Anisotropic charge Kondo effect in a triple quantum dot

Abstract

We predict that an anisotropic charge Kondo effect appears in a triple quantum dot, when the system has two-fold degenerate ground states of (1,1,0) and (0,0,1) charge configurations. Using bosonization and refermionization methods, we find that at low temperature, the system has the two different phases of massive charge fluctuations between the two charge configurations and vanishing fluctuations, which are equivalent with the Kondo-screened and ferromagnetic phases of the anisotropic Kondo model, respectively. The phase transition is identifiable by electron conductance measurement, offering the possibility of experimentally exploring the anisotropic Kondo model. Our charge Kondo effect has similar origin to that in a negative-U Anderson impurity.

5 pages, 2 figures

References in corpus (10)

• The numerical renormalization group method for quantum impurity systems
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• Kondo effect in quantum dots
• Many Body Effects on the Transport Properties of Single-Molecule Devices
• Two path transport measurements on a triple quantum dot
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Cited by in corpus (1)

• Full counting statistics and shot noise of cotunneling in quantum dots and single-molecule transistors