Ballistic Transport in Graphene Antidot Lattices

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• 作者：Andreas Sandner ; Tobias Preis ; Christian Schell ; Paula Giudici ; Kenji Watanabe ; Takashi Taniguchi ; Dieter Weiss ; Jonathan Eroms
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：December 9, 2015
• 年：2015
• 卷：15
• 期：12
• 页码：8402-8406
• 全文大小：351K
• ISSN：1530-6992

文摘

The bulk carrier mobility in graphene was shown to be enhanced in graphene鈥揵oron nitride heterostructures. However, nanopatterning graphene can add extra damage and drastically degrade the intrinsic properties by edge disorder. Here we show that graphene embedded into a heterostructure with hexagonal boron nitride (hBN) on both sides is protected during a nanopatterning step. In this way, we can prepare graphene-based antidot lattices where the high mobility is preserved. We report magnetotransport experiments in those antidot lattices with lattice periods down to 50 nm. We observe pronounced commensurability features stemming from ballistic orbits around one or several antidots. Due to the short lattice period in our samples, we can also explore the boundary between the classical and the quantum transport regime, as the Fermi wavelength of the electrons approaches the smallest length scale of the artificial potential.