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We have investigated the coherent exciton in the diluted magnetic semiconductor quantum wells by means of the degenerate-four-wave-mixing (DFWM) with 200 fs time resolution under magnetic field up to 5 T. We observed the magnetically tunable teraherz oscillation in the time evolution of the DFWM signal. We attributed the oscillation to the spin beat between Zeeman split exciton states, which are...
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