Nonlinear optical response and exciton dephasing in quantum dots
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cond-mat.mes-hall
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dotsexcitonquantumdephasingdifferentstatesaccountacoustic
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The full time-dependent four-wave mixing polarization in quantum dots is microscopically calculated, taking into account acoustic phonon-assisted transitions between different exciton states of the dot. It is shown that quite different dephasing times of higher exciton states in pancake anisotropic InGaAs quantum dots are responsible for the experimentally observed [1] double-exponential decay in the photon echo signal.
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