Single-layer of Bi_1-xSb_x grown on Ag(111)
arxiv(2024)
摘要
In this work, we report the growth of a single mixed Bi_1-xSb_x layer,
with diverse stoichiometries, on a Ag(111) substrate. The atomic geometry has
been thoroughly investigated by low energy electron diffraction, scanning
tunneling microscopy, and X-ray photoelectron spectroscopy experiments, as well
as calculations based on density functional theory (DFT). We first determined
that both pure systems (Bi/Ag(111) and Sb/Ag(111)) show similar behaviors: they
form surface alloys with (√(3)×√(3))R30^∘ periodicity for
coverages lower than 1/3 ML, and undergo a dealloying transition for higher
coverages up to 2/3 ML. We then established a simple preparation procedure to
obtain a mixed Bi-Sb overlayer on Ag(111): it is essential to start with a
surface completely covered by either of the two pure surface alloys and then
deposit the other element on it. The energetics derived from DFT calculations
provide insight into the systems preference towards the formation of this
phase, and also predict a pathway to the formation of Bi-rich non-alloyed
phases. The obtained mixed Bi-Sb phase has a lateral atomic arrangement very
similar to the one in the non-alloyed phase observed for Sb on Ag(111), with Sb
and Bi atoms distributed disorderly, and presents a significant vertical
corrugation, promising considerable Rashba effects.
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