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2D electrons floating on a suspended atomically thin dielectric

机译：浮在悬浮的原子薄电介质上的2D电子

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摘要

The 2D electrons trapped in vacuum near the atomically thin dielectric (ATD, mono- or N-layer film of h-BN or transition metal dichalcoge-nide) are considered. ATD is suspended above the back gate and forms the capacitor, which is controlled by the biased voltage determining 2D concentration, n_(2d). It is found that the leakage current through ATD is negligible, and the effect of the polarizability of ATD is weak if N ≤ 5. At temperatures T = 0.1-15K and n_(2d) = 5×10~8-10~(10)cm~2, one deals with the Boltzmann liquid having a macroscopic thickness of ～100 A. Due to the bending of ATD, the quadratic dispersion law of the flexural vibrations is transformed into the linear one at small wave vectors. The scattering processes of the electrons caused by these phonons or the monolayer islands on ATD are examined and the momentum and energy relaxation rates are analyzed based on the corresponding balance equations. The momentum relaxation times vary over orders of magnitude in the above region (T, n_(2d)) and N. The response may change from the polaron transport, for a perfect single-layer ATD at low T and high n_(2d). to the high-mobility (≥ 10~7 cm~2/V s) regime at high T and low n_(2d). The quasi-elastic energy relaxation due to phonon-induced scattering is considered, and the conditions for the heating of electrons by a weak in-plane electric field are found.
机译：考虑在原子薄电介质（ATD，单层或H-BN或过渡金属二均焦胶叶型-9Aide）附近真空捕获的2D电子。 ATD悬挂在后栅极上方并形成电容器，该电容由偏置电压确定2D浓度，N_（2D）控制。发现通过ATD的漏电流可忽略不计，如果n≤5，则ATD的极化性的效果较弱。在温度下，在温度下= 0.1-15k和n_（2d）= 5×10〜8-10〜（10 ）Cm〜2，一个涉及宏观厚度为〜100a的螺栓灯液。由于ATD的弯曲，弯曲振动的二次分散定律在小波矢量下转换成线性。由这些声子引起的电子散射过程或由ATD上的单层岛屿进行检查，并且基于相应的平衡方程分析动量和能量松弛率。动量松弛时间在上述区域（T，N_（2D））和N.响应可以从极化单层ATD处变化，在低T和高N_（2D）中，响应可以改变响应。在高T和低N_（2D）的高迁移率（≥10〜7cm〜2 / v s）方案。考虑了由声子诱导的散射引起的准弹性能量松弛，并且发现通过弱的面内电场加热电子的条件。

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  • 来源
    《Journal of Applied Physics》 |2021年第20期|204301.1-204301.12|共12页
  • 作者

    F. T. Vasko;

  • 作者单位

    QK Applications Monterey California 93940 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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