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“Moduli
Spaces and Topology “
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Date: |
Download-files: |
Time: |
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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.