Observation of shear-wave Mach cones in a 2D dusty-plasma crystal

被引:95
作者
Nosenko, V [1 ]
Goree, J
Ma, ZW
Piel, A
机构
[1] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
[2] Univ Kiel, Inst Expt & Angew Phys, Kiel, Germany
关键词
D O I
10.1103/PhysRevLett.88.135001
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Mach cones composed of shear waves were observed experimentally in a two-dimensional screened-Coulomb crystal. Highly charged microspheres suspended in a plasma and interacting with a repulsive Yukawa potential arranged themselves in a triangular lattice with hexagonal symmetry. Mach cones were excited by applying a force from the radiation pressure of a moving laser beam. They had a single-cone structure, which is explained by the almost dispersionless character of shear waves. The cone's opening angle obeyed the Mach-cone angle relation. Results are compared to a molecular-dynamics simulation.
引用
收藏
页码:4 / 135001
页数:4
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