Symposium TC04—Advanced Atomistic Algorithms in Materials Science

The symposium will focus on recent advances in algorithm development of novel atomistic simulation methodologies, both at the level of electronic structure calculations and of empirical-potential-based simulations, and on their applications. The symposium will be centered on methods that aim at addressing size and time-scale limitations of conventional techniques, two problems that often severely limit the scope of atomistic simulations in materials science.

As a first-principle method, density functional theory (DFT) has become an invaluable tool for materials modeling. However, with conventional implementation of Kohn-Sham DFT, one is usually limited to systems containing at most several hundred atoms. On the other hand, to model materials, it would often be desirable to study systems containing tens of thousands of atoms, or even more. In recent years, tremendous progress towards relaxing the time and length-scale limitations has been made in the DFT community. This symposium will address these new exciting advances in DFT by bringing experts from diverse fields such as orbital-free DFT, time-reversible ab-initio molecular dynamics, quasi-continuum DFT, and hybrid quantum/classical modeling.

At the other end of the spectrum, Molecular Dynamics (MD) algorithms based on empirical or semi-empirical potentials allow for greatly extended simulation sizes and times. Indeed, MD can be highly efficiently parallelized through domain decomposition, so that remarkably large systems can be efficiently simulated. However, these traditional algorithms are not suitable to study long time phenomena, such as defect diffusion, as they become communication bound. In systems where the dynamics are activated, i.e., where the dynamics consist of long periods of uneventful vibrational motion, punctuated by rare topological transitions, advanced simulation techniques, such as accelerated molecular dynamics and kinetic Monte Carlo methods, can be leveraged to extend the simulation times up to experimentally relevant scales. These methods often provide invaluable insight into the microstructural evolution of materials. The symposium will focus on recent advances in the development of these accelerated techniques, such as adaptive KMC methods, and on the new physics that can be learned as the timescale horizon is pushed further.

Atomistic to continuum approaches can also be used to efficiently sample phase space. Recent developments and their interaction with existing models are also of interest. Quasi-continuum approaches and their recent coupling with accelerated MD models, and the phase field crystal method are promising methodologies under development with the potential of extending the time and size scales of the atomistic systems under consideration.

Topics will include:

  • Addressing size and time limitations in DFT-based methods:- Orbital-free DFT- Time-reversible Ab-Initio Molecular Dynamics- Quasi-continuum DFT and hybrid quantum/classical modeling- Adaptive kinetic Monte Carlo
  • Long-time atomistic simulation methods:- Accelerated Molecular Dynamics- Adaptive kinetic Monte Carlo- Acceleration techniques for Kinetic Monte Carlo
  • Atomistic-Continuum Approaches:- Linking scales (Quai-Continuum and related developments)- Accelerated methods coupled to quasi-continuum approaches- Phase Field Crystal methods
  • A tutorial complementing this symposium is tentatively planned.

Invited Speakers:

  • Jacques Amar (University of Toledo, USA)
  • Vasily Bulatov (Lawrence Livermore National Laboratory, USA)
  • Emily Carter (Princeton University, USA)
  • Abhijit Chatterjee (Indian Institute of Technology Kanpur, India)
  • Kristen Fichthorn (Pennsylvania State University, USA)
  • Vikram Gavini (University of Michigan, USA)
  • Jurgen Hafner (University of Wien, Austria)
  • Ju Li (Massachusetts Institute of Technology, USA)
  • Gang Lu (California State University, USA)
  • Joachim Luitz (Viena University of Technology, Austria)
  • Normand Mousseau (University of Montreal, Canada)
  • Marco Nardelli (University of North Texas, USA)
  • Anders Niklasson (Los Alamos National Laboratory, USA)
  • Michael Payne (Cambridge University, United Kingdom)
  • Nikolas Provatas (McMaster University, Canada)
  • Talat Rahman (University of Central Florida, USA)
  • Jutta Rogal (Ruhr Universitat Bochum, Germany)
  • Christopher A. Schuh (Massachusetts Institute of Technology, USA)
  • Tim Schulze (University of Tennessee, USA)
  • Gideon Simpson (Drexel University, USA)
  • Ellad Tadmor (University of Minnesota, USA)
  • Alessandro Vita (King's College of London, United Kingdom)
  • Dionisios Vlachos (University of Delaware, USA)
  • Arthur Voter (Los Alamos National Laboratory, USA)
  • Lin-Wang Wang (Lawrence Berkeley National Laboratory, USA)

Symposium Organizers

Enrique Martinez
Los Alamos National Laboratory
USA
505-606-2149, enriquem@lanl.gov

Graeme Henkelman
University of Texas
USA

Hannes Jonsson
University of Iceland
Iceland
354-525-4000, hj@hi.is

Steven Kenny
Loughborough University
United Kingdom
44-1509-222860, s.d.kenny@lboro.ac.uk