Atomic-scale Investigation of Interface Between Graphene Monolayer and Ge(110)
Abstract
The interface states at the graphene-dielectric substrate are scientifically and industrially important to control the electronic properties for the graphene-based applications. In this report, we present the atomic and electronic structures of graphene on Ge(110), studied by scanning tunneling microscopy and spectroscopy (STM/STS) in an atomic scale. We observed Ge pentamers and ridge structures. The strong electric coupling at the interface and the existence of the Ge pentamers were confirmed by additional peaks at -0.55 V and -0.20 V in the d I/d V spectra. Based on the analysis of the energy gap mappings near the ridges of graphene, extracted from the two-dimensional STS measurements, we could tell the effects of the graphene strain and the interfacial gap distance on the electronic structures of graphene/Ge(110).
- Publication:
-
Journal of Korean Physical Society
- Pub Date:
- February 2019
- DOI:
- 10.3938/jkps.74.241
- Bibcode:
- 2019JKPS...74..241P
- Keywords:
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- Graphene;
- Germanium;
- Interface states;
- Strain;
- Ge pentamer