Direct Evidence of Dirac Signature in Bilayer Germanene Islands on Cu(111).

Qin, Zhihui; Pan, Jinbo; Lu, Shuangzan; Shao, Yan; Wang, Yeliang; Du, Shixuan; Gao, Hong-Jun; Cao, Gengyu · Adv Mater · 2017

basic_science · Level V

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Abstract

Bernal-stacked bilayer germanene with a stable buckled honeycomb structure has been successfully synthesized on Cu(111). Structural and electronic characterizations as well as theoretical calculations unequivocally demonstrate for the first time the presence of a nearly linear energy dispersion in the vicinity of the Fermi energy, as expected of the Dirac signature for theoretical freestanding germanene.