We report unprecedented evidence of a spin split one-dimensional metallic surface state for the system of Si(557)-Au obtained by means of high-resolution spin- and angle-resolved photoelectron spectroscopy combined with first principles calculations. The surface state shows double parabolic energy dispersions along the Au chain structure together with a reversal of the spin polarization with respect to the time-reversal symmetry point as is characteristic from the Rashba effect. Moreover, we have observed a considerably large out-of-plane spin polarization which we attribute to the highly anisotropic wave function of the gold chains.
@article{arxiv.1005.5450,
title = {Direct evidence of spin-split one-dimensional metallic surface state on Si(557)-Au},
author = {Taichi Okuda and Koji Miyamoto and Yasuo Takeichi and Hirokazu Miyahara and Manami Ogawa and Ayumi Harasawa and Akio Kimura and Iwao Matsuda and Akito Kakizaki and Tatsuya Shishidou and Tamio Oguchi},
journal= {arXiv preprint arXiv:1005.5450},
year = {2010}
}