Quantum oscillations of the two-dimensional hole gas at atomically flat diamond surfaces
Quantum oscillations of the two-dimensional hole gas at atomically flat diamond surfaces
复制标题
原子平坦金刚石表面二维空穴气体的量子振荡
DOI：
10.1103/physrevb.89.235304
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发表时间：
2014
影响因子：
3.7
通讯作者：
and Hiroshi Kawarada
中科院分区：
文献类型：
--
作者：
Yamaguchi Takahide;Hiroyuki Okazaki;Keita Deguchi;Shinya Uji;Hiroyuki Takeya;Yoshihiko Takano;Hidetoshi Tsuboi;and Hiroshi Kawarada
利用离子液体的电场效应，在氢原子封端的金刚石表面引入高密度空穴载流子，观察到了Shubnikov-de哈斯振荡。Shubnikov-de哈斯振荡仅依赖于垂直于金刚石表面的磁场分量，从而提供了二维费米面的证据。从振荡的温度依赖性估计的有效质量接近金刚石中的价带最大值的回旋有效质量。估计的量子散射时间比输运散射时间长一个数量级，表明载流子迁移率在低温下局部高达几千cm/V s。
Shubnikov–de Haas oscillations are observed in atomically flat hydrogen-terminated diamond surfaces with high-density hole carriers introduced by the electric field effect using an ionic liquid. The Shubnikov–de Haas oscillations depend only on the magnetic field component perpendicular to the diamond surface, thus providing evidence of two-dimensional Fermi surfaces. The effective masses estimated from the temperature dependence of the oscillations are close to the cyclotron effective masses of the valence band maxima in diamond. The estimated quantum scattering time is one order of magnitude longer than the transport scattering time and indicates that the carrier mobility is locally as high as several thousand cm/V s at low temperature.