- Jana Vejpravová: Rugae of the graphene: creation, observation and consequences
- 26. 10. 2016, 14:30
- lecture room F2, first floor Ke Karlovu 5
- more information
Abstract:
The graphene is viewed as the archetype two-dimensional (2D) crystal composed of honeycomb arrangement of sp2 hybridized carbon atoms. However; any 2D lattice is unstable against thermal fluctuations, thus unsupported graphene sheets undergo the so-called rippling spontaneously. In real samples, in addition to the ripples various topographic corrugations can be detected and classified within the general concept of the ruga mechanics. Thanks to the spatially modulated deformation of the chemical bonds as a consequence of the rugae, the Dirac fermions experience complex gauge fields locally. This phenomenon can be exploited in manifold areas of the graphene research from physics of Dirac fermions in extreme magnetic field regimes to functionalization of the graphene with nanometer resolution. Consequently, the control over creation of specific rugae, namely of the wrinkles in graphene is of high demand. In this talk, basic aspects of the ruga mechanics in graphene will be introduced. Then strategies for tailoring the graphene topography and the use of Raman spectroscopy for detection and quantification of the rugae (wrinkles) will be presented. Finally, examples on properties and possible applications of customized rugae states in graphene and other 2D materials will be given.