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In mesoscopic systems with spin-orbit coupling, spin-injection into quantumdots at zero magnetic field is expected under a wide range of conditions.However, up to now, a viable approach for experimentally identifying suchinjection has been lacking. We show that electron spin injection into aspin-blockaded double quantum dot is dramatically manifested in the breaking ofmagnetic- field-inversion symmetry of nuclear polarization instabilities. Overa wide range of parameters, the asymmetry between positive and negativeinstability fields is extremely sensitive to the injected electron spinpolarization and allows for the detection of even very weak spin injection.This phenomenon may be used to investigate the mechanisms of spin transport,and may hold implications for spin-based information processing.

Detection of spin injection into a double quantum dot: Violation of magnetic-field-inversion symmetry of nuclear polarization instabilities