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

Yigal Meir, Kenji Hirose, Ned S. Wingreen

Research output: Contribution to journalArticle

210 Scopus citations

Abstract

Experiments on quantum point contacts have highlighted an anomalous conductance plateau around [Formula presented], 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 [Formula presented] are dominated by different valence transitions. This accounts for the high residual conductance above [Formula presented]. 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.

Original languageEnglish (US)
JournalPhysical review letters
Volume89
Issue number19
DOIs
StatePublished - Jan 1 2002

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Kondo Model for the “0.7 Anomaly” in Transport through a Quantum Point Contact'. Together they form a unique fingerprint.

  • Cite this