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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.
The superconducting state of the high-Tc cuprate Bi2Sr2CaCu2O8+δ is resonantly excited by intense multi-THz pulses and the following quasiparticle dynamics is probed. The dependence of the pump-probe signal on excitation fluence shows a super-linear behavior.
A high-field multi-THz source is used to study the nonlinear response of InSb under off-resonant excitation. Field-resolved four-wave mixing signals demonstrate clear signatures of a non-perturbative regime in agreement with numerical simulations.
Intense THz electric and magnetic fields are exploited to drive extreme nonlinearities in semiconductors, magnetically ordered solids, and molecular systems. Electro-optic sampling allows us to perform field-sensitive two-dimensional spectroscopy, including four- and six-wave mixing in indium antimonide, as well as THz bias — optical probe experiments beyond static dielectric breakdown fields. Finally,...
The influence of strong electric fields on electronic properties of semiconductors is of particular interest both for fundamental science and applications in high speed electronics. Investigations using large quasi-static [1] and THz [2] fields have been performed. However, the accessible field amplitudes have been limited to values typically below 1 MV/cm due to the dielectric breakdown under stationary...
Two-dimensional-spectroscopy with near-infrared (NIR) or mid-infrared pulses has given insight into ultrafast dynamics and spectral correlations in many systems [1]. Terahertz (THz) four-wave-mixing (FWM) has attracted growing interest as a potential way to access important low-energy excitations such as inter- and intra-molecular vibrations or energy gaps in superconductors. However, lead-off experiments...
Strong 4- and 6-wave-mixing is detected electro-optically when two multi-THz fields of 5 MV/cm interact in InSb. These processes are mediated by 2-photon interband transitions. A non-collinear geometry paves the way for background-free measurements.
Phase-locked multi-THz transients bias semiconductors far above the usual threshold for dielectric breakdown. Few-cycle NIR pulses synchronized to the THz transients on an as-timescale, probe interband transitions under electric fields of 4 MV/cm.
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.
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