A strategy to create spin-split metallic bands on silicon using a dense alloy layer
Journal
Scientific Reports
Journal Volume
4
ISSN
20452322
Date Issued
2014
Author(s)
Gruznev, Dimitry V.
Bondarenko, Leonid V.
Matetskiy, Andrey V.
Yakovlev, Alexey A.
Tupchaya, Alexandra Y.
Eremeev, Sergey V.
Chulkov, Evgeniy V.
Wei, Ching-Ming
Lai, Ming-Yu
Wang, Yuh-Lin
Zotov, Andrey V.
Saranin, Alexander A.
Abstract
To exploit Rashba effect in a 2D electron gas on silicon surface for spin transport, it is necessary to have surface reconstruction with spin-split metallic surface-state bands. However, metals with strong spin-orbit coupling (e.g., Bi, Tl, Sb, Pt) induce reconstructions on silicon with almost exclusively spin-split insulating bands. We propose a strategy to create spin-split metallic bands using a dense 2D alloy layer containing a metal with strong spin-orbit coupling and another metal to modify the surface reconstruction. Here we report two examples, i.e., alloying Bi/Si(111)√3×√3 reconstruction with Na and Tl/Si(111)1 × 1 reconstruction with Pb. The strategy provides a new paradigm for creating metallic surface state bands with various spin textures on silicon and therefore enhances the possibility to integrate fascinating and promising capabilities of spintronics with current semiconductor technology.
SDGs
Publisher
Nature Publishing Groups
Description
Article number 4742
Type
journal article