Quantum criticality in a double quantum-dot system

Details Quantum criticality in a double quantum-dot system Quantum criticality in a double quantum-dot system

2006-07-10

arxiv.org/abs/cond-mat/0607255v2

Phys. Rev. Lett. 97, 166802 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figs; (v2) final version as published

Scientific paper

10.1103/PhysRevLett.97.166802

We discuss the realization of the quantum-critical non-Fermi liquid state, originally discovered within the two-impurity Kondo model, in double quantum-dot systems. Contrary to the common belief, the corresponding fixed point is robust against particle-hole and various other asymmetries, and is only unstable to charge transfer between the two dots. We propose an experimental set-up where such charge transfer processes are suppressed, allowing a controlled approach to the quantum critical state. We also discuss transport and scaling properties in the vicinity of the critical point.

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