First Direct Measurement of Optical Phonons in 2D Plasma Crystals

被引：44

作者：

Couedel, L. ^{[1
]}

Nosenko, V. ^{[1
]}

Zhdanov, S. K. ^{[1
]}

Ivlev, A. V. ^{[1
]}

Thomas, H. M. ^{[1
]}

Morfill, G. E. ^{[1
]}

机构：

[1] Max Planck Inst Extraterr Phys, D-85741 Garching, Germany

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 21期

关键词：

TRANSVERSE-WAVES; DUST; EQUILIBRIUM;

D O I：

10.1103/PhysRevLett.103.215001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Spectra of phonons with out-of-plane polarization were studied experimentally in a 2D plasma crystal. The dispersion relation was directly measured for the first time using a novel method of particle imaging. The out-of-plane mode was proven to have negative optical dispersion at small wave numbers, comparison with theory showed good agreement. The effect of the plasma wakes on the dispersion relation is briefly discussed.

引用

页数：4

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