Correlating multiscale acoustic waves and microscopic structural rearrangement in weakly stressed cold dusty plasma liquids

Hao-Wei Hu^1*, Wen Wang^1,2, Lin I¹

¹Department of Physics, National Central University, Jhongli, Taoyuan, Taiwan
²Molecular Science and Technology, Taiwan International Graduate Program, Academia Sinica and National Central University, Taipei, Taiwan

* Presenter:Hao-Wei Hu, email:yosino0311@gmail.com

We experimentally investigate the correlation between microscopic acoustic waves and structural rearrangements in weakly stressed cold dusty plasma liquids. Through multidimensional complementary ensemble empirical mode decomposition, the dust particle motions are decomposed into traveling wave modes with different scales. It is found that the acoustic wave modes cannot only be thermally excited but also emitted from the structural rearrangement sites. Large amplitude low frequency wave modes can in turn induce the structural rearrangement in the remote region through the sudden phase synchronization of those modes, which can be regarded as an alarm for avalanche type structural rearrangement.

Keywords: Dusty plasma liquids, Acoustic waves, Empirical mode decomposition