Femtosecond coherent spectroscopy of four-wave mixing and photon echoes in a GaAs/AlGaAs heterostructure at room temperature |
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Authors: | K V Ivanin A V Leont’ev V S Lobkov G M Safiullin V V Samartsev |
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Institution: | 1.Zavoiskii Physicotechnical Institute, Kazan Scientific Center,Russian Academy of Sciences,Kazan, Tatarstan,Russia;2.Kazan Federal University,Kazan,Russia |
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Abstract: | The results from experiments employing coherent femtosecond spectroscopy in a layer of two-dimensional electron gas at the
boundary of the GaAs/AlGaAs heterojunction at room temperature are presented. The decay curves of primary femtosecond photon
echo are obtained. The decoherence time in two-dimensional electron gas depends strongly on the power of the exciting pulse
and varies from 36 to 54 fs. The dephasing time is studied for the first time as a function of the power of exciting pulses
at room temperature. It is established that this dependence obeys the law T
2 ∼ N
−0.22, which differs from the typical law T
2 ∼ N
−1 for unscreened electron-electron interaction in semiconductor crystals. Analysis shows that electron-phonon interaction plays
an important part along with electron-electron interaction. The induced spin gratings in the GaAs/AlGaAs heterostructure are
studied with an eye to their possible application in spintronics. |
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Keywords: | |
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