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    Please visit new site at http://sudiarta.org
 

I Wayan Sudiarta
Post-Doctoral Fellow
Department of Physics and Atmospheric Science
Dalhousie University, Halifax, NS, Canada B3H 3J5
sudiarta@dal.ca

http://myweb.dal.ca/sudiarta
http://sudiarta.org
http://physics-simulation.blogspot.com

Current Research Project

I am currently developing a new computational procedure to do quantum simulation of few interacting electrons system at finite temperature. To do this I solve the time–dependent Schrödinger equation using the finite difference time domain method (FDTD) and compute thermal density matrix. From this density matrix I then determine thermodynamical properties, such as partition function, free energy and entropy as a function of temperature. Recent preliminary test results show that the numerical procedure and my computer program successfully produce thermodynamical properties of few electrons systems in one, two and three dimensions.

 Other Projects

+ Water-Graphite Interaction

I use ab initio quantum chemistry packages, such as Gaussian98 and GAMESS, to compute interaction energy of a water molecule with a surface.  The interaction energy is then used in molecular simulation to study adsorption of water molecules on the surface. I use DL_POLY program for molecular dynamics simulation. For molecular visualization,  I use gOpenMol, Molden, and VMD.

+ Building a linux cluster

I have successfully built a cluster of computers using computers in my office.
The cluster consists of 5 computers: 1 dual intel xeon 2.8 GHz processor computer,
2 intel pentium 3.2 GHz processor computer,1 intel xeon 2.0 GHz processor computer, and 1 intel pentium IV 1.8 GHz processor computer. All computers connected to a D-link gigabit ethernet switch and each computer has a gigabit ethernet card.
>>more detail

+ Physics Live CD

I have created a livecd mainly for physical simulations. The livecd is based on Slax livecd . It contains many physical simulations created by using c, gtk and glade. The physical simulations are taken from my research. It is hoped that this livecd will be useful for learning and teaching physics and research in physics.

>>more detail

+ Finite Difference Time Domain (FDTD) program

I have created an FDTD program for 3D electromagnetic wave propagation.  I used the FDTD program mainly for investigating the effective medium approximation for scattering of heterogeneous particle.
>>more detail

+ Effective medium approximation (EMA)

Using the FDTD program for 3D electromagnetic wave propagation, scattering of a EM plane wave by a spherical particle is simulated. One can then obtain scattering properties as well as the electric fields inside and outside the particle. From distribution of electric fields one can defined an effective medium.
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+ Mie Scattering in An Absorbing Medium

+ Linux from scratch (LFS)

+ Quantum Monte Carlo (QMC) Program


Other Research Interests

+ Numerical Simulation of Physical Systems
+ Wave Propagation in Random Media
+ Optical Microscopy
+ Alternative Energy Source

Publications

I W. Sudiarta and D. J. W. Geldart, "Solving the Schrödinger equation using the finite difference time domain method for complex Hamiltonian" Phys. Lett.. A. Submitted, 2007.

I W. Sudiarta and D. J. W. Geldart, "The Finite Difference Time Domain Method for Solving The Schrödinger Equation for Many Particles in One Dimension" Am J. Phys. To be Submitted, 2007.

I W. Sudiarta and D. J. W. Geldart, " Numerical Method for Computing Single-Particle Density Matrix" J. Phys. A: Math. Theor. Submitted, 2007.

I W. Sudiarta and D. J. W. Geldart, "Solving the Schrödinger equation using the finite difference time domain method" J. Phys. A: Math. Theor. 40 1885-1896, 2007  

I Wayan Sudiarta and D J Wallace Geldart, "Solving the Schrödinger equation using the finite difference time domain method" J. Phys. A: Math. Theor. 40 1885-1896, 2007   doi:10.1088/1751-8113/40/8/013

I.W. Sudiarta and D.J.W. Geldart, "Interaction Energy of a Water Molecule with a Single-Layer Graphitic Surface Modeled by Hydrogen- and Fluorine-Terminated Clusters", J. Phys. Chem. A, 110 (35), 10501 -10506, 2006

I.W. Sudiarta,"An absorbing boundary condition for FDTD truncation using multiple absorbing surfaces", IEEE Trans. Antennas Propagat., 51(12), 3268-3275, (2003)

I. W. Sudiarta, " Effective medium approximation for light scattering of heterogeneous particles", PhD Thesis, Dalhousie University, 2003.

I.W. Sudiarta and P. Chylek, "Mie-scattering formalism for spherical particles embedded in an absorbing medium", J. Opt. Soc. Am. A 18 (6): 1275-1278 (2001).

I.W. Sudiarta and P. Chylek, "Mie scattering efficiency of a large spherical particle embedded in an absorbing medium", J. Quant. Spectrosc. Radiative Transfer, 70 (4-6): 709-714 (2001).

J.W. O'Byrne, P. W. Fekete, M. R. Arnison, H. Zhao, M. Serrano, D. Philp, I. W. Sudiarta and C. J. Cogswell, "Adaptive Optics in Confocal Microscopy", Submitted  to World Scientific: 1999.

I. W. Sudiarta, "Confocal microscopy with a CCD camera", Honour thesis, the University of Sydney, 1998.

Programs

+ Finite Difference Time Domain Method Computer Program (C language: fdtdv1.zip)
+ Mie Scattering in Absorbing Medium (Mathematica notebook: absmie.nb)
+ Effective Medium Approximations (Mathematica notebook: emas.nb)