Title: 1D Structures for Topological Quantum Devices
Abstract: Topological states such as Majorana modes provide unique pathways to fault-tolerant quantum computing. Recent progress in this direction has been enabled by novel proximity effects between low-dimensional semiconductors and superconductors. However, further breakthroughs require developing a systematic understanding of the materials systems and devices, with a particular attention to integrating magnetic materials with semiconductors and superconductors in 1D. In addition, understanding the role of disorder is essential for achieving robust topological states. I will discuss how magnet-semiconductor nanowire hybrid devices can provide unprecedented insight into the basic effects that underpin the realization of Majorana modes, notably the essential, but so far elusive helical state. A second key challenge is that of developing a platform for topological quantum computing that is not only robust at the single-device level, but that simultaneously holds the potential to be scalable into more complex systems. To this end, the integration of magnets with semiconductor nanowires is also uniquely promising. I will describe our efforts to search systematically for the optimal combinations of magnetic and semiconducting low-dimensional materials, guided by DFT calculations. Finally, with regards to both robustness and scalability, it may be useful to consider materials systems beyond semiconductor hybrid devices. I will discuss a conceptually new experimental approach that is semiconductor-free and intrinsically scalable.
Oct 14: 2pm -3:30pm: 1201 Toll Physics Bldg This seminar will also be broadcast via ZOOM: https://umd.zoom.us/j/91301075848 Note: there will NOT be receptions prior to the talk until further notice.