Title
|
|
|
|
Hydrogen-induced rehybridization in epitaxial silicene
|
|
Author
|
|
|
|
|
|
Abstract
|
|
|
|
We report on the hydrogenation of (3 x 3)/(4 x 4) silicene epitaxially grown on Ag(111) studied by in situ Raman spectroscopy and state-of-the-art ab initio calculations. Our results demonstrate that hydrogenation of (3 x 3)/(4 x 4) silicene leads to the formation of two different atomic structures which exhibit distinct spectral vibrational modes. Raman selection rules clearly show that the Si atoms undergo a rehybridization in both cases from a mixed sp(2)-sp(3) to a dominating sp(3) state increasing the distance between the two silicene sublattices. This results in a softening of the in-plane and a stiffening of the out-of-plane phonon modes. Nevertheless, hydrogenated epitaxial silicene retains a two-dimensional nature and hence can be considered as epitaxial silicane. The level of hydrogenation can be determined by the intensity ratio of the Raman modes with different symmetries. |
|
|
Language
|
|
|
|
English
|
|
Source (journal)
|
|
|
|
Physical review B / American Physical Society. - New York, N.Y, 2016, currens
|
|
Publication
|
|
|
|
New York, N.Y
:
American Physical Society
,
2017
|
|
ISSN
|
|
|
|
2469-9969
[online]
2469-9950
[print]
|
|
DOI
|
|
|
|
10.1103/PHYSREVB.96.235423
|
|
Volume/pages
|
|
|
|
96
:23
(2017)
, 6 p.
|
|
Article Reference
|
|
|
|
235423
|
|
ISI
|
|
|
|
000417921100004
|
|
Medium
|
|
|
|
E-only publicatie
|
|
Full text (Publisher's DOI)
|
|
|
|
|
|