Kondo model for the "0.7 anomaly" in transport through a quantum point contact

Details Kondo model for the "0.7 anomaly" in transport through a quantum point contact Kondo model for the "0.7 anomaly" in transport through a quantum point contact

2002-07-01

arxiv.org/abs/cond-mat/0207044v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages

Scientific paper

10.1103/PhysRevLett.89.196802

Experiments on quantum point contacts have highlighted an anomalous conductance plateau at $0.7 (2e^2/h)$, with features suggestive of the Kondo effect. Here we present an Anderson model for transport through a point contact which we analyze in the Kondo limit. Hybridization to the band increases abruptly with energy but decreases with valence, so that the background conductance and the Kondo temperature $T_K$ are dominated by different valence transitions. This accounts for the high residual conductance above $T_K$. A spin-polarized current is predicted for Zeeman splitting $g^* \mu_B B > k_B T_K,k_BT$.

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