# Vidvuds Ozolins Seminar: Sparse Physics and its Applications to Energy Materials

### Vidvuds Ozolins

Professor, Department of Materials Science and Engineering, &

Director, DOE EFRC Molecularly Engineered Energy Materials,University of California, Los Angeles

Director, DOE EFRC Molecularly Engineered Energy Materials,

## Sparse Physics and its Applications to Energy Materials

November 13, 2013 | 4:00pm | ESB 1001

Faculty host: Chris Van de Walle

*>>>View Video and Presentation*

**Abstract**

The conventional approach to building physics models is based on physical intuition gained in prior studies of similar systems. Unfortunately, intuition is often faulty. We show that a recently developed technique from information science, compressive sensing (CS), provides a simple, efficient, and systematically improvable way of constructing models in a numerically robust and conceptually simple way. CS is a new paradigm for model building in physics - its models are sparse and just as robust or better than those built by current state-of-the-art approaches. They can be constructed at a fraction of the computational cost and user effort. We will illustrate the general idea and highlight applications to alloys, protein folding energetics, thermoelectrics and anhamronic lattice dynamics.

We will also introduce a general formalism for obtaining localized ("compressed") solutions to a class of problems in mathematical physics, which can be recast as variational optimization problems. This class includes the important cases of the Schrödinger’s equation in quantum mechanics and electromagnetic equations for light propagation in photonic crystals. These ideas can also be applied to develop a spatially localized basis that spans the eigenspace of a differential operator, for instance, the Laplace operator, generalizing the concept of plane waves to an orthogonal real-space basis with multi-resolution capabilities.

**Biography**

Vidvuds Ozolins is a Professor of Materials Science and Engineering at UCLA, and received a Ph.D. in Theoretical Physics from the Royal Institute of Technology in Stockholm, Sweden, in 1998. Before joining the UCLA Department of Materials Science and Engineering in 2002, he was a postdoctoral fellow at the National Renewable Energy Laboratory (NREL) and a Principle Member of Technical Staff at Sandia National Laboratories in Livermore, California. Prof. His research interests lie in the area of computational materials design and energy materials. He uses quantum mechanics based computation to study materials for energy storage, thermoelectrics, structural materials, advanced nuclear fuels, electronic and optical materials. He has published more than 100 refereed scientific papers and holds several patents in energy materials. He is currently a Director of Molecularly Engineered Energy Materials (MEEM), an EFRC of the DOE Office of Science, Basic Energy Sciences.

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