Electronic control of combined spin-orbit and magnetic exchange coupling in graphene van der Waals-heterostructures (CombSOC)

石墨烯范德华异质结构中组合自旋轨道和磁交换耦合的电子控制（CombSOC）

• 批准号: 443274823
• 负责人: Dr. Marko Klaus Burghard
• 金额: --
• 依托单位: Max-Planck-Institut für Festkörperforschung (MPI-FKF)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/443274823?language=en
• 关键词: Electronic; control; combined; spin; orbit

This project aims to combine spin-orbit coupling (SOC) and magnetic proximity effects in van der Waals heterostructures to imprint tailored and electrically tunable spin polarizations in the band structure of graphene. In undoped (2D magnet/graphene/2D SOC material) heterotrilayers, CombSOC envisions to experimentally demonstrate the in-plane magnetic anisotropies and topological gap openings close to the charge neutrality point of graphene arising from the combined proximity, and explore whether their strength can be controlled through external stimuli, such as an externally applied electric displacement field. By comparison, in charge transfer doped heterotrilayers, CombSOC seeks to reveal the induced spin polarizations far away from the charge neutrality point and their impact on emergent collective spin and charge excitations in the highly doped graphene layer. The double-proximitized graphene will be investigated by complementary electronic and optoelectronic spectroscopies. While magnetotransport experiments shall reveal the magnetic anisotropies and topological gap openings near the charge neutrality point, spin valve measurements will yield the spin lifetime anisotropy. Moreover, spin-dependent tunneling spectroscopy is utilized to quantify the spin polarizations away from the charge neutrality point. Using a time-resolved, resonant photocurrent spectroscopy in the near and mid-infrared regime, the symmetries and dynamics of the anisotropic photogalvanic currents, which are linked to the spin-dependent interband transitions in the proximitized graphene, will be fundamentally characterized.

该项目旨在将联合收割机自旋轨道耦合（SOC）和磁邻近效应结合在货车德瓦尔斯异质结构中，以在石墨烯的能带结构中压印定制的和电可调的自旋极化。在未掺杂的（2D磁体/石墨烯/2D SOC材料）异质三层中，CombSOC设想通过实验证明平面内磁各向异性和拓扑间隙开口靠近石墨烯的电荷中性点，并探索它们的强度是否可以通过外部刺激来控制，例如外部施加的电位移场。通过比较，在电荷转移掺杂的异质三层中，CombSOC试图揭示远离电荷中性点的诱导自旋极化及其对高度掺杂的石墨烯层中出现的集体自旋和电荷激发的影响。将通过互补电子和光电光谱来研究双邻近石墨烯。虽然磁输运实验将揭示磁各向异性和拓扑间隙开口附近的电荷中性点，自旋阀测量将产生自旋寿命各向异性。此外，自旋相关的隧道光谱被用来量化远离电荷中性点的自旋极化。使用时间分辨的，共振光电流光谱在近和中红外区，对称性和各向异性的光电流，这是链接到自旋相关的带间跃迁的邻近石墨烯的动力学，将从根本上表征。