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arXiv 0807.0955cond-mat.mes-hallcond-mat.stat-mech
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氦上有电子的维格纳岛

Wigner islands with electrons over helium

E. Rousseau, D. Ponarin, L. Hristakos, E. Varoquaux, O. Avenel, Yu. Mukharsky

摘要:

我们在这里提出的第一个维格纳岛形成的电子浮在氦的实验研究。电子被静电捕获在一个由氦膜覆盖的介观结构中,表现为量子点。通过一个接一个地去除电子,我们能够找到附加谱,即从占据数为$N$的陷阱中添加(或提取)一个电子所需的能量。实验除了光谱进行比较与蒙特卡罗模拟的实际陷阱的几何形状,确认了有序状态的电子在岛上的氦。

英文摘要:

We present here the first experimental study of Wigner islands formed by electrons floating over helium. Electrons are trapped electrostatically in a mesoscopic structure covered with a helium film, behaving as a quantum dot. By removing electrons one by one, we are able to find the addition spectrum, i.e. the energy required to add (or extract) one electron from the trap with occupation number $N$. Experimental addition spectra are compared with Monte Carlo simulations for the actual trap geometry, confirming the ordered state of electrons over helium in the island.

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