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 $Tg0$ 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.
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