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Phys Rev Lett. 2015 Feb 13;114(6):066402. Epub 2015 Feb 9.

One-dimensional edge states with giant spin splitting in a bismuth thin film.

Author information

1
WPI Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
2
Department of Physics, Tohoku University, Sendai 980-8578, Japan.
3
Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan.
4
WPI Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan and Department of Physics, Tohoku University, Sendai 980-8578, Japan.

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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