一维周期基底上二维液体尘埃等离子体的声子谱
Phonon spectra of two-dimensional liquid dusty plasmas on a one-dimensional periodic substrate
摘要：
利用数值模拟方法研究了一维周期基底上二维液体尘埃等离子体的声子谱。由于尘埃粒子被衬底最小值限制，所以穿过衬底的势阱的波的传播被抑制。如果衬底阱窄或深，则在每个极小值中形成一维粒子链，并且单个链的纵向运动支配波沿着衬底的势阱的传播。增加基底最小值的宽度或减小基底最小值的深度允许颗粒屈曲成锯齿形结构，并且由此产生的光谱形成两个分支，一个用于晃动运动，一个用于呼吸运动。相邻尘埃粒子之间的排斥力产生小波数的晃动波的向后传播。
英文摘要：
We investigate the phonon spectra of two-dimensional liquid dusty plasmas on a one-dimensional periodic substrate using numerical simulations. The propagation of the waves across the potential wells of the substrate is inhibited due to the confinement of the dust particles by the substrate minima. If the substrate wells are narrow or deep, one-dimensional chains of particles are formed in each minima, and the longitudinal motion of an individual chain dominates the propagation of waves along the potential wells of the substrate. Increasing the width or decreasing the depth of the substrate minima allows the particles to buckle into a zig-zag structure, and the resulting spectra develop two branches, one for sloshing motion and one for breathing motion. The repulsion between neighboring dust particles produces backward propagation of the sloshing wave for small wave numbers.
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