Tilted potential induced coupling of localized states in a graphene nanoconstriction

A. C. Ferrari; A. Fasoli; A. Lombardo; C. G. Smith; D. Anderson; G. A. C. Jones; K. L. Chiu; M. R. Connolly

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Tilted potential induced coupling of localized states in a graphene nanoconstriction

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arxiv 1009.1103 v2 pith:2WUJMS7D submitted 2010-09-06 cond-mat.mes-hall cond-mat.mtrl-sci

M. R. Connolly , K. L. Chiu , A. Lombardo , A. Fasoli , A. C. Ferrari , D. Anderson , G. A. C. Jones , C. G. Smith This is my paper · ORCID

classification cond-mat.mes-hallcond-mat.mtrl-sci

keywords nanoconstrictioncouplinggraphenehaloslocalizedpotentialstatesable

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We use the charged tip of a low temperature scanning probe microscope to perturb the transport through a graphene nanoconstriction. Maps of the conductance as a function of tip position display concentric halos, and by following the expansion of the halos with back-gate voltage we are able to identify an elongated domain over the nanoconstriction where they originate. Amplitude modulations of the transmission resonances are correlated with the gradient of the tip-induced potential and we analyze this in terms of modified coupling between localized states.

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