Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 11: Majorana Physics

TT 11.1: Vortrag

Montag, 1. April 2019, 15:00–15:15, H4

Kitaev spin liquid at quantum criticality and beyond — •Dirk Wulferding^1,2, Youngsu Choi³, Yann Gallais⁴, Peter Lemmens^1,2, Seunghwan Do⁵, and Kwang-Yong Choi³ — ¹IPKM, TU-BS, Braunschweig, Germany — ²LENA, TU-BS, Braunschweig, Germany — ³Chung-Ang Univ., Seoul, Korea — ⁴Univ. Paris-Diderot, Paris, France — ⁵MPK / POSTECH, Pohang, Korea

The honeycomb lattice α-RuCl₃ is among the most promising candidates to realize a Kitaev spin liquid [1] that hosts Majorana fermions. In applied magnetic fields, the low temperature zig-zag antiferromagnetic order is suppressed, and α-RuCl₃ approaches quantum criticality at H_c = 6.5 T [2,3]. Our Raman study reveals distinct changes in low energy magnetic excitations as a function of applied fields. Based on a detailed temperature analysis [4,5] we comment on the fate of Majorana fermionic excitations and multiparticle quasiparticles at and beyond the quantum critical point.

Work supported by QUANOMET NL-4 and DFG LE967/16-1.
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