Two-dimensional germanium islands with Dirac signature on Ag2Ge surface alloy

Abstract

Two-dimensional (2D) Dirac materials have attracted intense research efforts due to their promise for applications ranging from field-effect transistors and low-power electronics to fault-tolerant quantum computation. One key challenge is to fabricate 2D Dirac materials hosting Dirac electrons. Here, monolayer germanene is successfully fabricated on a Ag2Ge surface alloy. Scanning tunneling spectroscopy measurements revealed a linear energy dispersion relation. The latter was supported by density functional theory calculations. These results demonstrate that monolayer germanene can be realistically fabricated on a Ag2Ge surface alloy. The finding opens the door to exploration and study of 2D Dirac material physics and device applications.

References in corpus (9)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Two Dimensional Atomic Crystals
• Germanene: a novel two-dimensional Germanium allotrope akin to Graphene and Silicene
• Structural and electronic properties of germanene on MoS${}_2$
• Germanene termination of Ge${}_2$Pt crystals on Ge(110)
• Two-dimensional Dirac signature of germanene
• Direct growth of germanene at interfaces between van der Waals materials and Ag(111)
• Growth of germanium-silver surface alloys followed by in situ scanning tunneling microscopy: Absence of germanene formation