Dipanjan RayPostdoc
T-1/CNLS Computational Physics 
Office: TA-3, Bldg 1690, Room 136
Mail Stop: B258
Phone: (505) 667-7584
Fax: (505) 665-7652 rayd@lanl.gov
home page Research highlightMy scientific interests span a broad range of topics in fields such as soft and hard condensed matter, materials science, and computing. I am currently a Postdoctoral Research Associate with T-1 and CNLS under the mentorship of Arthur Voter and Danny Perez. My primary research topic is to advance our understanding of, and the power of, the local hyperdynamics method. Hyperdynamics was originally developed by Dr. Voter in 1997, as a method to efficiently obtain the rates of rare event processes in classical molecular dynamics simulations, by accelerating their occurrence using bias potentials. As originally conceived, this method loses its effectiveness with increased system size, and required tuning for each system to which it was to be applied. A refined method known as local hyperdynamics (LHD) has been developed to overcome the scaling problem; I am currently working to better understand the theoretical underpinnings of the method and to refine its workings to the point where it can be used in a "black box" fashion. I will provide implementations of LHD in the laboratory's internal parallel molecular dynamics code SPaSM, as well as in popular simulation frameworks such as LAMMPS, in order to make the benefits of LHD available to the scientific community at large.
|  | Educational Background/Employment:- B.Sc, Physics, UC Berkeley
- M.Sc, Physics, University of Notre Dame
- Ph.D, Physics, University of Notre Dame
- Professional Training:
- 2012-2014: Visiting Graduate Student Researcher, LANL
- 2014-present: Postdoctoral Research Fellow, LANL
Research Interests: - classical molecular dynamics and Monte Carlo methods
- rare event dynamics
- statistical mechanics
- high performance computing
- soft condensed matter
- active matter
- granular materials
- hard condensed matter
- superconductivity
- skyrmions
Selected Recent Publications: - C. Reichhardt, D. Ray, and C. J. Olson Reichhardt, Quantized Transport for a Skyrmion Moving on a Two-dimensional Periodic Substrate, Phys. Rev. B, accepted. (2015)
- C. Reichhardt, D. Ray, and C. J. Olson Reichhardt, Collective Transport Properties of Driven Skyrmions with Random Disorder, Phys. Rev. Lett., submitted. (2015)
- D. Ray, C. Reichhardt, and C. J. Olson Reichhardt, Pinning, Ordering, and Dynamics of Vortices in Conformal Crystal Arrays, Phys. Rev. B, 90, 094502. (2014)
- D. Ray, C. Reichhardt, and C. J. Olson Reichhardt, Casimir Effect in Active Matter Systems, Phys. Rev. E, 90, 013019. (2014)
- D. Ray, C. Reichhardt, and C. J. Olson Reichhardt, Vortex States in Archimedean Tiling Pinning Arrays, Supercond. Sci. Technol., 27, 075006. (2014)
- D. Ray, C. J. Olson Reichhardt, B. Janko, and C. Reichhardt, Strongly Enhanced Vortex Pinning by Conformal Crystal Arrays, Phys. Rev. Lett., 110, 267001. (2013)
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