Local Moment Formation in Quantum Point Contacts

2002/11/27 by Kei Hirose, Kenji Hirose, Yigal Meir +1
Engineering · Physics and Astronomy · #Advanced Chemical Physics Studies #Condensed matter physics #Coulomb #Electron #Kondo effect #Molecular Junctions and Nanostructures #Moment (physics) #Physics #Quantum and electron transport phenomena #Quantum mechanics #Quantum point contact #Quantum well #Spin (aerodynamics) #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevlett.90.026804

10 pages, 3 figures, accepted for publication in Physical Review Letters

arxiv created 2002/11/27 · openalex publication_date 2003/01/17 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Spin-density-functional theory of quantum point contacts (QPCs) reveals the formation of a local moment with a net of one electron spin in the vicinity of the point contact-supporting the recent report of a Kondo effect in a QPC. The hybridization of the local moment to the leads decreases as the QPC becomes longer, while the on site Coulomb-interaction energy remains almost constant.

Citations

• Spin-dependent resonances in the conduction edge of quantum wires
• Possible mechanism of the fractional-conductance quantization in a one-dimensional constriction
• Self-interaction correction to density-functional approximations for many-electron systems
• Self-Consistent Equations Including Exchange and Correlation Effects