Hyperfine-induced valley mixing and the spin-valley blockade in carbon-based quantum dots - Condensed Matter > Mesoscale and Nanoscale PhysicsReportar como inadecuado




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Abstract: Hyperfine interaction HFI in carbon nanotube and graphene quantum dots isdue to the presence of 13C atoms. We theoretically show that in thesestructures the short-range nature of the HFI gives rise to a coupling betweenthe valley degree of freedom of the electron and the nuclear spin, in additionto the usual electron spin-nuclear spin coupling. We predict that this propertyof the HFI affects the Pauli blockade transport in carbon-based double quantumdots. In particular, we show that transport is blocked only if both the spinand the valley degeneracies of the quantum dot levels are lifted, e.g., by anappropriately oriented magnetic field. The blockade is caused by four-supertriplet- states in the 1,1 charge configuration.



Autor: András Pályi, Guido Burkard

Fuente: https://arxiv.org/







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