Direct comparison of 1 MΩ quantized Hall array resistance and quantum Hall resistance standard
Direct comparison of 1 MΩ quantized Hall array resistance and quantum Hall resistance standard
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DOI：
10.1088/1681-7575/aad070
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发表时间：
2018-10-01
期刊：
影响因子：
2.4
通讯作者：
Kaneko, Nobu-Hisa
中科院分区：
文献类型：
--
作者：
Chae, Dong-Hun;Kim, Wan-Seop;Kaneko, Nobu-Hisa
报道了用GaAs/AlGaAs异质结制作的1M欧米茄量子霍尔电阻阵列的精密测量结果。用低温电流比较器电阻电桥将填充因子为2的量子化霍尔阵列电阻直接与量子霍尔电阻标准进行比较，在95%的置信度下，相对测量不确定度为17×10(-9)。系统地研究了阵列中量子化的稳健性与温度、磁场和激励电流的关系。通过反复的热循环，我们观察到量子化的霍尔阵列电阻在相对测量不确定度内几乎不变，反映了接近1M欧米加的高电阻的不变性。这证明了1M欧米加的稳定量子力学电阻，以及用于小电流精确测量的真正电流-电压转换器的潜力。分别通过10k欧米茄电阻标准和填充因子为4时的霍尔阵列电阻平台的双重一致性检验，观察到的量化霍尔阵列电阻与设计值的相对偏差与相对测量不确定度相当。最后，讨论了相关的不确定度预算和测量偏差的来源。
We report precision measurements of a 1 M Omega quantum Hall resistance array made of GaAs/AlGaAs heterostructure. The quantized Hall array resistance at filling factor 2 is directly compared with the quantum Hall resistance standard with a cryogenic current comparator resistance bridge with a relative measurement uncertainty of 17 x 10(-9) at the 95% confidence level. The robustness of quantization in the array is systematically investigated with respect to the temperature, magnetic field, and excitation current. We observe through repeated thermal cycles that the quantized Hall array resistance is almost unchanged within the relative measurement uncertainty, reflecting the invariant nature of high resistance close to 1 M Omega. This demonstrates a stable quantum mechanical resistance of 1 M Omega as well as the potential for a genuine current-to-voltage converter for precision measurements of small current. The observed relative deviation of the quantized Hall array resistance from a designed value, verified by a double consistency check through a 10 k Omega resistance standard and the Hall array resistance plateau at filling factor 4, respectively, is comparable to the relative measurement uncertainty. Finally, the associated uncertainty budget and the origin of the measured deviation are discussed.