G Mukhopadhyay
Articles written in Pramana – Journal of Physics
Volume 1 Issue 3 September 1973 pp 135-146 Solids
A simple derivation of the three magnon bound state equation
Chanchal K Majumdar G Mukhopadhyay A K Rajagopal
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
Dynamic response approach to dynamic image potential
P R Rao Chayanika Shah G Mukhopadhyay
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
Dynamic response and frequency dependent local field correction for an electron gas system
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
Response function approach to van der waals’ interaction between atom and metal surface
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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