The frequency dependence of the soft mode anharmonic self-energy in KTaO3and SrTiO3

1978 ◽  
Vol 21 (1) ◽  
pp. 377-378 ◽  
Author(s):  
K. F. Pai ◽  
T. J. Parker ◽  
R. P. Lowndes
Keyword(s):  
Frequency Dependence ◽  
Soft Mode ◽  
Self Energy

Frequency Dependence of the Soft Mode in KNbO3

1988 ◽  
Vol 147 (1) ◽  
pp. 441-447 ◽  
Author(s):  
M. D. Fontana ◽  
A. Ridah ◽  
G. E. Kugel
Keyword(s):  
Frequency Dependence ◽  
Soft Mode

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

1999 ◽  
Vol 579 ◽  
Author(s):  
Ming Yu ◽  
Sergio E. Ulloa ◽  
Sang H. Yang
Keyword(s):  
Optical Properties ◽  
Frequency Dependence ◽  
Dielectric Response ◽  
Energy Operator ◽  
The Self ◽  
Response Functions ◽  
Gw Approximation ◽  
Dielectric Response Function ◽  
Self Energy ◽  
Dynamical Simulations

ABSTRACTWe 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.

Anharmonic Self-Energy of a Soft Mode

1971 ◽  
Vol 27 (17) ◽  
pp. 1134-1136 ◽  
Author(s):  
R. P. Lowndes
Keyword(s):  
Soft Mode ◽  
Self Energy

Hyper-Raman spectra and frequency dependence of soft mode damping in SrTiO3

1983 ◽  
Vol 14 (4) ◽  
pp. 276-283 ◽  
Author(s):  
V. N. Denisov ◽  
B. N. Mavrin ◽  
V. B. Podobedov ◽  
J. F. Scott
Keyword(s):  
Frequency Dependence ◽  
Raman Spectra ◽  
Soft Mode

Vertex symmetry and the asymptotic frequency dependence of the self-energy

1997 ◽  
Vol 55 (4) ◽  
pp. 2089-2094 ◽  
Author(s):  
J. J. Deisz ◽  
D. W. Hess ◽  
J. W. Serene
Keyword(s):  
Frequency Dependence ◽  
The Self ◽  
Self Energy

On the Frequency-Dependence of the Chirality Pseudoscalar of a Chiral Medium

1995 ◽  
Vol 5 (7) ◽  
pp. 913-918 ◽  
Author(s):  
Frédéric Guérin ◽  
Akhlesh Lakhtakia
Keyword(s):  
Frequency Dependence ◽  
Chiral Medium
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