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We studied the zero-field dynamic nuclear spin polarization in a singleIn$_{0.75}$Al$_{0.25}$As/Al$_{0.3}$Ga$_{0.7}$As quantum dot. Even without anyexternal magnetic field, the positive trion excited by the circularly-polarizedlight generated an Overhauser field of up to $\sim$0.8 T. From the excitationpower dependences of the Overhauser field and degree of circular polarizationof the photoluminescence spectra, the relation between the Overhauser field andKnight field under zero external magnetic field was revealed clearly. Inaddition, we found that the nuclear depolarization rate decreased as themagnitude of the longitudinal magnetic field increased, which seemed to becaused by the influence of the quadrupolar interaction of nuclear spins.Further, the key parameters describing the dynamics of a coupledelectron-nuclear spin system, the electron g-factor and the fluctuation of theOverhauser field, were evaluated in a typical single InAlAs quantum dot.

Dynamic nuclear spin polarization in self-assembled quantum dots under zero magnetic field