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Using molecular dynamics simulations we analyze the dynamics of two atomicliquids that display a liquid-liquid phase transition (LLPT): Si described bythe Stillinger-Weber potential and Ga as modeled by the modified embedded-atommodel (MEAM). In particular, our objective is to investigate the extent towhich the presence of a dip in the self-intermediate scattering function is amanifestation of an excess of vibrational states at low frequencies and may beassociated with a fragile-to-strong transition (FTST) across the LLPT, assuggested recently. Our results do not lend support to these suggestions.Specifically, in the case of Ga we observe the appearance of an excess ofvibrational states at low frequencies, even in the absence of the appearance ofa dip in the self-intermediate scattering function across the LLPT.Furthermore, studying the behavior of the shear viscosities traversing theLLPTs we find that, despite the development of a dip in the self-intermediatescattering function for the case of Si and its absence in Ga, both substancesare fragile in character above and below their respective LLPT temperatures.

Revisiting Dynamics Near a Liquid-Liquid Phase Transition in Si and Ga: The Fragile-to-Strong Transition