Fig. 4.
Acoustic energy density controls crystal–liquid transition. (A) Time-averaged images of crystal-like (i) and liquid-like (ii) states over 167 ms at pac = 822 Pa and pac = 957 Pa. (B and C) Average kinetic energy per particle in the xy direction Ekin, and the bond order parameter Φ6 as a function of acoustic pressure, pac, averaged over 1 s. (D) Bond correlation function h6(t)=⟨Φ6(t − Δt)⋅Φ6(t)⟩ for crystal (maroon), liquid (blue), and intermittent dynamics (orange). Δt = 10 ms. We define P(crys) as the probability of h6 > 0.9 (the shaded region). (E) Probability of crystal-like state, P(crys), as a function of pac.