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                          <header>
                              <identifier>oai:research.chalmers.se:201621</identifier>
                              <datestamp>2018-01-25T20:07:00Z</datestamp>
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                          <metadata>
                              <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
                                  <dc:title>Scattering of flexural acoustic phonons at grain boundaries in graphene</dc:title>
                                  <dc:identifier>https://research.chalmers.se/en/publication/201621</dc:identifier>
                                  <dc:date>2014</dc:date>
                                              <dc:creator>Ahlberg Helgee, Edit</dc:creator>
                                              <dc:creator>Isacsson, Andreas</dc:creator>
                                                  <dc:subject>Physical Sciences</dc:subject>
                                          <dc:description>We investigate the scattering of long-wavelength flexural phonons against grain boundaries in graphene using molecular dynamics simulations. Three symmetric tilt grain boundaries are considered: one with a misorientation angle of 17.9 degrees displaying an out-of-plane buckling 1.5 nm high and 5 nm wide, one with a misorientation angle of 9.4 degrees and an out-of-plane buckling 0.6 nm high and 1.7 nm wide, and one with a misorientation angle of 32.2 degrees and no out-of-plane buckling. At the flat grain boundary, the phonon transmission exceeds 95% for wavelengths above 1 nm. The buckled boundaries have a substantially lower transmission in this wavelength range, with a minimum transmission of 20% for the 17.9 degrees boundary and 40% for the 9.4 degrees boundary. At the buckled boundaries, coupling between flexural and longitudinal phonon modes is also observed. The results indicate that scattering of long-wavelength flexural phonons at grain boundaries in graphene is mainly due to out-of-plane buckling. A continuum mechanical model of the scattering process has been developed, providing a deeper understanding of the scattering process as well as a way to calculate the effect of a grain boundary on long-wavelength flexural phonons based on the buckling size.</dc:description>
                                                                  <dc:relation>info:eu-repo/grantAgreement/EC/FP7/604391//Graphene-Based Revolutions in ICT And Beyond (Graphene Flagship)/</dc:relation>
                                                  <dc:relation>info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.90.045416</dc:relation>
                                          <dc:type>info:eu-repo/semantics/article</dc:type>
                                          <dc:source>Physical Review B - Condensed Matter and Materials Physics (1098-0121) vol.90(2014)</dc:source>
                                                      <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:language>eng</dc:language>
                                  <dc:audience>Researchers</dc:audience>
                                  <dc:format>application/pdf</dc:format>
                              </oai_dc:dc>
                          </metadata>
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