Stark effect and polarizability of graphene quantum dots

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Abstrakt

The properties of graphene quantum dots can be manipulated via lateral electric fields. Treating electrons in such structures as confined massless Dirac fermions, we derive an analytical expression for the quadratic Stark shift valid for arbitrary angular momentum and quantum dot size. Moreover, we determine the perturbative regime, beyond which higher order field effects are observed. The Dirac approach is validated by comparison with atomistic tight-binding simulations. Finally, we study the influence on the Stark effect of band gaps produced by e.g. interaction with the substrate.
OriginalsprogEngelsk
Artikelnummer115432
TidsskriftPhysical Review B
Vol/bind96
Udgave nummer11
Antal sider5
ISSN2469-9950
StatusUdgivet - 18 sep. 2017

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