The range of non-Kitaev terms and fractional particles in α-RuCl3

Yiping Wang, Gavin B. Osterhoudt, Yao Tian, Paige Lampen-Kelley, Arnab Banerjee, Thomas Goldstein, Jun Yan, Johannes Knolle, Huiwen Ji, Robert J. Cava, Joji Nasu, Yukitoshi Motome, Stephen E. Nagler, David Mandrus, Kenneth S. Burch

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Significant efforts have focused on the magnetic excitations of relativistic Mott insulators, predicted to realize the Kitaev quantum spin liquid (QSL). This exactly solvable model involves a highly entangled state resulting from bond-dependent Ising interactions that produce excitations which are non-local in terms of spin flips. A key challenge in real materials is identifying the relative size of the non-Kitaev terms and their role in the emergence or suppression of fractional excitations. Here, we identify the energy and temperature boundaries of non-Kitaev interactions by direct comparison of the Raman susceptibility of α-RuCl3 with quantum Monte Carlo (QMC) results for the Kitaev QSL. Moreover, we further confirm the fractional nature of the magnetic excitations, which is given by creating a pair of fermionic quasiparticles. Interestingly, this fermionic response remains valid in the non-Kitaev range. Our results and focus on the use of the Raman susceptibility provide a stringent new test for future theoretical and experimental studies of QSLs.

Original languageEnglish (US)
Article number14
Journalnpj Quantum Materials
Volume5
Issue number1
DOIs
StatePublished - Dec 1 2020

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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