T V Ramakrishnan
Articles written in Pramana – Journal of Physics
Volume 7 Issue 2 August 1976 pp 63-94 Solids
Electron-electron interaction and instabilities in one-dimensional metals
The possible instabilities of a 1-dimensional itinerant electron gas are discussed, assuming electron-electron interaction to play the dominant role. As is well known, in the RPA, a 1-dimensional metal is prone to spin density wave (SDW), charge density wave (CDW) and Cooper pair (CP) instabilities. The spin channel decomposition of the irreducible scattering amplitude I is made and the spin channel projections are evaluated in terms of the matrix elements of bare electron-electron interaction
The above RPA results serve only as rough indicators, since in general there are important two-electron configurations with two-electron momentum close to zero and with electron hole momentum close to 2
Volume 22 Issue 3-4 March 1984 pp 365-375 Nuclear Physics
Density wave theory of freezing and the solid
The theory of the liquid to solid transition, in three as well as in two dimensions, is reviewed. The transition can be viewed either as the melting of the solid due to phonon or defect proliferation instabilities or alternatively as freezing of the liquid into a density wave state with crystalline symmetry. A theory due to Yussouff and the author, based on the latter idea, is discussed and its predictions are compared with experiment. It is shown that the theory leads to a new approach to the properties of a deformed (
Volume 58 Issue 2 February 2002 pp 149-153
Some open problems in the physics of disordered systems
Some problems in the physics of disordered systems are pointed out; most of these arise from experiments.
Volume 94, 2020
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