2 May 2016 (Monday)

Physics Seminar Dr. Ian Vega : "Einstein and the Music of the Spheres" - click for details

3-4 May 2016 (Tues/Wed)

Talks by Dr. Daniel Onofrei from the University of Houston - click for details

March 28 - May 9, 2016 (Every Monday)

Physics Faculty seminars (view schedule here)

New ISI international publication


Prof. Darwin B. Putungan has come out with a new ISI international journal publication which he co-authored with Dr. Marvin A. Albao, and Chia-Hsiu Hsu and Feng-Chuan Chuang from the Department of Physics, National Sun Yat-Sen University, Taiwan. This paper is the result of the collaborative research project funded by the UP System Research Grant and led by Dr. Albao. This publication entitles Prof. Putungan to an International Publication Award, IMSP's first for 2010.

Marvin A. Albao, Chia-Hsiu Hsu, Darwin B. Putungan, Feng-Chuan Chuang, "Room-temperature deposition of Group III metals on Si(100): a comparative study of nucleation behavior," Surface Science 604 (2010) 396-403.


In this paper, we compare and contrast the processes of nucleation and subsequent growth of single-atom wide metal chains formed when group III metals (Al, Ga, In) are deposited onto Si(100) at room-temperature (RT). Employing Density Functional Theory (DFT) calculations, diffusion pathways on Si(100) surface are identified and their associated activation barriers are calculated. Then the relative stabilities of various C-defect-pinned chains are examined by comparing the relevant adsorption energies. We also account for the observation that defect-nucleated chains grow on only one side of a C-defect by showing that the latter's presence breaks the symmetry between the two previously equivalent binding sites on either side and rendering one much more stable than the other. Next, a growth model tailored for each group III metal/Si(100) system and incorporating the above results was simulated using Kinetic Monte Carlo (KMC) techniques to show that the surface morphologies generated by this model accurately reflect the observed ratio of homogeneously to heterogeneously nucleated chains. Finally, we examine through KMC simulations the consequences of the contrasting roles of a defect on In/Si(100) and Al/Si(100) ? it captures adatoms in the former while it merely blocks direct adatom diffusion in the latter ? on key quantities such as the mean island density.


Last Updated on Friday, 10 February 2012 10:19


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