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

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

2008-04-04

arxiv.org/abs/0804.0805v2

Phys. Rev. B 78, 153304 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, published in PRB

Scientific paper

10.1103/PhysRevB.78.153304

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.

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