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

Abstract

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 $g^{\ast }{\mu }_{B}B>k_B{T}_K,k_{B}T$.

4 pages

References in corpus (3)

• The Low-Temperature Fate of the 0.7 Structure in a Point Contact: A Kondo-like Correlated State in an Open System
• Charge Distribution in a Kondo Correlated Quantum Dot
• The anomalous 0.5 and 0.7 conductance plateaus in quantum point contacts

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