Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
Phys Rev Lett. 2011 Oct 21;107(17):175003. doi: 10.1103/PhysRevLett.107.175003.
We analyze the acoustic collective excitations in two- and three-dimensional binary Yukawa systems, consisting of two components with different masses. A theoretical analysis reveals a profound difference between the weakly and strongly correlated limits: at weak coupling the two components interact via the mean field only and the oscillation frequency is governed by the light component. In the strongly correlated limit the mode frequency is governed by the combined mass, where the heavy component dominates. Computer simulations in the full coupling range extend and confirm the theoretical results.
我们分析了由两种不同质量的成分组成的二维和三维二元 Yukawa 系统中的声集体激发。理论分析揭示了弱耦合和强耦合极限之间的深刻差异：在弱耦合下，两个成分仅通过平均场相互作用，并且振荡频率由轻成分决定。在强相关极限下，模式频率由组合质量决定，其中重成分占主导地位。在全耦合范围内的计算机模拟扩展并证实了理论结果。
