Volume 85, Number 6, March 2009
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||07 April 2009|
First-principles calculations and bias-dependent STM measurements at the -Sn/Ge(111) surface
ISM CNR - Via del Fosso del Cavaliere 100, I-00133 Roma, Italy, EU
2 NAST Centre - Via della Ricerca Scientifica 1, I-00133 Roma, Italy, EU
3 Department of Physics and Astronomy, Vanderbilt University - Nashville, TN 37235-1807, USA
4 ETSF, INFM-CNR Dipartimento di Fisica, Università di Roma “Tor Vergata" Via della Ricerca Scientifica 1, I-00133 Roma, Italy, EU
5 CINaM-CNRS, Campus de Luminy - Case 913, F-13288 Marseille Cedex 09, France, EU
6 UFR Sciences de la Matière, Université de Provence - Marseille, France, EU
Corresponding author: firstname.lastname@example.org
Accepted: 25 February 2009
The nature of the α-Sn/Ge(111) surface is still a matter of debate. In particular, two possible configurations have been proposed for the 33 ground state of this surface: one with two Sn adatoms in a lower position with respect to the third one (1U2D) and the other with opposite configuration (2U1D). We report ab initio GW calculations for the α-Sn/Ge(111) system, simulating STM images as a function of bias voltage and comparing them with STM experimental results at 78 K. The concurrent application of theory and experiments and the very good match between their results provide unambiguous indications that the stable configuration for the α-Sn/Ge(111) surface is the 1U2D. The possible inequivalence of the two down Sn adatoms is also discussed.
PACS: 68.37.Ef – Scanning tunneling microscopy (including chemistry induced with STM) / 73.20.-r – Electron states at surfaces and interfaces / 68.35.-p – Solid surfaces and solid-solid interfaces: structure and energetics
© EPLA, 2009
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.