Showing papers by "Subir Sachdev published in 1984"
TL;DR: In this article, a recently developed Landau description of short-range icosahedral order in supercooled liquids and metallic glasses is used to calculate density correlation functions in these systems.
Abstract: A recently developed Landau description of short-range icosahedral order in supercooled liquids and metallic glasses is used to calculate density correlation functions in these systems. The theory predicts frustration-broadened peaks in the structure factor, at positions determined by the symmetries of an ideal, curved-space icosahedral crystal. The results provide a good fit to experiments on vapor-deposited metal films.
201 citations
TL;DR: In this paper, the interaction of a damped cavity with a two-level atom was examined and the effect of damping and fluctuations in the walls of the cavity on the atom-cavity interaction, at zero temperature and in the limit of small damping.
Abstract: The interaction of a damped cavity with a two-level atom is examined. The treatment is fully quantum mechanical. Expressions are obtained for the effect of damping and fluctuations in the walls of the cavity on the atom-cavity interaction, at zero temperature and in the limit of small damping. The physical situation can be realized with Rydberg atoms and a cavity.
80 citations
TL;DR: The statistical mechanics of particles embedded in a surface with quenched fluctuations in its topography is considered in this article, where it is shown that stable crystalline phases are possible at finite temperatures, with elastic constants renormalised from their flat-space values.
Abstract: The statistical mechanics of particles embedded in a surface with quenched fluctuations in its topography is considered. If the fluctuations are not too violent, stable crystalline phases are possible at finite temperatures, with elastic constants renormalised from their flat-space values. Point dislocations and disclinations couple only to the intrinsic gaussian curvature of the surface. Other effects of the surface can be gauged away, just as in Mattis models of spin glasses. At sufficiently low temperatures, crystalline arrays must melt re-entrantly via a dislocation instability. The resulting hexatic phase is also unstable at low temperatures. The random-topography problem is similar in many respects to that of particles in flat space disrupted by a quenched random array of impurities.
35 citations