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• W2899041109 abstract "The Kondo insulator ${mathrm{SmB}}_{6}$ has emerged as a primary candidate for exotic quantum phases, due to the predicted formation of strongly correlated, low-velocity topological surface states and corresponding high Fermi-level density of states. However, measurements of the surface-state velocity in ${mathrm{SmB}}_{6}$ differ by orders of magnitude, depending on the experimental technique used. Here we reconcile two techniques, scanning tunneling microscopy (STM) and angle-resolved photoemission spectroscopy (ARPES), by accounting for surface band bending on polar terminations. Using spatially resolved scanning tunneling spectroscopy, we measure a band shift of $ensuremath{sim}20$ meV between full-Sm and half-Sm terminations, in qualitative agreement with our density-functional theory calculations of the surface charge density. Furthermore, we reproduce the apparent high-velocity surface states reported by ARPES by simulating their observed spectral function as an equal-weight average over the two band-shifted domains that we image by STM. Our results highlight the necessity of local measurements to address inhomogeneously terminated surfaces or fabrication techniques to achieve uniform termination for meaningful large-area surface measurements of polar crystals such as ${mathrm{SmB}}_{6}$." @default.
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• W2899041109 date "2020-02-28" @default.
• W2899041109 modified "2023-10-17" @default.
• W2899041109 title "Consistency between ARPES and STM measurements on <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>SmB</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math>" @default.
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• W2899041109 doi "https://doi.org/10.1103/physrevb.101.085142" @default.
• W2899041109 hasPublicationYear "2020" @default.
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