Research in Materials Simulations

N. A. W. Holzwarth

Department of Physics
Wave Forest University
Winston-Salem, NC 27109-7507
336-758-5510
email: natalie@wfu.edu

Our research group is devoted to the development and use of computational tools to model the fundamental and technological properties of materials.

Development of computational tools for materials simulations

Realistic simulation and modeling tools are essential for understanding the basic properties of materials and for designing materials for technology. Our research addresses the need for the development of algorithms and codes for modeling complex materials, focusing on the study of the detailed relationship between the properties of bulk materials with surfaces and interfaces. The modeling tools developed in the work will be useful for studying a wide variety of phenomena including the development of substrates for use in nano-scale devices, the analysis of scanning probe microscopies, the analysis of photoexcitation processes, and the development of catalysts and solid state battery materials.

The innovative simulation methods and codes developed in this work will be shared with the international computational materials physics community through our website https://pwpaw.wfu.edu and will serve several ongoing collaborations. Another important part of this effort is directed toward training student in computational techniques; including the development of algorithms and in the design of computer codes. Several of the students participating in this project also participate in a joint degree program between the Physics and Computer Science Departments at Wake Forest University, which has resulted in very productive collaborations.

Computational study of transition metal phosphate materials

One example of our materials-focussed projects is a systematic computational study of several of the crystalline transition metal phosphate materials. These materials exhibit a wide range of interesting physical and chemical properties which are not completely understood. For example, several of the materials are naturally occurring minerals of geological interest. Many of the materials have several polymorphic geometric and magnetic structures. Some of the materials have recently generated a lot of interest due to their electrochemical properties and their potential use in secondary batteries. Because of their technological promise in the battery industry and also in catalysis applications, a wealth of experimental results have been recently generated.

These computer simulations will help develop our qualitative and quantitative understanding of the structural and magnetic transformations of the materials and will also contribute to the analysis of properties of technological interest. Because of the special properties of transition metals in narrow band gap materials, some aspects of the proposed calculations will provide challenges beyond the current "state of the art" of computational formalism and coding. In particular, the electron-electron interactions associated with the transition metal sites are very important for determining the properties of the materials but are difficult to evaluate accurately. We also have a tangential project which examines a new approach to analyzing many-electron systems based on the a knowledge of electron pair states for the system.


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