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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