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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.
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...
Precise characterization techniques for ultrashort optical pulses have become indispensible with the emergence of ever shorter waveforms. Typically the pulse under study is overlapped with an optical gate and analyzed after a nonlinear interaction with the latter. If the duration of the pulse to be characterized is much shorter or longer than available gate sources, streak cameras [1, 2] or electro-optic...
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.
We demonstrate a technique for the characterization of ultrabroadband and low-intensity laser pulses using spectrally resolved THz polarization streaking. Our method yields the spectral amplitude and phase without resorting to complex algorithms.
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