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Kohn's theorem excludes nonlinear light-matter interaction for Landau-quantized electrons. Intense THz and two-dimensional field-resolved spectroscopy however reveal population inversion and multi-wave mixing, which we explain through Coulomb interactions between electrons and the ionic background.
Controlling superpositions of electronic quantum states through nonlinear interactions is central to quantum computing. At THz frequencies, solid-state systems exhibit numerous elementary excitations suitable to this purpose, yet efficient dephasing mechanisms render their exploitation challenging. The cyclotron resonance, protected from Coulomb interactions by Kohn's theorem, is a unique exception...
Phase-locked few-cycle pulses in the ultrabroadband terahertz (THz) spectral window1–4 have become a powerful tool to access low-energy elementary dynamics in solids, on time scales shorter than a single oscillation cycle of light5–14. Here, we tackle the role of excitons and their dynamics in modern dichalcogenide monolayers and exciton-polariton condensates7–9. Furthermore, intense THz pulses are...
Local terahertz fields of multiple 10 MV/cm tailored in gold metamaterials drive electronic interband transitions in intrinsic GaAs. The bandgap exceeds the THz photon energy 400-fold. Photoluminescence microscopy maps the THz near-field distribution.
The purpose of this study was to assess the ability of cytology to predict the results of colposcopically directed cervical biopsies in HIV-infected women. We performed a case-control study of 52 HIV(+), 31% of whom had AIDS, and 57 HIV(-) women referred to two tertiary care centers for colposcopy from July 1991 to November 1993. All 57 HIV(-) controls and 27 HIV (+) cases underwent colposcopy for...
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