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Hexagonal LuFeO3 is a multiferroic showing ferroelectricity and antiferromagnetism at room temperature. Below TR=130 K, it becomes ferrimagnetic. Ultrafast optical pump-probe measurements reveal that the dynamics are correlated with the structural changes responsible for ferrimagnetism.
Visible pump-probe spectroscopy isolates the femtosecond Drude response of a photogenerated electron-hole plasma in monolayer graphene. The observed Vn scaling versus carrier density reveals the relativistic nature of the electron-hole plasma.
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