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“Ultrafast high THz-field photo-driven carrier dynamics and transport in nanostructures “

Date:

Download-files:

Time:

Thursday, 20. March. 2014

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

- Audio.mp3 (ca.28Mb)

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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.