Quantum Criticality in a Double-Quantum-Dot System

Gergely Zaránd, Chung-Hou Chung, Pascal Simon, and Matthias Vojta
Phys. Rev. Lett. 97, 166802 – Published 17 October 2006

Abstract

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.

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  • Received 17 July 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.166802

©2006 American Physical Society

Authors & Affiliations

Gergely Zaránd1,2, Chung-Hou Chung3, Pascal Simon4, and Matthias Vojta3

  • 1Institut für Theoretische Festkörperphysik, Universität Karlsruhe, D-76128 Karlsruhe, Germany
  • 2Institute of Physics, Technical University Budapest, Budapest, H-1521, Hungary
  • 3Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, D-76128 Karlsruhe, Germany
  • 4Laboratoire de Physique et Modélisation des Milieux Condensés, CNRS et Université Joseph Fourier, 38042 Grenoble, France

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Issue

Vol. 97, Iss. 16 — 20 October 2006

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