Dresden 2026 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 20: Poster I

HL 20.32: Poster

Tuesday, March 10, 2026, 18:00–20:00, P1

Electrical and optical studies of twisted graphene bilayers — •Anselm Watschke, Monica Kolek Martinez de Azagra, and Thomas Weitz — I. Physikalisches Institut, University of Goettingen

As a van der Waals heterostructure, twisted bilayer graphene shows rich angle-dependent electronic behavior, including magic-angle superconductivity [1] and near-30° interlayer decoupling [2], motivating efforts to tune its electrical properties through multiple degrees of freedom. Furthermore, in situ quantum twisting microscope measurements revealed the angle dependent tunneling current for small regions of twisted bilayer graphene [3].

In this work, we fabricated devices incorporating a locally twisted bilayer graphene region, enabling simultaneous investigation of the off-angle regime and adjacent monolayer domains. Encapsulation in hexagonal boron nitride was used to maintain the intrinsic behavior of graphene, and vibrational and electronic properties were subsequently examined through Raman spectroscopy and gate-tunable transport measurements.

[1] Cao, Y., Fatemi, V., Fang, S. et al. Nature 556, 43*50 (2018). https://doi.org/10.1038/nature26160

[2] H. Schmidt, T. Lüdtke, P. Barthold, E. McCann, V. I. Fal'ko, R. J. Haug; Appl. Phys. Lett. 27 October 2008; 93 (17): 172108. https://doi.org/10.1063/1.3012369

[3] Inbar, A., Birkbeck, J., Xiao, J. et al. Nature 614, 682*687 (2023). https://doi.org/10.1038/s41586-022-05685-y

Keywords: van der Waals materials; heterostructures; raman spectroscopy; field effect transistor