Magneto-optics of atomically thin two-dimensional materials

简介：随着石墨烯的发现，一大类层状晶体引起了人们的极大关注。这些材料的性能范围从超导体和金属，到半导体和绝缘体。这种少数原子层形式的量子材料的性质受到极薄的晶体对电子激发的量子限制的强烈影响。令人惊讶的是，存在一系列层状铁磁材料，即使在原子单层形式下也能保持其铁磁性。这种2D材料将给电子设备和存储设备带来革命性的变化，并将在量子技术中有广泛的应用，特别是与其他层状半导体的结合。在这个博士项目中，学生将探索新的铁磁性少数原子层材料，致力于推进它们的制备，并将开发将这些材料与其他2D单层晶体相结合的方法，包括磁性材料、石墨烯和过渡金属二卤化物(TMD)。其目标是利用二维铁磁材料在纳米尺度上产生的非常大的局部磁场来制造和探索新型光电子器件。实验目标之一将是学习如何利用光学表征技术，如拉曼散射、光致发光和反射对比来揭示几层材料中的磁序。

Intro: Following the discovery of graphene, a large family of layered crystals has attracted significant attention. The properties of these materials range from superconductors and metals, to semiconductors and insulators. Properties of such quantum materials in a few-atomic-layer form are strongly influenced by the quantum confinement of the electronic excitations due to the extreme crystal thinness. Surprisingly, a family of layered ferromagnetic materials exists, which preserve their ferromagnetic properties even in an atomic monolayer form. Such 2D materials will revolutionise electronics, memory devices, and will have broad applications in quantum technologies, particularly in combination with other layered semiconductors. Description of PhD: In this PhD project the student will explore novel ferromagnetic few atomic layer materials, will work on advancing their fabrication, and will develop methods for combining such materials with other 2D monolayer crystals, including magnetic materials, graphene and transition metal dichalcogenides (TMDs). The goal is to fabricate and explore novel types of opto-electronic devices taking advantage of very large local magnetic field generated by 2D ferromagnetic materials on the nano-scale. One of the experimental goals will be to learn how to employ optical characterisation techniques such as Raman scattering, photoluminescence and reflectance contrast to reveal the magnetic order in the few-layer material.