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After the discovery of Dirac fermions in graphene, it has become a naturalquestion to ask whether it is possible to realize Dirac fermions in othertwo-dimensional (2D) materials as well. In this work, we report the discoveryof multiple Dirac-like electronic bands in ultrathin Ge films grown on Au(111)by angle-resolved photoelectron spectroscopy. By tuning the thickness of thefilms, we are able to observe the evolution of their electronic structure whenpassing through the monolayer limit. Our discovery may signify the synthesis ofgermanene, a 2D honeycomb structure made of Ge, which is a promising platformfor exploring exotic topological phenomena and enabling potential applications.

Emergence of Dirac-like bands in the monolayer limit of epitaxial Ge films on Au(111)