Instantaneous resonant modes in high-temperature gallium liquids

We have studied the low-frequency, quasilocalized vibrational excitations in Ga liquids in terms of instantaneous-normal-mode analysis. We present strong numerical evidence for the existence of the instantaneous resonant modes (IRM's) in high-temperature Ga liquids. It is the exotic repulsive-core interaction between Ga particles that gives rise to the IRM'S, which are associated with special local structures created by density fluctuation. In general, the IRM density of states is found to increase with temperature.