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Primeur weekly 2011-05-23

EuroFlash

Swiss National Supercomputing Centre to upgrade its Cray supercomputer

Joint European DCI Summer School 2011 to issue Call for Participation

Bull's new StoreWay Virtuo NV series provides industry-leading performance and flexibility for data back-up virtualization

Dassault Systèmes delivers new, innovative realistic simulation technology in SIMULIA's Abaqus 6.11 release

IBM and SARA sign collaboration agreement on petascale computing

IBM and ETH Zurich open collaborative Nanotechnology Center

Dassault Systèmes accelerates computer-aided engineering by using NVIDIA GPUs

PRACE/LinkSCEEM hosted a successful programming school, training videos are now on-line

Eyescale announces the release of Equalizer 1.0 and Collage 0.3.

University of Colorado at Boulder uses VASCO's strong authentication to prevent malicious attacks

ADVA FSP 3000 enables unprecedented services for Italian research and education community

Lonestar Education and Research Network selects ADVA Optical Networking for network expansion

USFlash

BOINC Monitor has been released

BOINC 6.12.26 released to public

BoincTasks 1.00 released

New Convey GraphConstructor leverages hybrid-core architecture to speed de novo genome assembly

Idaho National Laboratory selects Appro Xtreme-X supercomputer

Appro supports NVIDIA Tesla M2090 for all its supercomputing systems and platforms

New NVIDIA Tesla GPU smashes world record in scientific computation

NCSA installing 153 teraflop supercomputer

BMC Software, Eucalyptus, HP, IBM, Intel, Red Hat and SUSE create Open Virtualization Alliance

LincolnCenter.org moves to a private Cloud at Logicworks

University of Toledo physicist accelerates simulations of thin film growth

Rensselaer Supercomputer Director named to national initiative on High Performance Computing

TELUS to build $65 million Intelligent Internet Data Centre in Rimouski, Quebec

GSU researcher discovers new method to provide better understanding of plant life

VMware to acquire Shavlik Technologies

University of Toledo physicist accelerates simulations of thin film growth

17 May 2011 Columbus - A Toledo, Ohio, physicist has implemented a new mathematical approach that accelerates some complex computer calculations used to simulate the formation of micro-thin materials. Jacques Amar, Ph.D., professor of physics at the University of Toledo (UT), studies the modelling and growth of materials at the atomic level. He uses Ohio Supercomputer Center (OSC) resources and Kinetic Monte Carlo (KMC) methods to simulate the molecular beam epitaxy (MBE) process, where metals are heated until they transition into a gaseous state and then reform as thin films by condensing on a wafer in single-crystal thick layers.

"One of the main advantages of MBE is the ability to control the deposition of thin films and atomic structures on the atomic scale in order to create nanostructures", explained Jacques Amar. Thin films are used in industry to create a variety of products, such as semiconductors, optical coatings, pharmaceuticals and solar cells.

"Ohio's status as a worldwide manufacturing leader has led OSC to focus on the field of advanced materials as one of our areas of primary support", noted Ashok Krishnamurthy, co-interim co-executive director of the centre. "As a result, numerous respected physicists, chemists and engineers, such as Dr. Amar, have accessed OSC computation and storage resources to advance their vital materials science research."

Recently, Dr. Amar leveraged the centre's powerful supercomputers to implement a "first-passage time approach" to speed up KMC simulations of the creation of materials just a few atoms thick.

"The KMC method has been successfully used to carry out simulations of a wide variety of dynamical processes over experimentally relevant time and length scales", Dr. Amar noted. "However, in some cases, much of the simulation time can be 'wasted' on rapid, repetitive, low-barrier events."

While a variety of approaches to dealing with the inefficiencies have been suggested, Dr. Amar settled on using a first-passage-time (FPT) approach to improve KMC processing speeds. FPT, sometimes also called first-hitting-time, is a statistical model that sets a certain threshold for a process and then estimates certain factors, such as the probability that the process reaches that threshold within a certain amount time or the mean time until which the threshold is reached.

"In this approach, one avoids simulating the numerous diffusive hops of atoms, and instead replaces them with the first-passage time to make a transition from one location to another", Dr. Amar stated.

In particular, Dr. Amar and colleagues from the UT department of Physics and Astronomy targeted two atomic-level events for testing the FPT approach: edge-diffusion and corner rounding. Edge-diffusion involves the "hopping" movement of surface atoms - called adatoms - along the edges of islands, which are formed as the material is growing. Corner rounding involves the hopping of adatoms around island corners, leading to smoother islands.

Dr. Amar compared the KMC-FPT and regular KMC simulation approaches using several different models of thin film growth: Cu/Cu(100), fcc(100) and solid-on-solid (SOS). Additionally, he employed two different methods for calculating the FPT for these events: the mean FPT (MFPT), as well as the full FPT distribution.

"Both methods provided 'very good agreement' between the FPT-KMC approach and regular KMC simulations", Dr. Amar concluded. "In addition, we find that our FPT approach can lead to a significant speed-up, compared to regular KMC simulations."

Dr. Amar's FPT-KMC approach accelerated simulations by a factor of approximately 63 to 100 times faster than the corresponding KMC simulations for the fcc(100) model. The SOS model was improved by a factor of 36 to 76 times faster. For the Cu/Cu(100) tests, speed-up factors of 31 to 42 and 22 to 28 times faster were achieved, respectively, for simulations using the full FPT distribution and MFPT calculations.

Dr. Amar's research was supported through multiple grants from the National Science Foundation, as well as by a grant of computer time from OSC. A paper co-authored by Dr. Amar and UT colleagues Giridhar Nandipati and Yunsic Shim, "First-passage time approach to kinetic Monte Carlo simulations of metal (100) growth", appeared in a recent issue of the journalPhysical Review B.

Source: Ohio Supercomputer Center

Back to Table of contents

Primeur weekly 2011-05-23

EuroFlash

Swiss National Supercomputing Centre to upgrade its Cray supercomputer

Joint European DCI Summer School 2011 to issue Call for Participation

Bull's new StoreWay Virtuo NV series provides industry-leading performance and flexibility for data back-up virtualization

Dassault Systèmes delivers new, innovative realistic simulation technology in SIMULIA's Abaqus 6.11 release

IBM and SARA sign collaboration agreement on petascale computing

IBM and ETH Zurich open collaborative Nanotechnology Center

Dassault Systèmes accelerates computer-aided engineering by using NVIDIA GPUs

PRACE/LinkSCEEM hosted a successful programming school, training videos are now on-line

Eyescale announces the release of Equalizer 1.0 and Collage 0.3.

University of Colorado at Boulder uses VASCO's strong authentication to prevent malicious attacks

ADVA FSP 3000 enables unprecedented services for Italian research and education community

Lonestar Education and Research Network selects ADVA Optical Networking for network expansion

USFlash

BOINC Monitor has been released

BOINC 6.12.26 released to public

BoincTasks 1.00 released

New Convey GraphConstructor leverages hybrid-core architecture to speed de novo genome assembly

Idaho National Laboratory selects Appro Xtreme-X supercomputer

Appro supports NVIDIA Tesla M2090 for all its supercomputing systems and platforms

New NVIDIA Tesla GPU smashes world record in scientific computation

NCSA installing 153 teraflop supercomputer

BMC Software, Eucalyptus, HP, IBM, Intel, Red Hat and SUSE create Open Virtualization Alliance

LincolnCenter.org moves to a private Cloud at Logicworks

University of Toledo physicist accelerates simulations of thin film growth

Rensselaer Supercomputer Director named to national initiative on High Performance Computing

TELUS to build $65 million Intelligent Internet Data Centre in Rimouski, Quebec

GSU researcher discovers new method to provide better understanding of plant life

VMware to acquire Shavlik Technologies