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Article
Open AccessObservation of an electronic order along [110] direction in FeSe
Multiple ordered states have been observed in unconventional superconductors. Here, we apply scanning tunneling microscopy to probe the intrinsic ordered states in FeSe, the structurally simplest iron-based su...
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Article
Open AccessFractionalized excitations in the partially magnetized spin liquid candidate YbMgGaO4
Quantum spin liquids (QSLs) are exotic states of matter characterized by emergent gauge structures and fractionalized elementary excitations. The recently discovered triangular lattice antiferromagnet YbMgGaO4 is...
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Article
Open AccessStructure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors
Heavily electron-doped iron-selenide high-transition-temperature (high-T c) superconductors, which have no hole Fermi pockets, but have a notably high T c, have cha...
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Article
Evidence for a spinon Fermi surface in a triangular-lattice quantum-spin-liquid candidate
A spin excitation continuum across a large region of the Brillouin zone that persists at near-zero temperatures provides evidence for a quantum spin liquid state with a spinon Fermi surface in YbMgGaO4.