Titre :

The Ground State of Epitaxial Germanene on Ag(111)

Auteur(s) :

Zhang, Kai [Auteur]
Institut des Nanosciences de Paris [INSP]
Hanf, Marie-Christine [Auteur]
Institut de Science des Matériaux de Mulhouse [IS2M]
Bernard, Romain [Auteur]
Institut des Nanosciences de Paris [INSP]
Borensztein, Yves [Auteur]
Physico-chimie et dynamique des surfaces [INSP-E6]
Cruguel, Hervé [Auteur]
Physico-chimie et dynamique des surfaces [INSP-E6]
Resta, Andrea [Auteur]
Synchrotron SOLEIL [SSOLEIL]
Garreau, Yves [Auteur]
Laboratoire Matériaux et Phénomènes Quantiques [MPQ (UMR_7162)]
Synchrotron SOLEIL [SSOLEIL]
Vlad, Alina [Auteur]
Synchrotron SOLEIL [SSOLEIL]
Coati, Alessandro [Auteur]
Synchrotron SOLEIL [SSOLEIL]
Sciacca, Davide [Auteur]
Physique - IEMN [PHYSIQUE - IEMN]
Grandidier, Bruno [Auteur]
Physique - IEMN [PHYSIQUE - IEMN]
Derivaz, Mickael [Auteur]
Institut de Science des Matériaux de Mulhouse [IS2M]
Pirri, Carmelo [Auteur]
Institut de Science des Matériaux de Mulhouse [IS2M]
Sonnet, Philippe [Auteur]
Institut de Science des Matériaux de Mulhouse [IS2M]
Stephan, Régis [Auteur]
Institut de Science des Matériaux de Mulhouse [IS2M]
Prévot, Geoffroy [Auteur correspondant]
Physico-chimie et dynamique des surfaces [INSP-E6]

Titre de la revue :

ACS Nano

Pagination :

15687-15695

Éditeur :

American Chemical Society

Date de publication :

2023-08-22

ISSN :

1936-0851

Mot(s)-clé(s) en anglais :

germanene
silver
scanning tunneling microscopy
surface X-ray diffraction
density functional theory

Discipline(s) HAL :

Physique [physics]
Sciences de l'ingénieur [physics]

Résumé en anglais : [en]

Two-dimensional (2D) honeycomb lattices beyond graphene, such as germanene, appear very promising due to their outstanding electronic properties, such as the quantum spin Hall effects. While there have been many claims of ...
Lire la suite >Two-dimensional (2D) honeycomb lattices beyond graphene, such as germanene, appear very promising due to their outstanding electronic properties, such as the quantum spin Hall effects. While there have been many claims of germanene monolayers up to now, no experimental evidence of a honeycomb structure has been provided up to now for these grown monolayers. Using scanning tunneling microscopy (STM), surface X-ray diffraction (SXRD), and density functional theory, we have elucidated the Ge-induced(109−−−√×109−−−√)R±24.5∘reconstruction on Ag(111). We demonstrate that a powerful algorithm combining SXRD with STM allows us to solve a giant surface reconstruction with more than a hundred atoms per unit cell. Its extensive unit cell indeed consists of 98 2-fold or 3-fold coordinated Ge atoms, forming a periodic arrangement of pentagons, hexagons, and heptagons, with the inclusion of six dispersed Ag atoms. By analogy, we show that the(77–√×77–√)R±19.1∘reconstruction obtained by segregation of Ge through an epitaxial Ag/Ge(111) film possesses a similar structure, i.e., Ge pentagons/hexagons/heptagons with a few Ag atoms. Such an organization is more stable than that of pure Ge monolayers and can be assigned to the ground state of epitaxial germanene.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Projet ANR :

Croissance de germanene sur substrats à bande interdite
Equipement d'excellence de calcul intensif de Mesocentres coordonnés - Tremplin vers le calcul petaflopique et l'exascale

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL