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Straintronic devices made of carbon-based materials have been pushed up dueto the graphene high mechanical flexibility and the possibility of interestingchanges in transport properties. Properly designed strained systems have beenproposed to allow optimized transport responses that can be explored inexperimental realizations. In multi-terminal systems, comparisons betweenschemes with different geometries are important to characterize themodifications introduced by mechanical deformations, specially if thedeformations are localized at a central part of the system or extended in alarge region. Then, in the present analysis, we study the strain effects on thetransport properties of triangular and hexagonal graphene flakes, with zigzagand armchair edges, connected to three electronic terminals, formed bysemi-infinite graphene nanoribbons. Using the Green's function formalism withcircular renormalization schemes, and a single band tight-bindingapproximation, we find that resonant tunneling transport becomes relevant andis more affected by localized deformations in the hexagonal graphene flakes.Moreover, triangular systems with deformation extended to the leads, likelongitudinal three-folded type, are shown as an interesting scenario forbuilding nanoscale waveguides for electronic current.

Tuning transport properties on graphene multi-terminal structures by mechanical deformations