Articles written in Pramana – Journal of Physics
Volume 1 Issue 3 September 1973 pp 135-146 Solids
A simple derivation of the equation for determining the bound states of three magnons in the Heisenberg linear chain with longitudinal anisotropy is given. The present method utilizes nothing more than the Schrödinger equation and Faddeev’s three body equations, and avoids the introduction of the ideal spin wave Hilbert space.
Volume 23 Issue 2 August 1984 pp 119-128 Solid State Physics
A dielectric response approach to the dynamic image potential of a charged particle approaching a planar metal surface is formulated. A self-consistent scheme for calculating the instantaneous speed of the particle, and its image potential is also derived. It is shown that the scheme does not rely on the actual approximations made while describing the response of the metal with surface. Various approximations are discussed and the corresponding numerical results compared. The effect of self-consistency and inclusion of dispersion in metal is noticeable.
Volume 26 Issue 5 May 1986 pp 441-458 Solid State Physics
We present here an approximate scheme to obtain the complex frequency-dependent local field correction,
Volume 27 Issue 4 October 1986 pp 563-573 Solid State Physics
Van der Waals’ attractive interaction between a neutral atom and a metal surface (semi-infinite jellium) is studied via dielectric response approach in the non-retarded limit. It is shown that the interaction energy can be written in terms of the same form factor
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