Gate voltage effects in capacitively coupled quantum dots

Abstract

We study a system of two symmetrical capacitively coupled quantum dots, each coupled to its own metallic lead, focusing on its evolution as a function of the gate voltage applied to each dot. Using the numerical renormalization group and poor man's scaling techniques, the low-energy Kondo scale of the model is shown to vary significantly with the gate voltage, being exponentially small when spin and pseudospin degrees of freedom dominate; but increasing to much larger values when the gate voltage is tuned close to the edges of the Coulomb blockade staircase where low-energy charge-fluctuations also enter, leading thereby to correlated electron physics on energy/temperature scales more accessible to experiment. This range of behaviour is also shown to be manifest strongly in single-particle dynamics and electron transport through each dot.

8 pages, 3 figures

References in corpus (8)

• Transport Coefficients of the Anderson Model via the Numerical Renormalization Group
• SU(4) Fermi Liquid State and Spin Filtering in a Double Quantum Dot System
• Probing spin and orbital Kondo effects with a mesoscopic interferometer
• Quantum phase transition in capacitively coupled double quantum dots
• Interference in interacting quantum dots with spin
• Orbital and spin Kondo effects in a double quantum dot
• Renormalization group study of capacitively coupled double quantum dots
• Dynamics of capacitively coupled double quantum dots

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• Two-channel Kondo physics in odd impurity chains
• Analysis of low energy response and possible emergent SU(4) Kondo state in a double quantum dot
• Conditions for observing emergent SU(4) symmetry in a double quantum dot
• Restoring the SU(4) Kondo regime in a double quantum dot system
• Spin-orbital and spin Kondo effects in parallel coupled quantum dots
• A local moment approach to the degenerate Anderson impurity model
• Thermoelectric properties of a double quantum dot out of equilibrium in Kondo and intermediate valence regimes
• Capacitive interactions and Kondo effect tuning in double quantum impurity systems
• Universal conductance enhancement and reduction of the two-orbital Kondo effect