Quantum transport in two-dimensional topological materials

Phenomena originating from electron correlations and non-trivial band topology have become one of the main research areas in modern condensed matter physics. Many classes of materials have emerged including ferromagnets, superconductors, topological insulators, Mott insulators, Dirac/Weyl semimetals and quantum anomalous Hall insulators (QAHI). Moreover, when such materials are combined, new phenomena and functionalities emerge, such as Majorana states, which promise to enable topological quantum computation. While major research efforts have been dedicated to studying such phenomena in conventional 3D materials, the tremendous potential of 2D materials remains largely unexplored. Since these phenomena emerge from interface-mediated coupling in low-dimensionality (e.g. interfacing a QAHI and a superconductor), 2D materials and related layered systems are an ideal platform.

In this project, we will combine state-of-the art nanofabrication of novel device concepts based on different topological materials with transport measurements performed at ultra-low temperatures, which are essential to reveal quantum effects that are otherwise hidden by thermal fluctuations. A recently acquired, cryogen-free, dilution refrigeration system with a base temperature below 10 mK, combined with the required microwave electronics and components, will be used to measure the aforementioned materials. The student will be responsible for this new equipment (installation 2023), which will give her/him the perfect platform to actively contribute to the exciting topic of quantum science and technology.