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Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 11: Majorana Physics

TT 11.1: Talk

Monday, April 1, 2019, 15:00–15:15, H4

Kitaev spin liquid at quantum criticality and beyond — •Dirk Wulferding1,2, Youngsu Choi3, Yann Gallais4, Peter Lemmens1,2, Seunghwan Do5, and Kwang-Yong Choi31IPKM, 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 Hc = 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.
Sandilands et al., PRL 114, 147201 (2014)
Wang et al., PRL 119, 227202 (2017)
Wolter et al., PRB 96, 041405(R) (2017)
Glamazda et al., PRB 95, 174429 (2017)
Glamazda et al., Nat. Commun. 7, 12286 (2016)

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