Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 28, Issue 28, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/28/28/284006
Keywords
germanene; Dirac; STM; STS; thermal broadening; LDOS; Friedel
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Funding
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) [022.003.001]
- China Scholarship Council (CSC) [201306890010]
- JSPS KAKENHI [25400317, 15H05854]
- stichting voor Fundamenteel Onderzoek der Materie (FOM) [FP157, 14TWOD07]
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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.
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