Assisted extraction of the energy level spacings and lever arms in direct current bias measurements of one-dimensional quantum wires, using an image recognition routine
Assisted extraction of the energy level spacings and lever arms in direct current bias measurements of one-dimensional quantum wires, using an image recognition routine
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DOI：
10.1063/1.4905484
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发表时间：
2015-01-07
影响因子：
3.2
通讯作者：
Smith, C. G.
中科院分区：
文献类型：
--
作者：
Lesage, A. A. J.;Smith, L. W.;Smith, C. G.
用多路复用器技术分别测量了单个GaAs/AlGaAs异质结上的256个分裂门阵列。这导致产生大量数据，这需要开发自动化数据分析例程。开发了一种算法来寻找离散能级之间的间距，这些离散能级是由于分裂门的横向限制而形成的。还从测量数据中找到了将分离栅极电压与能量联系起来的杠杆臂。这减少了分析所花费的时间。与目测值的比较表明，该算法返回了在1.4K下测量的分裂门的子带间距的可靠结果。该程序还被用于评估在较低温度(50mK)下的直流偏置光谱测量。这项技术是通用的，可以推广到其他类型的测量。例如，它被用来提取塞曼分裂的1D子带相互交叉的磁场。(C)2015 AIP出版有限责任公司。
A multiplexer technique is used to individually measure an array of 256 split gates on a single GaAs/AlGaAs heterostructure. This results in the generation of large volumes of data, which requires the development of automated data analysis routines. An algorithm is developed to find the spacing between discrete energy levels, which form due to transverse confinement from the split gate. The lever arm, which relates split gate voltage to energy, is also found from the measured data. This reduces the time spent on the analysis. Comparison with estimates obtained visually shows that the algorithm returns reliable results for subband spacing of split gates measured at 1.4 K. The routine is also used to assess direct current bias spectroscopy measurements at lower temperatures (50 mK). This technique is versatile and can be extended to other types of measurements. For example, it is used to extract the magnetic field at which Zeeman-split 1D subbands cross one another. (C) 2015 AIP Publishing LLC.