One-Dimensional Edge States with Giant Spin Splitting in a Bismuth Thin Film

Abstract

To realize a one-dimensional (1D) system with strong spin-orbit coupling is a big challenge in modern physics, since the electrons in such a system are predicted to exhibit exotic properties unexpected from the 2D or 3D counterparts, while it was difficult to realize genuine physical properties inherent to the 1D system. We demonstrate the first experimental result that directly determines the purely 1D band structure by performing spin-resolved angle-resolved photoemission spectroscopy of Bi islands on a silicon surface that contains a metallic 1D edge structure with unexpectedly large Rashba-type spin-orbit coupling suggestive of the nontopological nature. We have also found a sizable out-of-plane spin polarization of the 1D edge state, consistent with our first-principles band calculations. Our result provides a new platform to realize exotic quantum phenomena at the 1D edge of the strong spin-orbit-coupling systems.

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• Transport in two-dimensional topological materials: recent developments in experiment and theory
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• 2D and 3D topological phases in BiTe$X$ compounds
• Long-lived Andreev states as evidence for protected hinge modes in a bismuth nanoring Josephson junction
• Edge States of α-Bismuthene Nanostructures
• Giant Spin-Orbit-Induced Spin Splitting in Bi Chains on GaAs(110)
• STM observation of the hinge-states of bismuth nanocrystals
• Strong and Weak Three-Dimensional Topological Insulators Probed by Surface Science Methods
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• Fermi level tuning of one-dimensional giant Rashba system on a semiconductor substrate: Bi/GaSb(110)-(2x1)
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