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                           Moduli Spaces and Topology





 Thursday, 12. June 2014

Audio-only-Recording as MP3-File (smallest possible size):

       -   Audio.mp3   (ca.25Mb)


Video-Recording for any system with MP4-support:

       -   Video.mp4   (ca.218Mb)


 15:15 – 16:20


Abstract :

Multilayer graphenes feature special functionalities that microscopically arise from the atomic registry when graphene sheets

are stacked. These depend on relative lateral translations, rotations and layer symmetry breaking that can occur spontaneously

or be induced. This talk will focus on bilayer graphenes (BLG) in which the stacking arrangement varies in space.

We examine domain walls where the local stacking order switches from local AB to BA registry, and study the electronic modes

at the boundary by analyzing their valley-projected four band continuum models augmented by numerical calculations on a lattice.

We then consider the more general family of two dimensional strain-minimizing BLG stacking textures, showing that they are

twisted textures of the interlayer displacement field. We study the interactions and composition rules for these elementary textures

which permit a unified treatment of stacking point defects, domain walls and twisted graphenes.



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