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TT: Fachverband Tiefe Temperaturen
TT 74: Topological Insulators
TT 74.7: Vortrag
Donnerstag, 12. März 2026, 11:15–11:30, CHE/0091
Topological fragility and bilinear magneto-resistance in spin-momentum locked edge states — •Cosimo Gorini1, Matthieu Bard2, and Giovanni Vignale3 — 1SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, Gif sur Yvette, France — 2Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405 Orsay, France — 3Institute for Functional Intelligent Materials, National University of Singapore
Time-reversal symmetric and topologically non-trivial electronic systems generally host one-dimensional (1D) spin-momentum locked states at their edges/hinges. Such 1D states are in principle fully protected against backscattering, and thus referred to as perfectly conducting: disorder cannot induce backscattering -- not even via spin-orbit coupling -- unless time-reversal is broken. We show however that such protection hides a remarkable fragility, yielding a bilinear magneto-resistance much stronger than in standard 2D systems. The mechanism we propose is fundamental and general, being based on spin-orbit interaction with the ever-present disordered background. It should thus be relevant in any system hosting 1D Dirac-like states with linear dispersion. Our theory compares favourably with transport measurements in high-order topological hinge states in Bi.
Keywords: HIgher order topological phases; Quantum transport; Bilinear magneto-resistance