ODMR-Based Resonant Spin Inertia: A Sensitive Technique for Studying Spin Relaxation

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Original abstract

Abstract We describe the principle and applications of the resonant spin inertia technique that is based on optically detected magnetic resonance. It combines optical pumping and Faraday/Kerr rotation probing in a single laser beam and measures spin resonance and the spin inertia effect induced by a modulated radiofrequency field. This method is sensitive, technically simple, and applicable to a wide range of material systems. It provides access to the basic spin properties, including the longitudinal spin relaxation time $$T_1$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>T</mml:mi> <mml:mn>1</mml:mn> </mml:msub> </mml:math> , which can be measured selectively for different spin resonances present in the system. We demonstrate the application of the technique to rare-earth Ce $$^{3+}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mrow/> <mml:mrow/> <mml:mrow> <mml:mn>3</mml:mn> <mml:mo>+</mml:mo> </mml:mrow> </mml:mmultiscripts> </mml:math> ions in a YAG matrix, (In,Ga)As/GaAs quantum dots, and lead halide perovskite nanocrystals. The technique allowed to measure $$T_1$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>T</mml:mi> <mml:mn>1</mml:mn> </mml:msub> </mml:math> in these systems, ranging from microseconds to milliseconds, and to reveal peculiarities of spin relaxation for charge carriers as well as for spatially indirect excitons.

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