Observation of the solid and liquid separation after the shock propagation in a two-dimensional Yukawa solid

Abstract

After the propagation of compressional shocks in a two-dimensional (2D) Yukawa solid, the structure and dynamics of the postshock region are investigated using molecular dynamical simulations. When the compressional speed is significantly higher than 0.354a0ωpd, the postshock region melts completely; however, when this compressional speed is much lower than 0.283a0ωpd, the postshock region is still in the solid state. It is found that, when the compressional speed 0.283a0ωpd≤vleft≤0.354a0ωpd, from the calculated Voronoi diagram, the postshock region clearly exhibits the coexistence of the solid close to the compressional boundary and the liquid in the other part. The calculated averaged kinetic temperature profile in the postshock region exhibits a roughly linear increase in front of the compressional boundary, and the spatial portion whose averaged kinetic temperature is lower than the melting point agrees with the solid region determined directly from the Voronoi diagram. This spatial variation trend of the averaged kinetic temperature in the postshock region is attributed to the dynamical heterogeneity of the 2D Yukawa systems, which is more severe when the mean kinetic temperature is around the melting point. Test runs with various conditions further confirm this interpretation.

Melting of Titanium by a Shock Wave Generated by an Intense Femtosecond Laser Pulse

“…In this work, we study the main effects caused by melting induced by the dissipation of the kinetic energy in the shock front. Melting SWs were studied in [16,[19][20][21], but strengthening processes were not analyzed. Meanwhile, as shown below, they are important in this problem.…”

Structural transition of skyrmion quasiparticles under compression

“…A possible route to study this problem is to compress a number of particlelike skyrmions using one boundary, which is inspired by recent reports on the compressional shocks in Yukawa solids [58][59][60] and the report on the skyrmion avalanches [9]. In a two-dimensional (2D) Yukawa solid, the interaction between neighboring particles is described by the Yukawa potential [58][59][60][61], which produces a strong attractive force between two adjacent particles when the interparticle distance is significantly small.…”

“…A possible route to study this problem is to compress a number of particlelike skyrmions using one boundary, which is inspired by recent reports on the compressional shocks in Yukawa solids [58][59][60] and the report on the skyrmion avalanches [9]. In a two-dimensional (2D) Yukawa solid, the interaction between neighboring particles is described by the Yukawa potential [58][59][60][61], which produces a strong attractive force between two adjacent particles when the interparticle distance is significantly small. This is similar to a system of a massive number of nanoscale skyrmions stabilized by DM interactions, however, two rigid skyrmions experience a strong repulsive force when they are close to each other, which is described by the first-order modified Bessel function of the second kind [3].…”

Self-sustained non-equilibrium co-existence of fluid and solid states in a strongly coupled complex plasma system

“…The ordered structure is found to be disturbed by the dust flow, and disordered structure is produced in the vortex region which leads to an ordered-disordered structure coexistence in the system. Moreover, in a very recent molecular simulations study by Qiu et al 31 , a two-dimensional Yukawa solid and liquid separation after the shock propagation is reported. After the propagation of compressional shocks, the structure and dynamics of the post-shock region are investigated.…”