We fabricated flat, two-dimensional germanium sheets showing a honeycomb lattice that matches that of germanene by depositing submonolayers of Ge on graphite at room temperature and subsequent annealing to 350 °C. Scanning tunneling microscopy shows that the germanene islands have a small buckling with no atomic reconstruction and does not give any hints for alloy formation and hybridization with the substrate. Our density functional theory calculations of the structural properties agree well with our experimental findings and indicate that the germanene sheet interacts only weakly with the substrate underneath. Our band structure calculations confirm that the Dirac cone of free-standing germanene is preserved for layers supported on graphite. The germanene islands show a small but characteristic charge transfer with the graphite substrate which is predicted by our ab initio simulations in excellent agreement with scanning tunneling spectroscopy measurements.

Persichetti, L., Jardali, F., Vach, H., Sgarlata, A., Berbezier, I., Crescenzi, M.d., et al. (2016). Van der Waals Heteroepitaxy of Germanene Islands on Graphite. THE JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 7(16), 3246-3251 [10.1021/acs.jpclett.6b01284].

Van der Waals Heteroepitaxy of Germanene Islands on Graphite

Persichetti, Luca
Membro del Collaboration Group
;
Sgarlata, Anna
Membro del Collaboration Group
;
Crescenzi, Maurizio De
Membro del Collaboration Group
;
Balzarotti, Adalberto
Membro del Collaboration Group
2016-01-01

Abstract

We fabricated flat, two-dimensional germanium sheets showing a honeycomb lattice that matches that of germanene by depositing submonolayers of Ge on graphite at room temperature and subsequent annealing to 350 °C. Scanning tunneling microscopy shows that the germanene islands have a small buckling with no atomic reconstruction and does not give any hints for alloy formation and hybridization with the substrate. Our density functional theory calculations of the structural properties agree well with our experimental findings and indicate that the germanene sheet interacts only weakly with the substrate underneath. Our band structure calculations confirm that the Dirac cone of free-standing germanene is preserved for layers supported on graphite. The germanene islands show a small but characteristic charge transfer with the graphite substrate which is predicted by our ab initio simulations in excellent agreement with scanning tunneling spectroscopy measurements.
2016
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/03 - FISICA DELLA MATERIA
English
http://pubs.acs.org/journal/jpclcd
Persichetti, L., Jardali, F., Vach, H., Sgarlata, A., Berbezier, I., Crescenzi, M.d., et al. (2016). Van der Waals Heteroepitaxy of Germanene Islands on Graphite. THE JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 7(16), 3246-3251 [10.1021/acs.jpclett.6b01284].
Persichetti, L; Jardali, F; Vach, H; Sgarlata, A; Berbezier, I; Crescenzi, Md; Balzarotti, A
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/213107
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