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Nonparabolic subband structure of In0.53Ga0.47As/In0.52Al0.48As multi-quantum wells was studied theoretically and experimentally. In periodic potential of the multi-quantum-well structure, if barrier layers are thin, electron eigen-states become minibands having with energy width. In 10 nm width barrier, the energy width becomes wider at higher energy. When the eigen-state is more than 0.5 eV and...
We measured the transient absorption changes of a near-infrared (NIR) pulse in GaAs quantum well under a multicycle THz wave driving. By changing the delay between the NIR probe and the THz wave, the absorption strength can be modulated on a sub-cycle timescale of THz wave, indicating the formation of THz-induced dressed states of excitons.
Photocurrent spectroscopy in lattice matched In0:53Ga0:47As/In0:52Al0:48As multi-quantum wells structures were measured at room temperatures. Step-like structures accentuated by the exciton peaks of interband transitions were observed on photocurrent spectra. The exciton peaks clearly appeared at lower quantum numbers and do not appear at higher quantum number. It might be caused that the electron...
The nonlinear interactions of GaAs quantum wells with intense single cycle terahertz (THz) pulses with amplitudes exceeding 1 MV/cm have been studied. We demonstrated for the first time that the number of carriers is enhanced 103 times more with an increase of the electric field amplitude of the THz pulse from 0.5 to 1 MV/cm, eventually which leading a bright near-infrared luminescence. This highly...
Recent development of ultrashort pulse technologies allows us to drive large amplitude motion of electron and ion coherently. The intense terahertz (THz) pulse resonant with the vibration frequency is promising to drive vibrations more directly and in coherent manner. In the case of semiconductors, one may coherently control the electronic system in the sub-level structures of quantum structures with...
The excitonic interaction in ZnSe/ZnMgSSe multiple quantum wells with intense terahertz pulses (~70 kV/cm) has been studied. Our results show a dynamical Stark effect on the excitonic absorption with a subpicosecond response time.
In a In0.53Ga0.47As/In0.52Al0.48As multi-quantum wells structure, interband transitions were clearly observed in a photocurrent difference spectrum. Using an assumption that the energy dependence of electron effective mass varied smoothly toward higher energy, its nonparabolicity was explicitly determined from 0.041 m0 to 0.07 m0 in conduction quantum well.
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