Abstract
The origin of relaxing collective modes in liquid semimetallic Bi is studied within the generalized collective modes approach. It is found that the lowest kinetic relaxing mode strongly affects the shape of the density-density time correlation functions beyond the hydrodynamic region and determines specific de Gennes features slowing the density fluctuations near the main peak of the structure factor. It is shown that this kinetic relaxing mode appears due to structural relaxation in a liquid. Contributions of different collective modes to the shape of the density-density time correlation functions are studied in detail.
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