Angle-resolved Photoemission Spectroscopy Study on the Surface States of the Correlated Topological Insulator YbB6

Abstract

We report the electronic structure of YbB6, a recently predicted moderately correlated topological insulator, measured by angle-resolved photoemission spectroscopy. We directly observed linearly dispersive bands around the time-reversal invariant momenta Γ and X with negligible kz dependence, consistent with odd number of surface states crossing the Fermi level in a Z2 topological insulator. Circular dichroism photoemission spectra suggest that these in-gap states possess chirality of orbital angular momentum, which is related to the chiral spin texture, further indicative of their topological nature. The observed insulating gap of YbB6 is about 100 meV, larger than that reported by theoretical calculations. Our results present strong evidence that YbB6 is a correlated topological insulator and provide a foundation for further studies of this promising material.

arXiv comment5 pages, 4 figures

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Cited by in corpus (17)

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• Surface Theory of a Family of Topological Kondo Insulators
• Fermi Surface Topology and Hotspots Distribution in Kondo Lattice System CeB6
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• Pressure-induced quantum phase transitions in topological insulator YbB6
• Hybridization gap formation in the Kondo insulator YbB${}_{12}$ observed using time-resolved photoemission spectroscopy
• Two distinct topological phases in the mixed valence compound YbB6 and its differences from SmB6
• Excitonic and Nematic Instabilities on the Surface of Topological Kondo Insulators
• Comparative study of rare earth hexaborides using high resolution angle-resolved photoemission
• ARPES insights on the metallic states of YbB6(001): E(k) dispersion, temporal changes and spatial variation
• Interacting weak topological insulators and their transition to Dirac semimetal phases
• Topological Charge/spin density Wave in InAs/GaSb Quantum Wells under an In-plane Magnetic Field
• Pressure-Driven Topological Phase Transition in the Yb Chalcogenides YbO and YbS
• Interacting topological phases in thin films of topological mirror Kondo insulators
• Spontaneous symmetry breaking and quantum Hall valley ordering on the surface of topological hexaborides
• Exploring itinerant states in divalent hexaborides using rare-earth $L$ edge resonant inelastic X-ray scattering
• Nanoscale Conducting and Insulating Domains on YbB${}_6$