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arXiv 2008.07506cond-mat.mes-hall
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超越普适范围的库仑阻塞测温法

Coulomb blockade thermometry beyond the universal regime

Nikolai Yurttagül, Matthew Sarsby, Attila Geresdi

摘要:

单电子在介观金属岛上的电荷局域化导致电流的抑制,称为库仑阻塞。当这种修正很小时,它使初级电子测温成为可能,正如Pekola等人(Phys. Rev. Letters,73,2903 [1994])首次证明的那样。然而,在低温极限下,随机电荷偏移影响电导并限制单个金属岛的普遍行为。在这项工作中,我们用数值方法研究了结阵列的电导,并证明了大型阵列的主要制度的延伸,即使在设备参数的变化被考虑在内。我们发现,我们的模拟同意与测量的电导痕迹在submillikelvin电子温度制度。

英文摘要:

The charge localization of single electrons on mesoscopic metallic islands leads to a suppression of the electrical current, known as the Coulomb blockade. When this correction is small, it enables primary electron thermometry, as it was first demonstrated by Pekola et al. (Phys. Rev. Letters, 73, 2903 [1994]). However, in the low temperature limit, random charge offsets influence the conductance and limit the universal behavior of a single metallic island. In this work, we numerically investigate the conductance of a junction array, and demonstrate the extension of the primary regime for large arrays, even when the variations in the device parameters are taken into account. We find that our simulations agree well with measured conductance traces in the submillikelvin electron temperature regime.

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