2003/03/18 by Er'el Granot, E Granot · 9 citations
Chemistry · Engineering · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Conductance #Conductance quantum #Molecular Junctions and Nanostructures #Point (geometry) #Quantum and electron transport phenomena #Quantum dot #Quantum point contact #Quantum wire #Reduction (mathematics) #cond-mat.mes-hall
paper · pdf · doi:10.1209/epl/i2004-10285-3
published in Europhysics Letters (EPL) 68(6), 860-866 (Institute of Physics) · 4 pages, 4 figures (Revtex)
arxiv created 2003/03/18 · openalex publication_date 2004/11/16 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A single impurity in a quantum wire exhibits a conductance reduction. In this paper we prove (without any approximations) that for any point impurity this conduction reduction in all the subbands is exactly 2 e 2 / h . It is also shown that in the case of a surface defect, not only are the conductance minima independent of the defect characteristics, but also the transmission matrix converges to universal values. We use these calculations to discuss particle confinement between two arbitrarily weak point defects.