Electric control of tunneling energy in graphene double dots

Abstract

We theoretically investigate the spectrum of a single electron double quantum dot, defined by top gates in a graphene with a substrate induced gap. We examine the effects of electric and magnetic fields on the spectrum of localized states, focusing on the tunability of the inter-dot coupling. We find that the substrate induced gap allows for electrostatic control, with some limitations that for a fixed inter-dot distance, the inter-dot coupling can not be made arbitrarily small due to the Klein tunneling. On the other hand, the proximity of the valence band in graphene allows for new regimes, such as an $npn$ double dot, which have no counterparts in GaAs.

7 pages, 11 figures, minor changes reflecting referee reports and proofs

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Cited by in corpus (3)

• Coupling two distant double quantum dots to a microwave resonator
• Electric field control of the indirect magnetic coupling through a short graphene nanoribbon
• Kondo induced π-phase shift of microwave photons in a circuit quantum electrodynamics architecture