Frequency-Dependent Transport through a Quantum Dot in the Kondo Regime

2004/06/30 by M. Sindel, W. Hofstetter, Walter Hofstetter +4 · 29 citations
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Condensed matter physics #Conductance #Coulomb #Coulomb blockade #Density matrix renormalization group #Electrical resistivity and conductivity #Electron #Fermion #Kondo effect #Physics #Quantum #Quantum and electron transport phenomena #Quantum dot #Quantum electrodynamics #Quantum mechanics #Renormalization #Resonance (particle physics) #Semiconductor Quantum Structures and Devices #Transistor #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.94.196602

published in Physical Review Letters 94(19), 196602 (American Physical Society) · 4 pages, 4 figures

openalex publication_date 2005/05/19 · arxiv created 2005/05/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We study the ac conductance and equilibrium current fluctuations of a Coulomb-blockaded quantum dot in the Kondo regime. To this end we have developed an extension of the numerical renormalization group suitable for the nonperturbative calculation of finite-frequency transport properties. We demonstrate that ac transport gives access to the many-body resonance in the equilibrium spectral density. It provides a new route for measuring this key signature of Kondo physics, which so far has defied direct experimental observation.

Citations

• Time-dependent transport in interacting and non-interacting mesoscopic systems
• Transport Coefficients of the Anderson Model via the Numerical Renormalization Group
• Many-electron singularity in X-ray photoemission and X-ray line spectra from metals
• Nonequilibrium transport through a Kondo dot: Decoherence effects
• The renormalization group: Critical phenomena and the Kondo problem