Nonequilibrium Critical Behavior for Electron Tunneling through Quantum Dots in an Aharonov-Bohm Circuit

Abstract

Double quantum dots can provide an experimental realization of the 2 impurity Kondo model which exhibits a non-Fermi liquid quantum critical point (QCP) at a special value of its parameters. We generalize our recent study of double quantum dots in series \cite{Sela08} to a parallel configuration with an Aharonov-Bohm flux. We present an exact universal result for the finite temperature and finite voltage conductance $G[V,T]$ along the crossover from the QCP to the low energy Fermi liquid phase. Compared to the series configuration, here generically $G[V,T]\ne G[-V,T]$, leading to current rectification.

16 pages, 11 figures

References in corpus (6)

• Universal Scaling in Non-equilibrium Transport Through a Single-Channel Kondo Dot
• Quantum criticality in a double quantum-dot system
• Quantum phase transition in a two-channel-Kondo quantum dot device
• Nonequilibrium Transport through Double Quantum Dots: Exact Results near Quantum Critical Point
• Kondo effect in coupled quantum dots with RKKY interaction: Finite temperature and magnetic field effects
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• Relevance of Anisotropy in the Kondo Effect: Lessons From the Symplectic Case