Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 41: Topological Semimetals
TT 41.10: Talk
Wednesday, March 11, 2026, 12:00–12:15, HSZ/0103
Anomalous Fractional Chiral Currents in Step Edges of Weyl Semimetals — •Oskar Schweizer1, Virginia Gali1, Piet Brouwer1, Gal Lemut1, Adam Yanis Chaou2, and Maxim Breitkreiz1 — 1Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany — 2Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Spain
Bulk-boundary correspondence predicts surface states in Weyl semimetals (WSM) only when the 3d bulk Weyl-node separation projects nontrivially onto a given 2d surface. However recent experiments report states on surfaces where no such protected modes are expected, localized instead to 1d step-edge defects. We study such WSM surfaces with step edges and find chiral currents bound to the steps, even though the surface itself hosts no protected modes. Remarkably, these currents can take fractional, non-integer values determined solely by the bulk Weyl-node separation.
Keywords: Weyl semimetals; bulk-boundary correspondance; topology; anomalous hall effect; defects