Commensurability-Dependent Transport of a Wigner Crystal in a Nanoconstriction
Commensurability-Dependent Transport of a Wigner Crystal in a Nanoconstriction
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DOI：
10.1103/physrevlett.108.176801
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发表时间：
2012-04-25
影响因子：
8.6
通讯作者：
Kono, K.
中科院分区：
文献类型：
--
作者：
Rees, D. G.;Totsuji, H.;Kono, K.
我们首次对经典维格纳晶体通过分裂栅电极形成的收缩进行了传输测量。维格纳晶体是在微通道中限制的超流氦表面形成的。在低温下，电流随着分栅电压的增加而周期性地受到抑制，从而产生峰状传输特征。我们还展示了重现这种现象的分子动力学模拟结果。我们证明，在抑制电流的分栅电压下，电子晶格的排列使得粒子位置对抗热波动的稳定性得到增强。在这些配置中，由于电子间库仑力而抑制输运变得很重要。
We present the first transport measurements of a classical Wigner crystal through a constriction formed by a split-gate electrode. The Wigner crystal is formed on the surface of superfluid helium confined in a microchannel. At low temperatures, the current is periodically suppressed with increasing split-gate voltage, resulting in peaklike transport features. We also present the results of molecular dynamics simulations that reproduce this phenomenon. We demonstrate that, at the split-gate voltages for which the current is suppressed, the electron lattice is arranged such that the stability of particle positions against thermal fluctuations is enhanced. In these configurations, the suppression of transport due to interelectron Coulomb forces becomes important.