From mesoscopic magnetism to the anomalous 0.7 conductance plateau

Bruus, Henrik; Cheianov, Vadim V.; Flensberg, Karsten

From mesoscopic magnetism to the anomalous 0.7 conductance plateau

Authors

Bruus, Henrik

Cheianov, Vadim V.

Flensberg, Karsten

Description

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.
4 pages RevTex, with 4 ps figures