linkedintwitter
Annuaire  |  Flux RSS  |  Espace presse  |  Wiki IJL  |  Webmail  |  Videos  |    Photos   Single-Calendar-Single  Single-Calendar-Single 
January 2015
Sun Mon Tue Wed Thu Fri Sat
  01 02 03
04 05 06 07 08
09
10
11
12
13
14
15
16
17
18 19 20 21
22
23 24
25 26
27
28 29 30
31
Archives des actualités

Article

Category: Evénements scientifiques

Vendredi 16 janvier 2015 : Séminaire de Paola DE PADOVA (CNR-ISM) : Multilayer Silicene: electronic properties and its stability in air


Dans le cadre de la priorité scientifique "Matériaux Artificiels Nanostructurés", l'Institut Jean lamour invite Paola De Padova (CNR-ISM, Italie) pour un séminaire intitulé :


"Multilayer Silicene: electronic properties and its stability in air"

 

Date et lieu :

Vendredi 16 janvier 2015 à 14h
Institut Jean Lamour
Faculté des Sciences et Technologies, Vandoeuvre-lès-Nancy
Bat 2nd cycle - Salle de séminaire - 4ème étage


Résumé / Abstract :

Multilayer silicene 1 -3, the silicon analogue of multilayer graphene, is grown on silver (111) surface with a honeycomb v3×v3R(30°) reconstruction, as observed by scanning tunnelling microscopy, after the initial formation of the 3×3 reconstructed, silicene monolayer. We mapped the entire Brillouin zone (BZ) of v3×v3R(30°) reconstructed epitaxial multilayer silicene terraces, by angle-resolved photoemission spectroscopy, showing states with linear dispersion related to p and p* bands of massless quasiparticles of multilayer silicene.

Thick epitaxial multilayer silicene films are unaffected by oxygen exposure up to 1´1010 L (1L=1.33 10-6 mbar × 1 s) in UHV, whereas only weak surface oxidation after 24 hours in air was detected by Auger electron spectroscopy 4. Ex-situ X-ray diffraction as well as Raman spectroscopy performed, without any protective capping, showed the 002 silicene reflection and the G, D and 2D Raman structures, which can be considered the fingerprints of silicene multilayer.

These results are of fundamental importance for exploiting silicene in the existing silicon based device technology. Preliminary results of multilayer silicene on v3×v3R(30°) Ag/Si(111)7×7 will be showed.


1 P. De Padova et al., Appl. Phys. Lett. 102, 163106 (2013).
2 P. De Padova et al., , J. Phys. : Condens. Matter, Fast Track Commun. 25, 382202 (2013).
3 P. De Padova et al., Nano Lett. 12, 5500 (2012).
4 P. De Padova et al., submitted paper.