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Two-dimensional (2D) electrides are a new concept material in which anionicelectrons are confined in the interlayer space between positively chargedlayers. We have performed angle-resolved photoemission spectroscopymeasurements on Y$_2$C, which is a possible 2D electride, in order to verifythe formation of 2D electride states in Y$_2$C. We clearly observe theexistence of semimetallic "electride bands" near the Fermi level, as predictedby ${ab}$ ${initio}$ calculations, conclusively demonstrating that Y$_2$C is aquasi-2D electride with electride bands derived from interlayer anionicelectrons.

Semimetallic "Electride Bands" Derived from Interlayer Electrons in Quasi-Two-Dimensional Electride Y$_2$C