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“Studying
topological materials using Terahertz radiation “
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Date: |
Download-files: |
Time: |
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Monday, 26. Oct. 2015 |
Audio-only-Recording as MP3-File
(smallest possible size):
- Audio.mp3 (ca.20 Mb) ============================================ Video-Recording for any system with MP4-support:
- Video.mp4 (ca.216 Mb) |
10:00 – 10:45 |
Abstract :
Topological
insulators are an emerging class of quantum materials. These materials show
experimental properties
similar
to graphene, e.g. a low-energy electronic structure
with Dirac fermion excitations, but in contrast to
grapheme
with
strong spin-orbit coupling. As a consequence topological (crystalline)
insulators exhibit an inverted insulating
bulk band
structure and conducting (gapless), symmetry-protected surface states with
helical spin texture.
The subject
matter of this talk is how Terahertz radiation can be used to study topological
materials, such as e.g.
topological
(crystalline) insulators. In this context Terahertz radiation can be an
interesting probe because
characteristic energies of many elementary solid-state excitations are located in the
Terahertz region
(0.24-24 THz, 1-100 meV) of the
electromagnetic spectrum.