Phys.org  August 29, 2024 Artificial quantum systems have emerged as platforms to realize topological matter in a well-controlled manner. However, the realization of many-body topological phases in solid-state platforms with atomic resolution has remained challenging. An international team of researchers (USA – Stevens Institute of Technology, China, Finland) engineered both topological and trivial phases of the quantum spin model and realized first- and second-order topological quantum magnets. They probed the many-body excitations of the quantum magnets by single-atom electron spin resonance with an energy resolution better than 100 neV. Using the atomically localized magnetic field of the scanning tunnelling microscope tip, […]