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Experimental evidence for spin-split bands in a one-dimensional chain structure.

I Barke¹, Fan Zheng, T K Rügheimer

¹Department of Physics, University of Wisconsin Madison, 1150 University Ave., Madison, Wisconsin 53706, USA.

Physical Review Letters

|December 13, 2006

Summary

Gold atom chains on silicon surfaces show a spin splitting due to the spin-orbit interaction, also known as the Rashba effect. This finding clarifies the origin of unusual half-filled bands observed in these systems.

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Area of Science:

Surface Science
Condensed Matter Physics
Materials Science

Background:

Gold atom chains on vicinal Si(111) surfaces display a puzzling doublet of half-filled bands.
The origin of this band splitting has been a long-standing question in surface physics.

Purpose of the Study:

To elucidate the origin of the unusual half-filled bands observed in gold atom chains on vicinal Si(111) surfaces.
To experimentally verify theoretical predictions regarding electronic band structures.

Main Methods:

Angle-resolved photoemission spectroscopy was employed to probe the electronic band structure.
Experimental results were compared with theoretical predictions.

Main Results:

The observed band splitting was identified as spin splitting induced by the spin-orbit interaction (Rashba effect).

Related Experiment Videos

A characteristic pattern of avoided band crossings was observed at the superlattice zone boundary.

A minigap of 85 meV and a k-offset of 0.05 Å⁻¹ were determined at two of the four avoided crossings.

Conclusions:

The spin-orbit interaction (Rashba effect) is confirmed as the cause of the half-filled band doublet in gold atom chains on vicinal Si(111).
The findings align with theoretical predictions, offering a deeper understanding of electronic properties in low-dimensional metallic systems.