电流噪声揭示Bi $_{2}$ Se $_{3}$中可调谐高速原子转子
Tunable high speed atomic rotor in Bi$_{2}$Se$_{3}$ revealed by current noise
摘要：
使用扫描隧道显微镜（STM）操纵单个原子和分子的能力对于开发从纳米级电机和开关到量子计算机的大量原子级设备和结构至关重要。特别是分子马达由于其组装成复杂的纳米级机器的潜力而吸引了相当大的关注。尽管被操纵的原子或分子通常在衬底的顶部上，但是嵌入在晶格中的马达对于自下而上构造可以是非常有益的，并且可以另外用于探测晶格对主体材料的电子性质的影响。在这里，我们提出了控制操纵的转子在Fe掺杂Bi $_{2}$ Se $_{3}$的发现。我们发现，进入转子的电流，这可以与电压微调，驱动三个等效方向之间的全方位切换，其中每个可以冻结在小偏置电压。使用在1MHz的电流波动测量和模型模拟，我们估计，子nA电流的开关速率达到数百kHz。
英文摘要：
The ability to manipulate individual atoms and molecules using a scanning tunnelling microscope (STM) has been crucial for the development of a vast array of atomic scale devices and structures ranging from nanoscale motors and switches to quantum corrals. Molecular motors in particular have attracted considerable attention in view of their potential for assembly into complex nanoscale machines. Whereas the manipulated atoms or molecules are usually on top of a substrate, motors embedded in a lattice can be very beneficial for bottom-up construction, and may additionally be used to probe the in uence of the lattice on the electronic properties of the host material. Here, we present the discovery of controlled manipulation of a rotor in Fe doped Bi$_{2}$Se$_{3}$. We find that the current into the rotor, which can be finely tuned with the voltage, drives omni-directional switching between three equivalent orientations, each of which can be frozen in at small bias voltage. Using current fluctuation measurements at 1MHz and model simulations, we estimate that switching rates of hundreds of kHz for sub-nA currents are achieved.
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