Evidence for a spinon Fermi surface in a triangular-lattice quantum-spin-liquid candidate. Highly mobile gapless excitations in a two-dimensional candidate quantum spin liquid. Spin liquid state in an organic Mott insulator with a triangular lattice. Shimizu, Y., Miyagawa, K., Kanoda, K., Maesato, M. From high temperature superconductivity to quantum spin liquid: progress in strong correlation physics. The resonating valence bond state in La 2CuO 4 and superconductivity. Quantum orders and symmetric spin liquids. An end to the drought of quantum spin liquids. Resonating valence bonds: a new kind of insulator? Mater. These super-modulations allow the direct experimental measurement of the spinon Fermi wavevector, in good agreement with theoretical predictions for a two-dimensional quantum spin liquid.Īnderson, P. Spectroscopic imaging of isolated single-layer 1T-TaSe 2 reveals long-wavelength super-modulations at Hubbard band energies, consistent with the predicted behaviour of itinerant spinons. We confirm the existence of a triangular lattice of localized spins in this material by contacting it with a metallic 1H-TaSe 2 substrate and measuring the Kondo effect. Here we use scanning tunnelling spectroscopy to image density waves consistent with the predictions of spinon density modulation arising from a spinon Fermi surface instability in single-layer 1T-TaSe 2. Directly imaging the resulting spinons, however, is difficult due to their chargeless nature. Materials that realize this kind of spin liquid are expected to have a low-energy behaviour described by a spinon Fermi surface. Two-dimensional triangular-lattice antiferromagnets are predicted under some conditions to exhibit a quantum spin liquid ground state with no energy barrier to create emergent, fractionalized spinon excitations that carry spin but no charge. Nature Physics volume 17, pages 1154–1161 ( 2021) Cite this article Evidence for quantum spin liquid behaviour in single-layer 1T-TaSe 2 from scanning tunnelling microscopy
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