標題: Phase diagram of crystals of dusty plasma
作者: Lee, HC
Chen, DY
Rosenstein, B
電子物理學系
Department of Electrophysics
公開日期: 1-十月-1997
摘要: Dust particles effectively charged by plasma recently have been optically observed to exhibit crystalline phases not expected of Wigner or Yukawa crystals. Under varying conditions the crystal sometimes appears as deformed and oriented three-dimensional close-packed lattices of bcc, fcc, or hcp type, but mostly as a triangular array of vertical chains of particles. The unusual phases are shown to be caused by dipole-dipole interactions. The dipole moments are induced on the dust particles by gravity and by drag forces generated by ion stream. We describe in detail stable lattice structures and present the highly complex phase diagram of the dusty plasma. It turns out that in large parts of the phase diagram the stable phases indeed correspond to chains, but particles in neighboring chains belong to different sublattices. The stability of the lattices against excitations due to compression (i.e., aspect ratio variations) and vibration (i.e., phonons or charge density waves) is established.
URI: http://hdl.handle.net/11536/267
ISSN: 1063-651X
期刊: PHYSICAL REVIEW E
Volume: 56
Issue: 4
起始頁: 4596
結束頁: 4607
顯示於類別:期刊論文