Kondo Model for the “0.7 Anomaly” in Transport through a Quantum Point Contact

Yigal Meir, Kenji Hirose, and Ned S. Wingreen
Phys. Rev. Lett. 89, 196802 – Published 21 October 2002

Abstract

Experiments on quantum point contacts have highlighted an anomalous conductance plateau around 0.7(2e2/h), with features suggestive of the Kondo effect. Here, an Anderson model for transport through a point contact analyzed 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 TK are dominated by different valence transitions. This accounts for the high residual conductance above TK. The model explains the observed gate-voltage, temperature, magnetic field, and bias-voltage dependences. A spin-polarized current is predicted even for low magnetic fields.

  • Figure
  • Figure
  • Figure
  • Received 1 July 2002

DOI:https://doi.org/10.1103/PhysRevLett.89.196802

©2002 American Physical Society

Authors & Affiliations

Yigal Meir1,2,*, Kenji Hirose3, and Ned S. Wingreen1

  • 1NEC Research Institute, 4 Independence Way, Princeton, New Jersey 08540
  • 2Physics Department, Princeton University, Princeton, New Jersey 08540
  • 3Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan

  • *Permanent Address: Department of Physics, Ben-Gurion University, Beer Sheva 84105, Israel.

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 89, Iss. 19 — 4 November 2002

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×