Articles written in Pramana – Journal of Physics
Volume 49 Issue 5 November 1997 pp 455-460
Density-based perturbation theory within the Hohenberg-Kohn (HK) formalism of density functional theory (DFT), developed recently by us, is employed to calculate hyperpolarizabilities of helium-like ions from their ground-state densities obtained from their respective Hylleraas wavefunctions. The only approximation made is that of the local density (LDA) for exchange and correlation. Use of densities — instead of wavefunctions — in density-based perturbation theory together with simple approximate energy functionals makes our calculations much simpler than those based on wavefunctions. They lead, however, to accurate results.
Volume 66 Issue 2 February 2006 pp 423-433
In this paper we employ the hydrodynamic formulation of time-dependent density functional theory to obtain the van der Waals coefficients
Volume 68 Issue 6 June 2007 pp 913-924 Research Articles
We have theoretically studied the collective modes of a quasi-two-dimensional (Q2D) Bose condensate in the large gas parameter regime by using a formalism which treats the interaction energy beyond the mean-field approximation. The results show that incorporation of this higher order term leads to significant modifications in the mode frequencies.
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