Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 16: Graphene: Transport (Joint session of DS, HL and TT, organized by HL)

HL 16.2: Vortrag

Montag, 7. März 2016, 15:15–15:30, H17

Landau Quantization in Twisted Bilayer Graphene — •Johannes C. Rode, Dmitri Smirnov, Christopher Belke, Hennrik Schmidt, and Rolf J. Haug — Institut für Festkörperphysik, Leibniz Universität Hannover

The bandstructure of bilayer graphene is highly sensitive to rotational mismatch between layers. At large angles, the twisted bilayer effectively behaves like two decoupled monolayers, while the dispersions merge in low-energy van Hove singurities for small interlayer twist[1]. Whereas the regime of large rotational mismatch has been extensively studied in transport experiments[2], there have been few reports on small angle samples[3,4] and none for the transition between the two angular regimes so far. We here examine the magnetotransport behavior across this transition, closing the gap in experimental evidence. The results are discussed with respect to theory[5] and and under special consideration of gate-induced layer asymmetries.

[1] Lopes dos Santos, J. M. B., Perez, N. M. R., Castro Neto, A. H.

Phys. Rev. Lett. 99, 25682.

[2] Schmidt, H. et al. Appl. Phys. Lett. 93, 172108.

[3] Schmidt, H., Rode, J. C., Smirnov, D., and Haug, R. J.

Nat. Commun. 5, 5742.

[4] Lee, D. et al. Phys. Rev. Lett. 107, 216602.

[5] de Gail, R., Goerbig, M. O., Guinea, F., Montambaux, G.,

Castro Neto, A. H. Phys. Rev. B 84, 045436.