A band structure scenario for the giant spin-orbit splitting observed at the Bi/Si(111) interface

Details A band structure scenario for the giant spin-orbit splitting observed at the Bi/Si(111) interface A band structure scenario for the giant spin-orbit splitting observed at the Bi/Si(111) interface

2010-06-17

arxiv.org/abs/1006.3566v2

Physics

Condensed Matter

Materials Science

11 pages, 13 figures

Scientific paper

10.1103/PhysRevB.82.085440

The Bi/Si(111) (sqrt{3} x sqrt{3})R30 trimer phase offers a prime example of a giant spin-orbit splitting of the electronic states at the interface with a semiconducting substrate. We have performed a detailed angle-resolved photoemission (ARPES) study to clarify the complex topology of the hybrid interface bands. The analysis of the ARPES data, guided by a model tight-binding calculation, reveals a previously unexplored mechanism at the origin of the giant spin-orbit splitting, which relies primarily on the underlying band structure. We anticipate that other similar interfaces characterized by trimer structures could also exhibit a large effect.

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