Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.70: Poster
Dienstag, 13. März 2018, 09:30–13:00, Poster A
Magnetic Majorana fermions observed in the diluted Kitaev materials α-Ru1-xIrxCl3 — •Youngsu Choi1,2, Dirk Wulferding1,3, Peter Lemmens1,3, Seunghwan Do2, and Kwang-Yong Choi2 — 1IPKM, TU-BS, Braunschweig, Germany — 2Chung-Ang Univ., Seoul, Korea — 3LENA, TU-BS, Braunschweig, Germany
A Kitaev honeycomb lattice is a paradigmatic model that hosts Kitaev spin liquid and Majorana fermions. However, their experimental identification remains elusive in real Kitaev materials as non-Kitaev terms often induce a magnetically ordered state. We introduce spin vacancies to overcome this deadlock. In the diluted Kitaev materials α-Ru1-xIrxCl3, Raman scattering measurements uncover that moderate spin vacancies destabilize the zigzag antiferromagnetic order towards a short-range ordered state, while well-defined Majorana fermion excitations emerge under sizable dilutions. Furthermore, a structural evolution with Ir content is characterized by studying phonon modes.
Work supported by the Quantum- and Nanometrology initiative QUANOMET within project NL-4, the NTH School Contacts in Nanosystems and Korea NRF Grants (No. 2012-046138).