Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-07-26
Small 6, 1469-1473 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1002/smll.201000291
Graphene is considered to be a promising material for future electronics. The envisaged transistor applications often rely on precision cutting of graphene sheets with nanometer accuracy. In this letter we demonstrate graphene-based quantum dots created by using atomic force microscopy (AFM) with tip-assisted electrochemical etching. This lithography technique provides resolution of about 20 nm, which can probably be further improved by employing sharper tips and better humidity control. The behavior of our smallest dots in magnetic field has allowed us to identify the charge neutrality point and distinguish the states with one electron, no charge and one hole left inside the quantum dot.
Blake Peter
Freitag F.
Geim Andre K.
Giesbers J. . A. M.
Morozov Sergey V.
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