Observation of backscattering induced by magnetism in the topological hinge state of bismuth
ORAL
Abstract
We have investigated the effects of time-reversal symmetry breaking on the topological hinge state of bismuth. Using spectroscopic imaging and spin-polarized measurements with an STM, we have compared quasiparticle interference (QPI) occurring in the hinge state of a pristine bismuth bilayer with that occurring in the hinge state of a bilayer, which is terminated by ferromagnetic iron clusters. Our experiments on the decorated bilayer edge reveal an additional QPI branch that can be associated with spin-flip scattering across the Brioullin zone center between time-reversal band partners. The observed QPI characteristics exactly match with theoretical expectations for a topological edge state having one Kramer's pair of bands and, thus provide spectroscopic evidence for back scattering in the topological edge states of bismuth.
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Presenters
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Berthold Jaeck
Princeton University
Authors
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Berthold Jaeck
Princeton University
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Yonglong Xie
Princeton University, Department of Physics, Harvard University, Harvard University
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Andrei Bernevig
Physics, Princeton University, Princeton Center for Theoretical Science, Princeton University, Princeton University, Department of Physics, Princeton university, Physics department, Princeton University
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Ali Yazdani
Princeton University, Joseph Henry Laboratories & Department of Physics, Princeton University, Princeton Univ, Department of Physics, Princeton University