Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-08-08
Phys. Rev. B 77, 045309 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 13 figures. Minor modifications in V2
Scientific paper
10.1103/PhysRevB.77.045309
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 to assess the robustness of the device against environmental effects.
Andergassen Sabine
Feinberg Denis
Florens Serge
Simon Pascal
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