title: Scanning tunneling spectroscopy study of the Dirac spectrum of germanene.
abstract: The temperature dependence of the density of states of germanene, synthesized on Ge/Pt crystals, has been investigated with scanning tunneling spectroscopy. After correction for thermal broadening, a virtually perfect V-shaped density of states, which is a hallmark of a two-dimensional Dirac system, has been found. In an attempt to directly measure the energy dispersion relation via quasiparticle interference we have recorded spatial maps of the differential conductivity near the edges and defects of germanene. Unfortunately, we did not find any sign of Friedel oscillations. The absence of these Friedel oscillations hints to the occurrence of Klein tunneling.
authors.affiliation: Physics of Interfaces and Nanomaterials, MESA+  Institute for Nanotechnology, University of Twente, PO Box 217, 7500AE, Enschede, The Netherlands.
authors.forename: C J
authors.initials: CJ
authors.lastname: Walhout
authors.forename: A
authors.initials: A
authors.lastname: Acun
authors.forename: L
authors.initials: L
authors.lastname: Zhang
authors.forename: M
authors.initials: M
authors.lastname: Ezawa
authors.forename: H J W
authors.initials: HJ
authors.lastname: Zandvliet