Configuration of ripple domains and their topological defects formed under local mechanical stress on hexagonal monolayer graphene
- Konkuk Univ., Seoul (Korea)
- Electronics and Telecommunications Research Institute, Daejeon (Korea)
- Sejong Univ., Seoul (Korea, Republic of)
- Konkuk Univ., Seoul (Korea); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Ripples in graphene are extensively investigated because they ensure the mechanical stability of two-dimensional graphene and affect its electronic properties. They arise from spontaneous symmetry breaking and are usually manifested in the form of domains with long-range order. It is expected that topological defects accompany a material exhibiting long-range order, whose functionality depends on characteristics of domains and topological defects. However, there remains a lack of understanding regarding ripple domains and their topological defects formed on monolayer graphene. Here we explore configuration of ripple domains and their topological defects in exfoliated monolayer graphenes on SiO₂/Si substrates using transverse shear microscope. We observe three-color domains with three different ripple directions, which meet at a core. Furthermore, the closed domain is surrounded by an even number of cores connected together by domain boundaries, similar to topological vortex and anti-vortex pairs. In addition, we have found that axisymmetric three-color domains can be induced around nanoparticles underneath the graphene. This fascinating configuration of ripple domains may result from the intrinsic hexagonal symmetry of two-dimensional graphene, which is supported by theoretical simulation using molecular dynamics. Our findings are expected to play a key role in understanding of ripple physics in graphene and other two-dimensional materials.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1193715
- Journal Information:
- Scientific Reports, Vol. 5; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Barrier Reduction of Lithium Ion Tunneling through Graphene with Hybrid Defects: First-Principles Calculations
|
journal | January 2018 |
Velocity-dependent friction enhances tribomechanical differences between monolayer and multilayer graphene
|
journal | October 2019 |
Similar Records
Switchable friction enabled by nanoscale self-assembly on graphene
Deconstructing proton transport through atomically thin monolayer CVD graphene membranes