液氦中表面电子的低温迁移率和波纹声子相互作用
Low-Temperature Mobility of Surface Electrons and Ripplon-Phonon Interaction in Liquid Helium
摘要：
超流氦表面上的二维电子系统的低温直流迁移率是由纵向动量转移到散装液体的最慢阶段决定的，即由液氦的表面和体积激发的相互作用决定的，它随温度迅速降低。因此，低频迁移率的温度依赖关系为μ_{dc} = 8.4 × 10 ^{-11}n_e T^{-20/3} cm ^4 K^{20/3}/（Vs），其中n_e为表面电子密度。得到了加压电场（kV/cm）与温度（K）的关系T^{20/3}E_ \perp^{-3} <<2 × 10 ^{-7}，驱动场频率ω<10 ^8 T^5 K^{-5}s^{-1}，在此条件下可以观察到上述效应。特别地，E_ \perp = 1 kV/cm对应于T < 70 mK和ω/2π< 30 Hz。
英文摘要：
The low-temperature dc mobility of the two-dimensional electron system localized above the surface of superfluid helium is determined by the slowest stage of the longitudinal momentum transfer to the bulk liquid, namely, by the interaction of surface and volume excitations of liquid helium, which rapidly decreases with temperature. Thus, the temperature dependence of the low-frequency mobility is μ_{dc} = 8.4x10^{-11}n_e T^{-20/3} cm^4 K^{20/3}/(V s), where n_e is the surface electron density. The relation T^{20/3}E_\perp^{-3} << 2x10^{-7} between the pressing electric field (in kV/cm) and temperature (in K) and the value ω< 10^8 T^5 K^{-5}s^{-1} of the driving-field frequency have been obtained, at which the above effect can be observed. In particular, E_\perp = 1 kV/cm corresponds to T < 70 mK and ω/2π< 30 Hz.
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