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“Ultrafast high THz-field
photo-driven carrier dynamics and transport in nanostructures “
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Date: |
Download-files: |
Time: |
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Thursday, 20. March. 2014 |
Audio-only-Recording as MP3-File
(smallest possible size):
- Audio.mp3 (ca.28Mb) ============================================ Video-Recording for any system with MP4-support:
- Video.mp4 (ca.246Mb) |
15:15 – 16:15 |
Abstract:
The
electronics and optoelectronics technology is increasingly dominated by nanometer scale structures.
This trend is
going to continue in the future driven to large extent by the perceived needs
of future computing technology
for
higher speed, smaller footprint and improved efficiency, where logical state
switching should be achieved with
drastically
reduced energy-per-bit cost. This entails operating nanometer
scale solid state structures at high electric field
strengths
and in THz frequency range or on sub-picosecond
time-scale. The material properties and excitations undergo
profound
modifications in such spatio-temporal scales as are
the dynamics of the elementary scattering process and this
has a
strong impact on the charge carrier dynamics and transport in such
nanostructures through the friction they set in at
the very
microscopic quantum level. The talk will summarize the status of research in
this field by outlining the main regimes
of
carrier dynamics and transport on ultra-short temporal scales pertinent for nanostructured semiconductors and
ferroelectrics in terms of simple quantum –kinetic scattering processes and induced
carrier-carrier interactions and briefly
discuss
the issue of the quantum friction in media lacking spatial inversion symmetry.
State of the art experimental studies
employing
optical-THz pump-probe time resolved spectroscopy illustrating pertinent charge
carrier dynamics and transport
in
semiconductor and ferroelectric nanostructures will be presented.