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Intense ultrafast laser excitation can produce transient states of condensedmatter that would otherwise be inaccessible. At high excitation level, theinteratomic forces can be altered resulting in an unusual lattice dynamics.Here we report the study of coherent lattice dynamics in Bi made for variousexcitation levels at helium temperature. We demonstrate that under certainconditions the fully symmetric phonons of large amplitude exhibit anomalousdecay and phase rigidity, both of which possibly signaling the attainment oftransient supersolid state.

Power law decay and phase rigidity for large-amplitude coherent phonons  in bismuth at helium temperature: Possible evidence for transient supersolid  state