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arXiv 0708.1995cond-mat.mes-hall
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作为量化电流源的混合单电子晶体管

Hybrid single-electron transistor as a source of quantized electric current

Jukka P. Pekola, Juha J. Vartiainen, Mikko Mottonen, Olli-Pentti Saira, Matthias Meschke, Dmitri V. Averin

摘要:

大约二十年前,单电子学的兴起奠定了在固态器件中同步操纵单个电子的基础。低温环境下的超小结构形成了一个接一个地寻址电子的理想域。在该领域中长期存在的挑战是实现与工作频率$f$精确相关的电流源。迫切需要电流的量子标准和所谓的欧姆三角形,其中通过欧姆定律测试来自约瑟夫森效应的电压和来自量子霍尔效应的电阻相对于电流,以检查自然界基本常数$\hbar$和$e$的一致性。已经报道了几种尝试来创建符合极高精度、高产率和实现不具有太多控制参数的苛刻标准的电流源。然而,尽管多年来取得了许多巧妙的成就,但迄今还没有令人满意的解决办法。在这里,我们提出并证明了具有一个栅极的单岛单电子晶体管形式的混合金属-超导体旋转门的意想不到的概念,它在我们当前测量的不确定性范围内在多个级别的$ef$上显示出稳健的电流平台。我们的理论估计表明,本系统的误差可以有效地抑制进一步优化的设计和适当的选择的设备参数,因此,我们希望它最终满足严格的规格的量子精密测量。

英文摘要:

The basis of synchronous manipulation of individual electrons in solid-state devices was laid by the rise of single-electronics about two decades ago. Ultra-small structures in a low temperature environment form an ideal domain of addressing electrons one by one. A long-standing challenge in this field has been the realization of a source of electric current that is accurately related to the operation frequency $f$. There is an urgent call for a quantum standard of electric current and for the so-called metrological triangle, where voltage from Josephson effect and resistance from quantum Hall effect are tested against current via Ohm's law for a consistency check of the fundamental constants of Nature, $\hbar$ and $e$. Several attempts to create a metrological current source that would comply with the demanding criteria of extreme accuracy, high yield, and implementation with not too many control parameters have been reported. However, no satisfactory solution exists as yet despite many ingenious achievements that have been witnessed over the years. Here we propose and prove the unexpected concept of a hybrid metal-superconductor turnstile in the form of a one-island single-electron transistor with one gate, which demonstrates robust current plateaus at multiple levels of $ef$ within the uncertainty of our current measurement. Our theoretical estimates show that the errors of the present system can be efficiently suppressed by further optimizations of design and proper choice of the device parameters and therefore we expect it to eventually meet the stringent specifications of quantum metrology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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