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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2008

Spin-orbital Kondo decoherence by environmental effects in capacitively coupled quantum dots

Sabine Andergassen
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Serge Florens
Denis Feinberg
  • Fonction : Auteur
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Résumé

Strong correlation effects in a capacitively coupled double quantum-dot setup were previously shown to provide the possibility of both entangling spin-charge degrees of freedom and realizing efficient spin-filtering operations by static gate-voltage manipulations. Motivated by the use of such a device for quantum computing, we study the influence of electromagnetic noise on a general spin-orbital Kondo model and investigate the conditions for observing coherent, unitary transport crucial to warrant efficient spin manipulations. We find a rich phase diagram where low-energy properties sensitively depend on the impedance of the external environment and geometric parameters of the system. Relevant energy scales related to the Kondo temperature are also computed in a renormalization-group treatment, allowing us to assess the robustness of the device against environmental effects. These are minimized at low bias voltage and for highly symmetric devices concerning the geometry.

Dates et versions

hal-00262089 , version 1 (10-03-2008)

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Citer

Sabine Andergassen, Pascal Simon, Serge Florens, Denis Feinberg. Spin-orbital Kondo decoherence by environmental effects in capacitively coupled quantum dots. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2008, 77 (4), pp.045309. ⟨10.1103/PhysRevB.77.045309⟩. ⟨hal-00262089⟩
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