Volume 107, Number 3, August 2014
|Number of page(s)||6|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||30 July 2014|
Second plasmon and collective modes in binary Coulomb systems
1 Department of Physics, Boston College - Chestnut Hill, MA 02467, USA
2 Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences H-1121 Budapest, Konkoly- Thege Miklós str. 29-33, Hungary
3 Department of Mathematics and Statistics and Department of Physics, University of Vermont Burlington, VT 05405-1455, USA
Received: 13 March 2014
Accepted: 4 July 2014
In a system consisting of two different charged species we identify the excitation of a second, low-frequency plasmon. At strong coupling the doublet of high-frequency (first) and low-frequency (second) plasmons replaces the single-plasmon excitation that prevails at weak coupling. We observe the formation of the second plasmon from the acoustic Goldstone-type mode associated with a short-range interaction as the range is extended to infinity.
PACS: 52.27.Gr – Strongly-coupled plasmas / 52.27.Cm – Multicomponent and negative-ion plasmas / 52.35.Fp – Electrostatic waves and oscillations (e.g., ion-acoustic waves)
© EPLA, 2014
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