Crystallographically aligned van der Waal Heterostructures of graphene and hBN

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• John Wallbank (Manchester)
• Thursday 26 October 2017, 13:45-15:00
• Theory Library.

If you have a question about this talk, please contact Mike Gunn.

The electronic properties of graphene stacked with other two-dimensional materials can be tuned, not only by the selection of materials in the stack, but also by adjusting the relative crystallographic alignment of the component layers. For graphene on a hBN underlay, this alignment produces a moiré superlattice, which results in the reconstruction of graphene’s Dirac cone into a series of superlattice minibands, and, for finite magnetic field, the formation of a fractal pattern of magnetic minibands [1,2]. I will first review some of the most interesting theoretical and experimental results for this system, before discussing how the presence of a superlattice activates both umklapp electron-electron and electron-phonon scattering and produces a dramatic decrease in the mobility of graphene’s electrons at finite temperatures. Time permitting, I will also discuss other systems in which the crystallographic alignment between layers is important, such as twisted black phosphorous stacks.

[1] J. R. Wallbank, M. Mucha-Kruczyński, Xi Chen, and V. I. Fal’ko, Ann. Phys. 5, 359 (2015). [2] M. Lee, J.R. Wallbank, P. Gallagher, K. Watanabe, T. Taniguchi, V .I. Fal’ko, and D. Goldhaber-Gordon, Science 353, 1526 (2016)

This talk is part of the Theoretical Physics Seminars series.

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