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Peter Blake: Graphene and Boron Nitride hybrid structures

posted 8 Aug 2011, 06:48 by Peter Bøggild
Graphene and hexagonal boron nitride (hBN) are certainly interesting materials in their own rights, but combinations of the two can be more appealing. For example, when hBN is used as a substrate for graphene instead of silicon oxide, carrier mobilities increase 10-fold, giving mean free paths of over 1μm at room temperature. In double layer graphene devices, hBN can serve as an ultra-thin insulator between the two graphene layers - isolating them electrically, but allowing the layers to remain coupled via Coulomb interactions. Such hBN/graphene heterostructures may allow a variety of phenomena including exciton condensation.

This talk will describe the optical and Raman signatures [1] used for identifying mono- & few-layer hBN flakes and the subsequent steps for fabricating graphene/hBN devices. We will look at transport results from these devices that show a range of effects including tunnelling, micrometer-scale ballistic transport [2] and Coulomb drag.

[1] Gorbachev et al., Hunting for Monolayer Boron Nitride: Optical and Raman Signatures, Small (2011), http://dx.doi.org/10.1002/smll.201001628
[2] Mayorov et al., Micrometer-Scale Ballistic Transport in Encapsulated Graphene at Room Temperature, Nano Letters (2011), http://dx.doi.org/10.1021/nl200758b

Peter Blake is the Managing Director of Graphene Industries and a postdoctoral researcher in the Condensed Matter Physics Group at the University of Manchester. Since 2004, he has been studying the optical & electronic properties of graphene and developing related micro-fabrication procedures. He is currently exploring potential uses of graphene for transparent conductive coating and membrane applications.