Graphene Quantum Hall Effect Devices for AC and DC Electrical Metrology.

用于交流和直流电计量的石墨烯量子霍尔效应器件。

• 影响指数: 3.221
• 发表时间: Jul 2021 1
• 来源期刊: IEEE Trans Electron Devices
• DOI: 10.1109/ted.2021.3082809
• PMID: 36452065
• 文章类型: Journal Article
• 中科院分区: Q1;Q1
• 作者列表: Kruskopf M,Bauer S,Pimsut Y,Chatterjee A,Patel DK,Rigosi AF,Elmquist RE,Pierz K,Pesel E,Götz M,Schurr J

关键词: Alternating current; dissipation factor; double-shield; epitaxial graphene; magnetocapacitance; magnetotransport; precision measurements; quantized Hall resistance (QHR) standards; quantum Hall effect (QHE); superconducting contacts

Abstract

A new type of graphene-based quantum Hall standards is tested for electrical quantum metrology applications at alternating current (ac) and direct current (dc). The devices are functionalized with Cr(CO)3 to control the charge carrier density and have branched Hall contacts based on NbTiN superconducting material. The work is an in-depth study about the characteristic capacitances and related losses in the ac regime of the devices and about their performance during precision resistance measurements at dc and ac.

摘要

测试了一种新型的基于石墨烯的量子霍尔标准，用于交流（ac）和直流（dc）下的电量子计量应用。该器件用Cr（CO）3功能化以控制电荷载流子密度，并具有基于NbTiN超导材料的分支霍尔触点。这项工作是对器件在交流状态下的特征电容和相关损耗以及在直流和交流精密电阻测量过程中的性能进行深入研究。