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Title: Configuration of ripple domains and their topological defects formed under local mechanical stress on hexagonal monolayer graphene

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep09390· OSTI ID:1193715
 [1];  [2];  [3];  [1];  [4];  [1];  [1];  [1]
  1. Konkuk Univ., Seoul (Korea)
  2. Electronics and Telecommunications Research Institute, Daejeon (Korea)
  3. Sejong Univ., Seoul (Korea, Republic of)
  4. 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
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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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

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