Anisotropic spin gaps in BiAg${}_2$-Ag/Si(111)

Abstract

We present a detailed analysis of the band structure of the BiAg${}_2$/Ag/Si(111) trilayer system by means of high resolution Angle Resolved Photoemission Spectroscopy (ARPES). BiAg2/Ag/Si(111) exhibits a complex spin polarized electronic structure due to giant spin-orbit interactions. We show that a complete set of constant energy ARPES maps, supplemented by a modified nearly free electron calculation, provides a unique insight into the structure of the spin polarized bands and spin gaps. We also show that the complex gap structure can be continuously tuned in energy by a controlled deposition of an alkali metal.

6 pages, 5 figures

References in corpus (8)

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Cited by in corpus (2)

• In-plane Hall effect in two-dimensional helical electron systems
• Interaction induced staggered spin-orbit order in two-dimensional electron gas