Magnetoplasmons in Rotating Dusty Plasmas

A rotating dusty plasma apparatus was constructed to provide the possibility of experimental emulation of extremely high magnetic fields by means of the Coriolis force, observable in a corotating measurement frame. We present collective excitation spectra for different rotation rates with a magnetic induction equivalent of up to 3200 T. We identify the onset of magnetoplasmon-equivalent mode dispersion in the rotating macroscopic two-dimensional single-layer dusty plasma. The experimental results are supported by molecular dynamics simulations of 2D magnetized Yukawa systems.

Figure 1

Schematics of the “RotoDust” electrode configuration.

Figure 2

Schematics of the image rotating optical configuration.

Figure 3

Longitudinal (a) and transverse (b) current fluctuation spectra of the single layer dust cloud without rotation ($\Omega =0$). Color scale is linear; values are in arbitrary units and are dropped.

Figure 4

Longitudinal (a) and transverse (b) current fluctuation spectra of the single layer dust cloud with a moderate rotation of $\Omega =9.1\mathrm{rad}/\mathrm{s}$.

Figure 5

Experimental and computed longitudinal current fluctuation spectra of the single layer dust with rotation frequencies (a) ${\Omega }_a=23.3\mathrm{rad}/\mathrm{s}$, (b) ${\Omega }_b=22.8\mathrm{rad}/\mathrm{s}$, (c) ${\Omega }_c=25\mathrm{rad}/\mathrm{s}$, and magnetizations (d) ${\beta }_a=0.52$, (e) ${\beta }_b=0.45$, (f) ${\beta }_c=0.76$, as listed in Table . ${\omega }_c=\beta {\omega }_p$ is the cyclotron frequency.

Figure 6

Experimental (symbols) and computed (lines) longitudinal wave dispersion. Labeling follows that of Table  and Fig. 5.