Finite-temperature conductance signatures of quantum criticality in double quantum dots

Abstract

We study the linear conductance through a double-quantum-dot system consisting of an interacting dot in its Kondo regime and an effectively noninteracting dot, connected in parallel to metallic leads. Signatures in the zero-bias conductance at temperatures $T>0$ mark a pair of quantum (T=0) phase transitions between a Kondo-screened many-body ground state and non-Kondo ground states. Notably, the conductance features become more prominent with increasing $T$, which enhances the experimental prospects for accessing the quantum-critical region through tuning of gate voltages in a single device.

4 pages, 3 figures, published in PRB

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Cited by in corpus (6)

• Fano-Kondo effect in side-coupled double quantum dots at finite temperatures and the importance of the two-stage Kondo screening
• Many-body electronic structure and Kondo properties of cobalt-porphyrin molecules
• Perfect spin polarization in T-shaped double quantum dots due to the spin-dependent Fano effect
• Tunable pseudogap Kondo effect and quantum phase transitions in Aharonov-Bohm interferometers
• Quantum phase transitions in a pseudogap Anderson-Holstein model
• The RKKY Interaction and the Nature of the Ground State of Double Dots in Parallel