---

Scanning probe microscopes have been very successful tools for studying individual atoms and molecules as well as complex surface structures. Systems which bear magnetic spin moments can be built with them on surfaces and stabilized in junctions. When such spins interact with each other or with the supporting electron baths, entanglement and correlated many-particle states can emerge, making them ideal prototypical quantum systems. In this talk I will show that experiments in conjunction with model Hamiltonians can be used as model systems to explore this fascinating quantum world, where symmetries are crucial not only for electronic [1] and magnetic properties [2] but also for the appearance of novel topological quantum phases [3, 4]. The tip as atomically sharp control element can be used to detail spin-spin correlations [5], to detect “dark” moments [6,7], and even to portray transitions between entirely different quantum phases [3]. 1. J. Martinez, et al., Comm. Mat. 3,57 (2022) 2. Y. Wang et al., Comm. Phys. 4, 103 (2021) 3. S, Arabi, et al., arXiv:2208.10377 (2022) 4. J. Martinez, et al., arXiv:2304.08142 (2023) 5. B. Verlhac et al., Science 366, 623 (2019) 6. M. Muenks et al., Nature Communications8, 14119 (2017) 7. M. Ternes et al. Phys Rev. Lett. 124, 167202 (2020)

---

Markus Ternes
Seminar Room of the Institute of Physics II
Contact: Wouter Jolie