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David Goldhaber-Gordon, Stanford University, USA

‚ÄčWhy Graphene Week?
It brings together many impressive researchers interested in graphene (of course), but within that space covers a broader range of scientific and applied topics than most workshops I attend. Other workshops might focus on electrons in low-dimensional systems, going beyond graphene but retaining a tight intellectual focus. So Graphene Week is a chance to reach a broader audience and learn about different topics in an efficient way.

What will your talk be about?
It will be about, Making and Using Beams of Electrons in Graphene. As soon as graphene was discovered, researchers began dreaming about the remarkable electron optics they might expect, including Klein tunneling and sign change in index of refraction going from n to p type regions. But until recently these remained mostly a dream, since electronic mean free paths were well below a micron. Some clever experiments tested ballistic transport on very short lengthscales. But with advances (primarily at Columbia university) in the past few years, mean free paths of tens of microns are now consistently achievable, opening up many new possibilities. I will tell about our recent progress on making narrow collimated beams, achieving mirrorlike reflection at edges, identifying scattering mechanisms that limit mean free path, and using ballistic motion to probe band structure of superlattices in exquisite detail.

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Publishing date: 16 May 2016 13:41