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Strong THz electric and magnetic fields are harnessed to coherently control charge and spin in solids with sub-cycle resolution. Exploiting coherent THz phonons we transiently induce and destroy spin density wave order in pnictides.
Recent studies on ultrafast dynamics of solids and nanostructures using few-cycle electromagnetic transients in the far and mid infrared spectral regions are presented. We are able to excite with phase-locked wave forms reaching peak amplitudes beyond 1 V/Å which are comparable to inner-atomic fields. At the same time, a quantum-limited sensitivity is approached in electro-optic detection. Such capabilities...
Widely tunable phase-locked THz transients with electric and magnetic fields exceeding 100 MV/cm are generated by a novel table-top laser. These pulses are able to drive non-perturbative optical nonlinearities by electric and magnetic coupling.
This paper summarizes the latest advances in THz optoelectronics and exploits this technology for two studies of THz nonlinearities that goes beyond the perturbative regime. In the first study, intense multi-terahertz fields are used to coherently promote optically dark and dense 1s para excitons in the Cu2O semiconductor into the 2p state. By utilizing the ultrabroadband electro-optic sampling, the...
The ultrafast charge-carrier dynamics in single-wall carbon nanotubes (NTs) have been investigated by time-resolved THz spectroscopy. Both the equilibrium and non-equilibrium conductivity data of the NTs in the far-infrared (FIR) spectral range from 1 to 40 THz are dominated by optical transitions across the band gap of tubes with gap energies of ~ 10 meV. A simple model based on an ensemble of two-level...
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