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This paper develops a methodology for the analysis of asymmetric AC systems using complex vectors. This methodology is based on the well-known symmetrical components modeling that is regularly applied to the steady-state analysis of asymmetric systems. It is shown that this steady-state methodology is a subset of a more general framework that has applicability to transient analysis. From the derived...
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...
Intense terahertz transients coherently control magnon oscillations in antiferromagnetic NiO. The magnetic component of the light field directly couples to the spins via Zeeman interaction. 8-fs probe pulses sample the ultrafast dynamics via Faraday rotation.
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.
We report on two investigations demonstrating that terahertz spectroscopy is a powerful tool to study the orbital and spin dynamics of electrons in magnetically ordered solids. First, we show that the terahertz pulse emitted from a photo-excited ferromagnetic Fe film is highly sensitive to the motion of spin-polarized electrons along the film interfaces. Second, the magnetic field of an intense terahertz...
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...
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