论文标题
Wigner晶体在Quantum Hall高原的电容响应
Capacitive Response of Wigner Crystals at the Quantum Hall Plateau
论文作者
论文摘要
在本报告中，我们研究具有高精度电容测量的二维（2D）电子/孔系统。我们发现，当2D电导率显着降低时，电容电荷仅出现在高磁场的栅极边缘。在Integer Quantum Hall效应中，电容在高温下消失并形成高原$ T \ gtrsim 300 $ MK，令人惊讶的是，它以$ t \ lessim 100 $ MK消失。这种异常行为可能是一种表现，是最高的Landau水平的稀释颗粒/空位形式的Wigner Crystal，其具有有限的可压缩性，并且可以容纳极化电流。
In this report, we study ultra-high-mobility two-dimensional (2D) electron/hole systems with high precision capacitance measurement. We find that the capacitance charge appears only at the fringe of the gate at high magnetic field when the 2D conductivity decreases significantly. At integer quantum Hall effects, the capacitance vanishes and forms a plateau at high temperatures $T\gtrsim 300$ mK, which surprisingly, disappears at $T\lesssim 100$ mK. This anomalous behavior is likely a manifestation that the dilute particles/vacancies in the top-most Landau level form Wigner crystal, which has finite compressibility and can host polarization current.
