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The strong-field interaction of crystal electrons with a low-frequency light wave leads to the emission of ultrabroadband high-order harmonics. The underlying dynamics are investigated in the frequency and in the time domain. An intricate quantum interference involving multiple electronic states in the solid is unraveled.
Bosons can populate quantum states macroscopically, forming various kinds of thermal-equilibrium, and quasi-equilibrium condensates [1,2], which exhibit a wide range of collective phenomena including superfluidity and macroscopic coherence in matter. Interferometry has been employed to demonstrate long-range off-diagonal order in cold-atom systems [3], and, recently, in the rapidly developing field...
We use second harmonic generation to observe an ultrafast magnetic phase transition in MnAs near room temperature following excitation by a 300 fs optical pulse; transition times are on the order of 10 ps.
The ultrafast carrier dynamics of Ge/SiGe quantum wells on Si substrate are investigated by pump-probe spectroscopy. Pronounced nonequilibrium effects in the relaxation dynamics and transient gain are observed and analyzed using a microscopic many-body theory.
Ultrafast carrier dynamics of Ge/SiGe quantum wells grown on a Si substrate are investigated using pump-probe spectroscopy. Optical gain and population inversion are obtained on a femtosecond time scale. A microscopic theory supports the results.
Ultrafast carrier relaxation of Ge/SiGe quantum wells grown on a Si substrate are investigated using pump-probe spectroscopy. A nonthermal carrier distribution is observed. The corresponding inter- and intra-valley scattering times are deduced.
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