One-dimensional topological edge states of bismuth bilayersopen access
- Authors
- Drozdov, Ilya K.; Alexandradinata, A.; Jeon, Sangjun; Nadj-Perge, Stevan; Ji, Huiwen; Cava, R.J.; Bernevig, B.Andrei; Yazdani, Ali
- Issue Date
- Aug-2014
- Publisher
- Nature Publishing Group
- Citation
- Nature Physics, v.10, no.9, pp 664 - 669
- Pages
- 6
- Journal Title
- Nature Physics
- Volume
- 10
- Number
- 9
- Start Page
- 664
- End Page
- 669
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/59307
- DOI
- 10.1038/NPHYS3048
- ISSN
- 1745-2473
1745-2481
- Abstract
- The hallmark of a topologically insulating state of matter in two dimensions protected by time-reversal symmetry is the existence of chiral edge modes propagating along the perimeter of the sample. Among the first systems predicted to be a two-dimensional topological insulator are bilayers of bismuth. Here we report scanning tunnelling microscopy experiments on bulk Bi crystals that show that a subset of the predicted Bi-bilayers' edge states are decoupled from the states of the substrate and provide direct spectroscopic evidence of their one-dimensional nature. Moreover, by visualizing the quantum interference of edge-mode quasi-particles in confined geometries, we demonstrate their remarkable coherent propagation along the edge with scattering properties consistent with strong suppression of backscattering as predicted for the propagating topological edge states. © 2014 Macmillan Publishers Limited. All rights reserved.
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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