DOI: 10.5281/zenodo.6498344
title: Dataset for 'Unveiling the charge distribution of a GaAs-based nanoelectronic device'

description: *********************************************************<br> This repository contains the raw experimental data associated with the manuscript<br> "Unveiling the charge distribution of a GaAs-based nanoelectronic device: A large experimental data-set approach"<br> by Eleni Chatzikyriakou, Junliang Wang et al.<br> See Arxiv:2205.00846 for more details. <br> ********************************************************* ***************************************<br> Content of the different data files<br> *************************************** The data are stored in 5 different files in the csv format. * data_1D_4K.csv: current versus gate voltage data for all the samples at 4K. <br> The same gate voltage is applied on the Top and bottom gates. For sample X1Y3, X2Y3, X5Y3 and X6Y3 some additional measurements have been realised : * data_1D_mk.csv : top and bottom gates of each QPC have been swept at the same time at 50 mK temperature. * data_2D_4K_TB.csv : top gate has been swept for different values of the bottom gate at 4K.<br> * data_2D_mK_TB.csv : top gate has been swept for different values of the bottom gate at 50 mK temperature.<br> * data_2D_mK_BT.csv : bottom gate has been swept for different values of the top gate at 50 mK temperature. ***********************************<br> Format of the csv files<br> *********************************** --- All the data files are in the following format. * A given curve "current versus gate voltage" is stored in two consecutive raws. The first one contains the value of the measured current, the second one contains the values of the applied<br> gate voltages. * A 2D measurement "current versus top gate and bottom gate" is stored in three consecutive raws. The first one contains the value of the measured current, the second one contains the list of values of voltage applied on one of the gate. The third third raw contains the list of values of voltage applied on the other gate. --- Each row of a csv file has the following format: * The first column identifies the quantum point contact and the quantity. The format is Xx_Yy_QpcNb_Meas.<br> - Xx is the column on the chip (from X1 to X6).<br> - Yy is the row on the chip (Y1, Y2 or Y3).<br> - QpcNb is the number of the qpc (from 1 to 8 or from 9 to 16).<br> - Meas is the reported quantity, either the (measured) "current" or the (applied) "voltage"<br> or the "TopVoltage" or "BotVoltage" for 2D scans. * The second column is the unit (A or V). * The third column is the number of sweeps (1, 2 or 3) performed. <br> For some measurements, the same sweep has been done multiple times. * The fourth column is the design of the quantum point contact (A, B, C, D or E). * All the following columns contain the measured value. For 2D scans the different values of the gate corresponding to the third raw are placed one after the other. *******************************<br> Python scripts for data analysis<br> ******************************* For convenience, we provide an example python scripts that can be used to load the data and plot them. extract.py : Extracts the data into a dictionary and plots the I-V characteristics<br> extract.ipynb : jupyter notebook using the different functions of extract.py type -h for help