Department of Physics and Center for Complex Systems, National Central University, Jhongli, Taiwan 32001, Republic of China.
Phys Rev Lett. 2009 Dec 11;103(24):245005. doi: 10.1103/PhysRevLett.103.245005.
The wave-particle microdynamics in the breaking of the self-excited dust acoustic wave growing in a dusty plasma liquid is investigated through directly tracking dust micromotion. It is found that the nonlinear wave growth and steepening stop as the mean oscillating amplitude of dust displacement reaches about 1/k (k is the wave number), where the vertical neighboring dust trajectories start to crossover and the resonant wave heating with uncertain crest trapping onsets. The dephased dust oscillations cause the abrupt dropping and broadening of the wave crest after breaking, accompanied by the transition from the liquid phase with coherent dust oscillation to the gas phase with chaotic dust oscillation. Corkscrew-shaped phase-space distributions measured at the fixed phases of the wave oscillation cycle clearly indicate how dusts move in and constitute the evolving waveform through dust-wave interaction.
通过直接跟踪尘埃微运动，研究了自激尘埃声波在尘埃等离子体液体中的破裂过程中的波粒微观动力学。研究发现，随着尘埃位移的平均振荡幅度达到约 1/k（k 是波数），非线性波的增长和陡峭停止，其中垂直相邻尘埃轨迹开始交叉，并且具有不确定波峰捕获起始的共振波加热。失相的尘埃振荡导致波峰在破裂后突然下降和变宽，同时伴随着从具有相干尘埃振荡的液相到具有混沌尘埃振荡的气相的转变。在波振荡周期的固定相位处测量的螺旋形相空间分布清楚地表明了尘埃如何通过尘埃-波相互作用进入并构成演变的波形。
