有限尺寸电子晶体在微通道超流He-4表面的滑动
Sliding of Electron Crystal of Finite Size on the Surface of Superfluid He-4 Confined in a Microchannel
摘要：
我们提出了一个新的研究二维电子晶体的非线性输运的表面上的液氦限制在一个10微米宽的通道，其中的晶体的有效长度可以从10到215微米变化。在低驱动电压下，移动的电子晶体强烈地耦合到由表面毛细波（ripplon）的共振激发引起的液体表面的变形，而在较高驱动电压下，晶体从变形中分离。我们发现强烈的依赖性的驱动电场作用于电子的退耦阈值，晶体的大小。特别地，当晶体的长度变得短于25微米时，阈值电场显著降低。我们解释这种效应所产生的减弱表面变形由于辐射损失的共振激发的涟漪从有限大小的电子晶体，我们占观察到的效果使用一个有指导意义的分析模型。
英文摘要：
We present a new study of the nonlinear transport of a two-dimensional electron crystal on the surface of liquid helium confined in a 10 micrometer-wide channel in which the effective length of the crystal can be varied from 10 to 215 micrometers. At low driving voltages, the moving electron crystal is strongly coupled to deformation of the liquid surface arising from resonant excitation of surface capillary waves, ripplons, while at higher driving voltages the crystal decouples from the deformation. We find strong dependence of the decoupling threshold of the driving electric field acting on the electrons, on the size of the crystal. In particular, the threshold electric field significantly decreases when the length of the crystal becomes shorter than 25 micrometers. We explain this effect as arising from weakening of surface deformations due to radiative loss of resonantly-excited ripplons from an electron crystal of finite size, and we account for the observed effect using an instructive analytical model.
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