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2016•Journal of the American Chemical SocietyRequires access

Evidence for Anionic Excess Electrons in a Quasi-Two-Dimensional Ca2N Electride by Angle-Resolved Photoemission Spectroscopy

Ji Seop Oh, Chang‐Jong Kang, Ye Ji Kim, Soobin Sinn, Moonsup Han, Young Jun Chang, Byeong‐Gyu Park, Sung Wng Kim, Byung Il Min, Hyeong-Do Kim, Tae Won Noh

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Abstract

Angle-resolved photoemission spectroscopy (ARPES) study of a layered electride Ca2N was carried out to reveal its quasi-two-dimensional electronic structure. The band dispersions and the Fermi-surface map are consistent with the density functional theory results except for a chemical potential shift that may originate from the high reactivity of surface excess electrons. Thus, the existence of anionic excess electrons in the interlayer region of Ca2N is strongly supported by ARPES.

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What this paper is about

Angle-resolved photoemission spectroscopy (ARPES) study of a layered electride Ca2N was carried out to reveal its quasi-two-dimensional electronic structure. The band dispersions and the Fermi-surface map are consistent with the density functional theory results except for a chemical potential shift that may originate from the high reactivity of surface excess electrons. Thus, the existence of anionic excess electrons in the interlayer region of Ca2N is strongly supported by ARPES.

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Available abstract

Angle-resolved photoemission spectroscopy (ARPES) study of a layered electride Ca2N was carried out to reveal its quasi-two-dimensional electronic structure. The band dispersions and the Fermi-surface map are consistent with the density functional theory results except for a chemical potential shift that may originate from the high reactivity of surface excess electrons. Thus, the existence of anionic excess electrons in the interlayer region of Ca2N is strongly supported by ARPES.

Key concepts: Angle-resolved photoemission spectroscopy, Chemistry, Photoemission spectroscopy, Electron, Electronic structure, Fermi level, Inverse photoemission spectroscopy, X-ray photoelectron spectroscopy

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