Phys. Rev. Lett. 97, 166802 (2006) [4 pages]Quantum Criticality in a Double-Quantum-Dot SystemReceived 17 July 2006; published 17 October 2006 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 common belief, the corresponding fixed point is robust against particle-hole and various other asymmetries and is unstable only to charge transfer between the two dots. We propose an experimental setup 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. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.166802
DOI:
10.1103/PhysRevLett.97.166802
PACS:
73.21.La, 03.65.Vf, 03.65.Yz
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