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Terahertz (THz) spectral band, from about 0.1 to 15 THz, is one of the least explored yet most technologically transformative spectral regions. A large number of interesting scientific phenomena are only accessible by THz photons and THz radiation also finds a lot of practical applications. However, for a long time, THz scientific research and technological development is greatly limited due to the...
We observe a critical speeding up in the electronic relaxation time that implies that nematic fluctuations govern the electronic thermalization/cooling dynamics and that magnetic fluctuations dominate the nonlinear signals that arise from the Ising-nematicity.
We observe a distinct excitation-fluence-dependent transient carrier relaxation in a strongly correlated colossal magnetoresistive manganite that correlates with photoinduced magnetic and electronic phase transitions characterized by nonlinear photoexcitation behaviors.
Femtosecond-resolved polarimetry characterizes a two-step polarization recovery after non-equilibrium photoexcitation of BaFe2As2. This underpins the nematicity as an independent degree of freedom responsible for the anisotropy, which demonstrates a benchmark approach to anisotropic quantum fluids.
We report a pump threshold behavior of fs photoinduced magnetization enhancement in a antiferromagnetic manganite, which shows the establishment of thermally-inaccessible, hidden ferromagnetic ground state and build-up of new magnetic order parameters within 180 fs.
Using optical-pump THz-probe spectroscopy, we observe a non-monotonic variation in the electric dipole oscillator strength as function of excitation fluence, revealing particularly, a partial recovery of the oscillator in highly-excited metamaterials for the first time.
We report for the first time photoinduced femtosecond hole spin dynamics and critical behaviors in a ferromagnetic semiconductor, revealing, in particular, a critical slowing down of hole spin relaxation near ferro- to paramagnetic phase transition.
We report ultrafast mid-infrared studies of individualized semiconducting carbon nanotubes. Transient spectra of (6,5) and (7,5) nanotubes evidence photoinduced absorption around 200 meV, associated with intra-excitonic transitions that reflect quasi-1D exciton correlations and dynamics.
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