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TT: Fachverband Tiefe Temperaturen

TT 59: 2D Materials V – Magnetic, spintronic, and topological properties (joint session HL/TT)

TT 59.5: Vortrag

Mittwoch, 11. März 2026, 16:30–16:45, POT/0081

Berry Phase Shift in Folded Bilayer Graphene — •Hannes Kakuschke, Lina Bockhorn, and Rolf J. Haug — Institut für Festkörperphysik, Leibniz Universität Hannover, 30167 Hannover, Germany

Mono- and bilayer systems of graphene have been extensively researched due to their unique magnetic und electronic transport properties. In more recent works, folded graphene [1-5] has gained interest as a platform for topological phenomena, such as zero-line modes [4]. However, these systems rely on self-assembled folded graphene, found by chance during exfoliation or induced by tearing [1-5]. Our dry-transfer approach allows us to fold graphene around hBN in a controllable manner, decoupling the overlapping graphene regions. In these samples, we observe a Berry phase shift from 2π to π near the edge of folded bilayer graphene, attributed to local strain fields and stacking shifts.

[1] J. C. Rode et al., Ann. Phys. 529, 1700025 (2017).

[2] J. C. Rode et al., 2D Mater. 6, 015021 (2018).

[3] L. Bockhorn et al., Appl. Phys. Lett. 118, 173101 (2021).

[4] S. J. Hong et al., 2D Materials 8, 045009 (2021).

[5] S. J. Hong et al., Phys. Rev. B 105, 205404 (2022).

Keywords: Folded Graphene; Berry Phase; Magnetotransport; Dry Transfer