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TT: Fachverband Tiefe Temperaturen

TT 6: Topological Semimetals

TT 6.3: Vortrag

Montag, 27. März 2023, 10:00–10:15, HSZ 304

Finite-size effects in a two-dimensional non-symmorphic wallpaper group lattice — •Miguel Ángel Jiménez Herrera¹ and Dario Bercioux^1,2 — ¹Donostia International Physics Center, 20018 San Sebastian, Spain — ²IKERBASQUE, Basque Foundation for Science, Euskadi Plaza, 5, 48009 Bilbao, Spain

We investigate the spectral properties of a two-dimensional electronic lattice belonging to the non-symmorphic wallpaper group: the herringbone lattice. Specifically, we focus on the cases of ribbons and flakes geometry. Within a tight-binding description, we study how the different states localize inside the system both for ribbons and flakes. We apply different perturbations and symmetry breaking distortions to the lattice and investigate the robustness of the spectral features. Similarly to the bulk case, where we can gap the band structure or merge the Dirac cones into semi-Dirac cones [1], we recover the same properties along the two main directions that ribbons can be constructed. Finally, we study the finite size effects on this lattice, both on ribbon and flake geometries, and report a spectral flow of states across the bulk-like bands.

[1] Herrera & Bercioux, arXiv:2209.11653.