Exfoliated two-dimensional ferromagnets probed by spin polarized scanning tunneling microscopy and photoelectron spectroscopy

本项目采用自旋极化扫描隧道能谱、自旋极化角光电子能谱、自旋极化光电子显微镜等表面科学技术，研究剥离制备的范德华型二维铁磁体和反铁磁体的性质。原子薄片（CrBr3, Fe3GeTe2，…）在手套箱中剥离，并在超高真空中在黑暗中转移到测量装置。这避免了在环境条件下迅速发生的氧化。通过绘制自旋极化带结构、成像域模式和探测自旋极化局部态密度，我们首先解决了由开创性实验引起的开放性问题，例如磁性的门调谐的起源。此外，我们的目标是通过实验建立理论上已经得到充分研究的磁性二维模型的可调版本，例如Heisenberg， Ising或XY模型，旨在直接成像涡/反涡型激励。

This project employs surface science techniques such as spin polarized scanning tunneling spectroscopy, spin polarized angular photoelectron spectroscopy and spin-polarized photoelectron microscopy to study the properties of van-der-Waals type two-dimensional ferro- and antiferromagnets prepared by exfoliation. The atomically thin flakes (CrBr3, Fe3GeTe2,...) are exfoliated in a glove box and transferred in ultrahigh vacuum within the dark to the measurement setups. This avoids oxidation that occurs rapidly at ambient conditions. By mapping the spin-polarised band structure, imaging domain patterns, and probing the spin-polarized local density of states, we firstly tackle open issues resulting from the pioneering experiments such as the origin of the demonstrated gate tuning of the magnetic properties. Additionally, we aim to experimentally establish tunable versions of theoretically well-studied magnetic 2D models such as Heisenberg, Ising or XY model aiming, e.g., at a direct imaging of vortex/antivortex-type excitations.