Fabrication of large addition energy quantum dots in graphene

Details Fabrication of large addition energy quantum dots in graphene Fabrication of large addition energy quantum dots in graphene

2009-09-17

arxiv.org/abs/0909.3278v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Improved version. To appear in Applied Physics Letters

Scientific paper

We present a simple technique to fabricate graphene quantum dots in a cryostat. It relies upon the controlled rupture of a suspended graphene sheet subjected to the application of a large electron current. This results in the in-situ formation of a clean and ultra-narrow constriction, which hosts one quantum dot, and occasionally a few quantum dots in series. Conductance spectroscopy indicates that individual quantum dots can possess an addition energy as large as 180 meV and a level spacing as large as 25 meV. Our technique has several assets: (i) the dot is suspended, thus the electrostatic influence of the substrate is reduced, and (ii) contamination is minimized, since the edges of the dot have only been exposed to the vacuum in the cryostat.

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