanced spin correlations and thermal depopulation of spin subbands. In particular our model can account for the plateau value 0.7 and the unusual temperature and magnetic field dependence. Furthermore it predicts an anomalous suppression of shot noise at the 0.7 plateau.

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