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Q: Fachverband Quantenoptik und Photonik

Q 49: Poster – Photonics, Lasers, and Applications

Q 49.29: Poster

Mittwoch, 12. März 2025, 17:00–19:00, Tent

Chiral Landau Levels and Fermi-Arcs of Weyl Points under Pseudomagnetic Fields — Sachin Vaidya¹, •Alaa Bazayeed², Mikael Rechtsman³, Adolfo Grushin⁴, Marin Soljačić¹, and Christina Jörg² — ¹Department of Physics, Massachusetts Institute of Technology, Cambridge, USA — ²Physics Department and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, Germany — ³Department of Physics, The Pennsylvania State University, USA — ⁴Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, France

Weyl materials are 3D topological systems characterized by Weyl points - singularities in momentum space where two energy bands touch. These Weyl points act as monopoles of Berry curvature, giving rise to surface states known as Fermi arcs, which connect projections of opposite-chirality Weyl points. Under the application of a magnetic field, the energy bands become quantized into discrete levels known as Landau levels (LL). Due to the chirality and topology of the Weyl points, the linearly dispersing zeroth LL are also chiral. In this work, we investigate the influence of pseudo-magnetic fields (e.g., those arising from strain) on Weyl systems. These fields couple to the Weyl points in a chirality-dependent manner, such that the dispersion of all zeroth LLs share the same chirality. In this case, we find that the Fermi arcs disperse in the opposite direction and provide the opposite chirality required to satisfy the fermion doubling theorem. This system thus separates the two chiralities between the surface and the bulk. We explore this behavior in a photonic model system consisting of stacks of silicon and SiO₂ layers with controlled thickness variations.

Keywords: Weyl Semimetals; Topological Materials; Pseudo-Magnetic Fields; Fermi Arcs