Payagala Shamith U, Rigosi Albert F, Panna Alireza R, Pollarolo Alessio, Kruskopf Mattias, Schlamminger Stephan, Jarrett Dean G, Brown Ryan, Elmquist Randolph E, Brown Duane, Newell David B
National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
Measurements International, Ltd., Prescott, Ontario, K0E 1T0, Canada.
IEEE Trans Instrum Meas. 2020;69:9374-9380. doi: 10.1109/tim.2020.3004678.
A graphene quantized Hall resistance (QHR) device fabricated at the National Institute of Standards and Technology (NIST) was measured alongside a GaAs QHR device fabricated by the National Research Council of Canada (NRC) by comparing them to a 1 kΩ standard resistor using a cryogenic current comparator. The two devices were mounted in a custom developed dual probe that was then assessed for its viability as a suitable apparatus for precision measurements. The charge carrier density of the graphene device exhibited controllable tunability when annealed after Cr(CO) functionalization. These initial measurement results suggest that making resistance comparisons is possible with a single probe wired for two types of quantum standards - GaAs, the established material, and graphene, the newer material that may promote the development of more user-friendly equipment.
在美国国家标准与技术研究院（NIST）制造的一个石墨烯量子化霍尔电阻（QHR）器件，与加拿大国家研究委员会（NRC）制造的一个砷化镓QHR器件一起，通过使用低温电流比较器将它们与一个1 kΩ标准电阻进行比较来进行测量。这两个器件被安装在一个定制开发的双探针中，然后评估该双探针作为精密测量合适仪器的可行性。石墨烯器件的电荷载流子密度在Cr(CO)功能化后退火时表现出可控的可调性。这些初步测量结果表明，使用为两种量子标准——已确立的材料砷化镓和可能推动更用户友好型设备发展的新材料石墨烯布线的单个探针进行电阻比较是可行的。
