Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 55: Graphene and 2D Materials (joint session TT/HL)
HL 55.6: Vortrag
Donnerstag, 20. März 2025, 16:15–16:30, H33
Quantum transport in graphene-based Chern mosaics — •Patrick Wittig1, Fernando Dominguez1,2, and Patrik Recher1,3 — 1Institute of Mathematical Physics, TU Braunschweig, 38106 Braunschweig, Germany — 2Faculty of Physics and Astrophysics and Würzburg-Dresden Cluster of Excellence ct.qmat, University of Würzburg, 97074 Würzburg, Germany — 3Laboratory of Emerging Nanometrology, 38106 Braunschweig, Germany
Chern mosaics [1] are systems composed of domains with different Chern numbers within the bulk of the material. Here, the difference in the Chern number between neighboring domains leads to the emergence of chiral boundary modes that propagate along their interface. In our research, we construct a phenomenological scattering network theory based on the symmetries of the system to model the propagation of these chiral modes in triangular and kagome lattice structures, which can arise in graphene-based systems with characteristic valley-chiral edge modes. In particular, we investigate effects such as energy-dependent scattering [2] and spin-orbit coupling [3] within these networks to analyze the spectrum and transport properties.
[1] S. Grover et al., Nat. Phys. 18, 885 (2022).
[2] P. Wittig et al., Phys. Rev. B 108, 085431 (2023).
[3] P. Wittig et al., Phys. Rev. B 109, 245429 (2024).
Keywords: graphene; scattering network; Chern number; kagome; spin-orbit