Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 59: Posters Magnetism III
MA 59.45: Poster
Friday, March 20, 2020, 09:00–12:00, P2/EG
Topological excitations in the Shastry-Sutherland model compound SrCu2(BO3)2 — •Dirk Wulferding1,2, Peter Lemmens1,2, Youngsu Choi3, Kwang-Yong Choi3, and Hiroshi Kageyama4 — 1IPKM, TU-BS, Braunschweig, Germany — 2LENA, TU-BS, Braunschweig, Germany — 3Chung-Ang Univ., Seoul, Korea — 4Chemistry Dept., Kyoto Univ., Japan
In the Shastry-Sutherland model compound SrCu2(BO3)2 the ground state is composed of orthogonal spin dimers with low-energy triplon excitations and bound states [1]. In applied magnetic fields of around 1.4 T a topological phase transition is induced, where magnon bands acquire a finite Chern number together with the formation of topologically protected edge states [2,3] - realizing a magnetic analogue of a topological insulator. At higher fields around 27 T a 1/8 magnetization plateau corresponding to the crystallization of triplons appears [4]. Our Raman spectroscopic study at low and high magnetic fields probes the magnetic excitations in the singlet sector through the topological phase transitions. Work supported by QUANOMET NL-4 and DFG LE967/16-1. [1] P. Lemmens, et al., Phys. Rev. Lett. 85, 2605 (2000). [2] J. Romhanyi, et al., Nat. Commun. 6, 6805 (2015). [3] P. A. McClarty, et al., Nat. Phys. 13, 736 (2017). [4] H. Kageyama, et al., Phys. Rev. Lett. 82, 3168 (1999).