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Tunable Superlattice in Graphene To Control the Number of Dirac Points

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arxiv 1309.4653 v1 pith:6RP7SLWI submitted 2013-09-18 cond-mat.mes-hall

Sudipta Dubey , Vibhor Singh , Ajay K. Bhat , Pritesh Parikh , Sameer Grover , Rajdeep Sensarma , Vikram Tripathi , K. Sengupta
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Mandar M. Deshmukh
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classification cond-mat.mes-hall
keywords superlatticegraphenebanddiracstructurelateralnumberpoints
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Superlattice in graphene generates extra Dirac points in the band structure and their number depends on the superlattice potential strength. Here, we have created a lateral superlattice in a graphene device with a tunable barrier height using a combination of two gates. In this Letter, we demonstrate the use of lateral superlattice to modify the band structure of graphene leading to the emergence of new Dirac cones. This controlled modification of the band structure persists up to 100 K.

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