Spin noise of electrons and holes in self-assembled quantum dots

Details Spin noise of electrons and holes in self-assembled quantum dots Spin noise of electrons and holes in self-assembled quantum dots

2009-09-08

arxiv.org/abs/0909.1592v1

Physical Review Letters 104, 036601 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 figures

Scientific paper

10.1103/PhysRevLett.104.036601

We measure the frequency spectra of random spin fluctuations, or "spin noise", in ensembles of (In,Ga)As/GaAs quantum dots (QDs) at low temperatures. We employ a spin noise spectrometer based on a sensitive optical Faraday rotation magnetometer that is coupled to a digitizer and field-programmable gate array, to measure and average noise spectra from 0-1 GHz continuously in real time with sub-nanoradian/root-Hz sensitivity. Both electron and hole spin fluctuations generate distinct noise peaks, whose shift and broadening with magnetic field directly reveal their g-factors and dephasing rates within the ensemble. A large, energy-dependent anisotropy of the in-plane hole g-factor is clearly exposed, reflecting systematic variations in the average QD confinement potential.

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