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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.
We directly resolve energy transfer pathways from electrons to magnons in multiferroic HoMnO3 using ultrafast optical/terahertz spectroscopy. This reveals that energy is initially transferred from electrons to phonons and subsequently to magnons through spin-lattice relaxation.
Ultrafast optical pump-probe spectroscopy is used to study a heterostructure consisting of superconducting and antiferromagnetic films. We observed a new slow relaxation process that reveals the interaction between superconducting and antiferromagnetic order at the interface.
Terahertz time-domain spectroscopy and temperature dependent femtosecond optical pump-probe spectroscopy are used to track quasiparticle dynamics at the interface between superconducting and ferromagnetic oxide layers.
We map space-and-time-dependent carrier dynamics in single silicon nanowires firstly, using ultrafast optical microscopy. This enables us to directly measure acoustic phonon oscillations and carrier velocities in Si and Si/SiO2 core-shell nanowires.
We present the first ultrafast time-resolved, polarization-dependent experiments on both single- and ensemble-silicon nanowires using non-degenerate spectroscopy. Anisotropy was observed for polarizations perpendicular and parallel to the nanowire.
Temperature-dependent femtosecond optical spectroscopy is used to track polaron dynamics in the spin and charge frustrated system LuFe2O4, revealing the influence of charge and spin ordering on polaron excitation, redressing, and coupling to on-site excitations.
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.
We report a novel ultrafast optical system capable of directly pumping low energy excitations in complex materials and probing the photoinduced changes in their properties with terahertz pulses, benchmarked through mid-infrared-pump, THz-probe measurements on InSb.
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