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Local Basis Gw Calculations and the Dielectric Response of Si and C Clusters

Published online by Cambridge University Press:  15 February 2011

Ming Yu ,
Sergio E. Ulloa  and
Sang H. Yang
Ming Yu
Affiliation:
Department of Physics and Astronomy, and Condensed Matter and Surface Sciences Program, Ohio University, Athens, OH 45701-2979
Sergio E. Ulloa
Affiliation:
Department of Physics and Astronomy, and Condensed Matter and Surface Sciences Program, Ohio University, Athens, OH 45701-2979
Sang H. Yang
Affiliation:
Department of Engineering Physics, Air Force Institute of Technology, 2950 P St. WPAFB, OH 45433-7765
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Abstract

We describe our progress in developing an ab initio computational scheme for the calculation of the dielectric response function of solids, with special emphasis here on Si and C clusters. All calculations are carried out employing a basis of localized atomic-like orbitals and include the evaluation of quasiparticle corrections. The self-energy operator is evaluated in the GW approximation, with a full frequency dependence for the dielectric matrix. The approach is convenient and computationally optimal for the calculation of optical properties of complex systems lacking full periodicity, such as surfaces and clusters. We present here the dielectric response functions of clusters with structures found after full equilibration via molecular dynamical simulations, and discuss the sensitivity of the optical properties to quasiparticle corrections.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 579: Symposium B – The Optical Properties of Materials , 1999 , 97
Copyright
Copyright © Materials Research Society 2000

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References

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