Challenges in design of Kitaev materials: Magnetic interactions from competing energy scales
TLDR
In this paper, the authors re-evaluate the magnetic interactions in three spin liquid candidate materials, using nonperturbative exact diagonalization methods, and help estimate the potential for realizing the spin liquid state in real materials.Abstract:
Much interest has emerged in the realization of materials with quantum spin liquid ground states, which would provide fertile ground for realizing exotic excitations. Three ``Kitaev'' spin liquid candidate materials have been proposed -- Na${}_{2}$IrO${}_{3}$, $\ensuremath{\alpha}$-RuCl${}_{3}$, and $\ensuremath{\alpha}$-Li${}_{2}$IrO${}_{3}$ -- and there has been many diverging proposals for the most relevant interactions. Here, the authors re-evaluate carefully the magnetic interactions in these materials, using nonperturbative exact diagonalization methods. The results clarify misconceptions in the literature and help estimate the potential for realizing the spin liquid state in real materials.read more
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Journal ArticleDOI
Concept and realization of Kitaev quantum spin liquids
Hidenori Takagi,Hidenori Takagi,Hidenori Takagi,T. Takayama,T. Takayama,George Jackeli,George Jackeli,Giniyat Khaliullin,Stephen E. Nagler +8 more
TL;DR: The Kitaev model is an exactly solvable S = 1/2 spin model on a 2D honeycomb lattice, in which the spins fractionalize into Majorana fermions and form a topological quantum spin liquid in the ground state as mentioned in this paper.
Journal ArticleDOI
Neutron scattering in the proximate quantum spin liquid α-RuCl 3 .
Arnab Banerjee,Jiaqiang Yan,Johannes Knolle,Craig A. Bridges,Matthew B. Stone,Mark D Lumsden,David Mandrus,David Mandrus,David Tennant,Roderich Moessner,Stephen E. Nagler +10 more
TL;DR: In this article, the authors used neutron scattering on single crystals of α-RuCl3 to reconstruct dynamical correlations in energy-momentum space and discovered highly unusual signals, including a column of scattering over a large energy interval around the Brillouin zone center.
Journal ArticleDOI
Models and materials for generalized Kitaev magnetism.
Stephen M. Winter,Alexander A. Tsirlin,Maria Daghofer,Jeroen van den Brink,Yogesh Singh,Philipp Gegenwart,Roser Valentí +6 more
TL;DR: The mechanism proposed by Jackeli and Khaliullin to identify Kitaev materials based on spin-orbital dependent bond interactions is analyzed and a comprehensive overview of its implications in real materials is provided.
Journal ArticleDOI
Neutron tomography of magnetic Majorana fermions in a proximate quantum spin liquid
Arnab Banerjee,Jiaqiang Yan,Roderich Moessner,David Tennant,Matthew B. Stone,Stephen E. Nagler,Craig A. Bridges,David Mandrus,Mark D Lumsden,Johannes Knolle +9 more
TL;DR: A comprehensive inelastic neutron scattering study of single crystals of the material α-RuCl3, which has been predicted to a host a Kitaev spin liquid, finds highly unusual signals, including a column of scattering over a large energy interval around the Brillouin zone center, which is consistent with scattering from the Majorana excitations of a KQSL.
Journal ArticleDOI
Majorana quantization and half-integer thermal quantum Hall effect in a Kitaev spin liquid
Yuichi Kasahara,Teruaki Ohnishi,Yuta Mizukami,O. Tanaka,Sixiao Ma,Kaori Sugii,Nobuyuki Kurita,Hidekazu Tanaka,Joji Nasu,Yukitoshi Motome,Takasada Shibauchi,Yuji Matsuda +11 more
TL;DR: Half-integer quantization of the thermal Hall effect in a Kitaev spin liquid reveals chiral currents of charge-neutral Majorana fermions around the edges of the sample, produced by strong electronic correlations.
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