发表机构
The Pennsylvania State University（宾夕法尼亚州立大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究提出通过后处理轨迹模拟校正像差，实现高分辨率磁角分辨光电子能谱，并确定关键技术要求，为更大磁场下的应用提供路线图。
AI 中文摘要
磁场对量子现象的控制和扰动是材料研究中不可或缺的工具。近年来，原位磁场调控被引入角分辨光电子能谱（magneto-ARPES），该方法能够直接提供与磁场相关的电子结构的动量分辨和能量分辨信息。然而，研究表明电子轨迹的像差相当显著，即使在较小磁场下也会导致严重的光谱畸变和展宽。在此，我们证明即使在存在强轨迹像差的情况下，也能从magneto-ARPES光谱中高精度地恢复电子结构，同时保持高动量分辨率。我们使用基于激光的ARPES系统研究了线圈偶极场中的Bi$_2$Se$_3$。通过详细的电子轨迹模拟，在后处理中重建了电子结构。我们确定二维（2D）动量映射、微米级束斑尺寸和精确的数值场模拟是高分辨率magneto-ARPES的关键技术要求。我们展示了圆二色性如何提供关于磁场与自旋耦合的额外信息。我们的实验成果和模拟中的标度律为在更大磁场下实现magneto-ARPES提供了路线图。
英文摘要
The control and perturbation of quantum phenomena with magnetic fields is an indispensable tool in materials research. Recently, in-situ field tuning was implemented into angle-resolved photoemission spectroscopy (magneto-ARPES), which provides direct momentum and energy-resolved information of the field-dependent electronic structure. However, aberrations of the electron trajectories were shown to be substantial, leading to significant spectral distortions and broadening even in small fields. Here we show that the electronic structure can be recovered from magneto-ARPES spectra with high accuracy while maintaining high momentum resolution even when strong trajectory aberrations are present. We studied Bi$_2$Se$_3$ in a dipole field of a coil using a laser-based ARPES system. The electronic structure was reconstructed in post-processing using detailed electron trajectory simulations. We identify two-dimensional (2D) momentum mapping, a micron beam spot size, and precise numerical field simulations as critical technical requirements for high-resolution magneto-ARPES. We show how circular dichroism can provide additional information about the coupling of the magnetic field to the spin. The experimental achievements and the scaling laws from our simulations provide a road map towards magneto-ARPES in larger fields.
