Atomic-scale observation of structural and electronic orders in the layered compound α-RuCl<sub>3</sub>.

Ziatdinov, M; Banerjee, A; Maksov, A; Berlijn, T; Zhou, W; Cao, H B; Yan, J-Q; Bridges, C A et al. · Nat Commun · 2016

basic_science · Level V

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Abstract

A pseudospin-1/2 Mott phase on a honeycomb lattice is proposed to host the celebrated two-dimensional Kitaev model which has an elusive quantum spin liquid ground state, and fascinating physics relevant to the development of future templates towards topological quantum bits. Here we report a comprehensive, atomically resolved real-space study by scanning transmission electron and scanning tunnelling microscopies on a novel layered material displaying Kitaev physics, α-RuCl<sub>3</sub>. Our local crystallography analysis reveals considerable variations in the geometry of the ligand sublattice in thin films of α-RuCl<sub>3</sub> that opens a way to realization of a spatially inhomogeneous magnetic ground state at the nanometre length scale. Using scanning tunnelling techniques, we observe the electronic energy gap of ≈0.25 eV and intra-unit cell symmetry breaking of charge distribution in individual α-RuCl<sub>3</sub> surface layer. The corresponding charge-ordered pattern has a fine structure associated with two different types of charge disproportionation at Cl-terminated surface.