2004/10/12 by A. I. Posazhennikova, A. Posazhennikova, P. Coleman +1 · 49 citations
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Anomaly (physics) #Condensed matter physics #Conductance #Decoupling (probability) #Electrical resistivity and conductivity #Kondo effect #Physics #Quantum #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Semiconductor materials and devices #Spin (aerodynamics) #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.94.036802
published in Physical Review Letters 94(3), 036802 (American Physical Society) · Four pages, four figures. Paper revised with additional references added in response to feedback from readers
arxiv created 2004/10/12 · openalex publication_date 2005/01/26 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We interpret the recent observation of a zero-bias anomaly in spin-1 quantum dots in terms of an underscreened Kondo effect. Although spin-1 quantum dots are expected to undergo a two-stage quenching effect, in practice the log-normal distribution of Kondo temperatures leads to a broad temperature region dominated by underscreened Kondo physics. General arguments, based on the asymptotic decoupling between the partially screened moment and the leads, predict a singular temperature and voltage dependence of the conductance G and differential conductance g, resulting in dg/dT approximately 1/T and dG/dV approximately 1/V. Using a Schwinger boson approach, we show how these qualitative expectations are borne out in a detailed many body calculation.