Speed determination of single Sr adatoms moving within Si(111)-7×7 half unit cells

Zhachuk, R.; Teys, S.; Olshanetsky, B.; Pereira, S.
August 2009
Applied Physics Letters;8/10/2009, Vol. 95 Issue 6, p061901
Academic Journal
In this paper we report on the motion of individual Sr adatoms within the limits of Si(111)-7×7 half unit cells (HUCs). The fast movement of the atom at the Si surface produces sharp signal fluctuations in scanning tunneling microscopy (STM) images resulting into noiselike patches. It is found that the length of the observed image streaks is a function of the scanning tip velocity. A Monte Carlo simulation implementing a model of independently moving Sr adatom and scanning tip, accounts for the observed STM image features quantitatively. Thus, by colleting STM images at various scanning speeds and matching simulated image features to the experimental observations, allows the average speed of Sr adatom within the limits of Si(111)-7×7 HUC to be estimated: 300 nm/s.


Related Articles

  • Determination of chemical specific atomic interaction with scanning tunneling microscope. Deshpande, Aparna; Felix Braun, Kai; Hla, Saw-Wai // Applied Physics Letters;11/28/2011, Vol. 99 Issue 22, p221902 

    We present an experimental technique to comparatively determine the shape of tip-atom interaction potential and interaction strength of individual atoms on a surface using a scanning tunnelling microscope. From the atom manipulation signals, the tip-atom force vector angle is measured as a...

  • Quantum Monte Carlo study of small pure and mixed spin-polarized tritium clusters. Besˇlić, I.; Vranjesˇ Markić, L.; Boronat, J. // Journal of Chemical Physics;2/14/2008, Vol. 128 Issue 6, p064302 

    We have investigated the stability limits of small spin-polarized clusters consisting of up to ten spin-polarized tritium T↓ atoms and the mixtures of T↓ with spin-polarized deuterium D↓ and hydrogen H↓ atoms. All of our calculations have been performed using the...

  • Detection of Cold Antihydrogen Annihilation. Zhang, Z.; Goldenbaum, F.; Grzonka, D.; Oelert, W.; Sefzick, T. // AIP Conference Proceedings;2005, Vol. 796 Issue 1, p417 

    The ATRAP experiment at the CERN antiproton decelerator AD aims for a test of the CPT invariance by a high precision comparison of the 1s-2s transition between the hydrogen and the antihydrogen atom. The experimental studies are performed at two separate installations, ATRAP-I, a system with...

  • Causes of the Stability of Three-Bilayer Islands and Steps on a Si (111) Surface. Zverev, A. V.; Neizvestny, I. G.; Reızvikh, I. A.; Romanyuk, K. N.; Teys, S. A.; Shwartz, N. L.; Yanovitskaya, Z. Sh. // Semiconductors;Aug2005, Vol. 39 Issue 8, p967 

    The initial stages of growth of Ge and Si layers on a singular Si (111) surface result in an unusual morphology of the growth surface if the layers are deposited at a low rate; i.e., triangular islands with a height of as much as three atomic layers are formed. A simulation based on the Monte...

  • Grand canonical Monte Carlo simulation of a model colloid–polymer mixture: Coexistence line, critical behavior, and interfacial tension. Vink, R. L. C.; Horbach, J. // Journal of Chemical Physics;8/15/2004, Vol. 121 Issue 7, p3253 

    Grand canonical Monte Carlo simulations are used to study phase separation in a simple colloid–polymer model, the so-called Asakura–Oosawa model. To overcome the problem of small acceptance rates of the grand-canonical moves, cluster moves are introduced. Successive umbrella...

  • Critical behavior of long straight rigid rods on two-dimensional lattices: Theory and Monte Carlo simulations. Matoz-Fernandez, D. A.; Linares, D. H.; Ramirez-Pastor, A. J. // Journal of Chemical Physics;6/7/2008, Vol. 128 Issue 21, p214902 

    The critical behavior of long straight rigid rods of length k (k-mers) on square and triangular lattices at intermediate density has been studied. A nematic phase, characterized by a big domain of parallel k-mers, was found. This ordered phase is separated from the isotropic state by a...

  • Phase equilibria and interfacial tension of fluids confined in narrow pores. Hamada, Yoshinobu; Koga, Kenichiro; Tanaka, Hideki // Journal of Chemical Physics;8/28/2007, Vol. 127 Issue 8, p084908 

    Correlation between phase behaviors of a Lennard-Jones fluid in and outside a pore is examined over wide thermodynamic conditions by grand canonical Monte Carlo simulations. A pressure tensor component of the confined fluid, a variable controllable in simulation but usually uncontrollable in...

  • The eighth virial coefficient of four- and five-dimensional hard hyperspheres. Bishop, Marvin; Masters, Andrew; Vlasov, A. Yu. // Journal of Chemical Physics;4/15/2005, Vol. 122 Issue 15, p154502 

    The eighth virial coefficient for hard hyperspheres is calculated by Monte Carlo techniques. It is found that B8/B27=0.000 274±0.000 014 and -0.000 115±0.000 012 in four and five dimensions, respectively. The results are in good agreement with the findings of Clisby and McCoy (e-print...

  • Simulations of vapor water clusters at vapor–liquid equilibrium. Johansson, Erik; Bolton, Kim; Ahlström, Peter // Journal of Chemical Physics;7/8/2005, Vol. 123 Issue 2, p024504 

    The Gibbs-ensemble Monte Carlo methods based on the extended single point charge [H. J. C. Berendsen, J. R. Grigera, and T. P. Straatsma, J. Phys. Chem. 91, 6269 (1987)] potential-energy surface have been used to study the clustering of vapor phase water under vapor–liquid equilibrium...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics