Ramin Dahbashi, Jens Hübner, Fabian Berski, Klaus Pierz, Michael Oestreich
We advance spin noise spectroscopy to the ultimate limit of single spin detection. The non-demolition technique enables the measurement of the spin dynamics of a single heavy hole localized in a flat (InGa)As quantum dot. Magnetic field and light intensity dependent studies reveal even at low magnetic fields a strong magnetic field dependence of B_z^(-3/2) of the longitudinal heavy hole spin relaxation rate and an extremely long T_1 of > 180 microseconds at 31 mT and 5 K. The wavelength dependence of the spin noise power discloses for finite light intensities an inhomogeneous single quantum dot spin noise spectrum which is explained by charge fluctuations in the direct neighborhood of the quantum dot. The charge fluctuations are corroborated by the distinct intensity dependence of the full width at half maximum of the spin noise spectrum.
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http://arxiv.org/abs/1306.3183
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