Research Data supporting "Helicity-dependent Ultrafast Photocurrents in Weyl Magnet Mn3Sn"

This represents the data set for the figures shown on the article “Helicity-dependent Ultrafast Photocurrents in Weyl Magnet Mn3Sn”, published on arXiv:2302.07286. Fig.1b – Amplitude of the detected THz signal polarised along y, i.e. perpendicular to the direction of the magnetic field. For these measurements Mn3Sn was optically pumped with laser pulses of different polarisations. The folder Fig.1(b) contains the raw data, obtained as averaging of several measurements, from which the amplitude is extracted, and for the different polarisations of the pump. Fig.2a-d – Amplitude of the emitted THz signal in different experimental configurations as described in Fig. 1(a) of the article and for different polarisations of the pump. Each of the folders Fig.2(a), Fig.2(b), Fig.2(c) and Fig.2(d) contains a sub-folder named “THz transients” where the raw transients from which the amplitude is extracted is shown. The details of the experiment in which each set of data was collected are described below: Fig.2a – measurements were taken in configuration 2 with a tilting angle of 25 deg., at room temperature and with no magnetic field applied. Fig.2b – measurements were taken in configuration 3 with a tilting angle of 15 deg., at room temperature and with no magnetic field applied. Fig.2c – measurements were taken in configuration 3 with a tilting angle of 15 deg. And 30 deg., at room temperature and with no magnetic field applied. Fig.2d – measurements were taken in configuration 3 with a tilting angle of 15 deg. And -15 deg., at room temperature and with no magnetic field applied. Fig.3a - THz signals amplitude measured at 380 K in configuration 3 and for different pump polarisations after field-cooling from 420 K with opposite directions of external magnetic field continuously applied along x. The raw data of the THz transient from which the amplitude was extracted is shown in the sub-folder “THz transients” in the folder “Fig.3(a)”. Fig.3b – Amplitude of the THz transient in configuration 3 for different pump polarisations before and after an in-plane rotation of the film by 90◦ . Prior to the measurements the sample was cooled down from 420 K to room temperature with a magnetic field of +860mT applied. The field was switched off at room temperature before measuring the THz transient. The raw data of the THz transient from which the amplitude was extracted is shown in the sub-folder “THz transients” in the folder “Fig.3(b)”.

本数据集对应发表于arXiv:2302.07286的论文《Weyl磁体Mn3Sn中依赖偏振手性的超快光电流》中的配图数据。
图1b：沿y方向（即垂直于磁场方向）偏振的探测太赫兹（THz）信号振幅。本次测量采用不同偏振态的激光脉冲对Mn3Sn样品进行光泵浦。Fig.1(b)文件夹内存储了多次测量的平均原始数据，从中可提取得到不同泵浦偏振条件下的信号振幅。
Fig.2a-d：不同实验配置下发射的太赫兹信号振幅，实验配置详见论文图1(a)，且涵盖多种泵浦偏振态。Fig.2(a)、Fig.2(b)、Fig.2(c)及Fig.2(d)文件夹均包含名为“THz transients”的子文件夹，其中存放了用于提取振幅的原始太赫兹瞬态信号数据。
各数据集对应的实验细节如下：
Fig.2a：实验采用配置2，倾斜角为25°，实验环境为室温，未施加外磁场。
Fig.2b：实验采用配置3，倾斜角为15°，实验环境为室温，未施加外磁场。
Fig.2c：实验采用配置3，倾斜角分别为15°与30°，实验环境为室温，未施加外磁场。
Fig.2d：实验采用配置3，倾斜角分别为15°与-15°，实验环境为室温，未施加外磁场。
Fig.3a：在配置3下，于380K温度下测量的太赫兹信号振幅。该实验为先从420K以沿x轴方向的恒定反向外磁场进行场冷，随后施加不同泵浦偏振态。用于提取振幅的太赫兹瞬态原始数据，存储于“Fig.3(a)”文件夹内的“THz transients”子文件夹中。
Fig.3b：配置3下，薄膜在面内旋转90°前后，不同泵浦偏振态对应的太赫兹瞬态信号振幅。测量前，样品先在+860毫特斯拉的外磁场作用下从420K冷却至室温，且在室温下测量前关闭外磁场。用于提取振幅的太赫兹瞬态原始数据，存储于“Fig.3(b)”文件夹内的“THz transients”子文件夹中。