Spatiotemporal Spin Noise Spectroscopy

Steeve Cronenberger (1, 2) , Chahine Abbas (1, 2) , Denis Scalbert (1, 2) , H. Boukari (3)

1 L2C - Laboratoire Charles Coulomb
2 OECS - Optique des états collectifs et du spin
3 NEEL - NPSC - Nanophysique et Semiconducteurs

We report on the potential of a new spin noise spectroscopy approach by demonstrating all-optical probing of spatiotemporal spin fluctuations. This is achieved by homodyne mixing of a spatially phase-modulated local oscillator with spin-flip scattered light, from which the frequency and wave vector dependence of the spin noise power is unveiled. As a first application of the method we measure the spatiotemporal spin noise in weakly n-doped CdTe layers, from which the electron spin diffusion constant and spin relaxation rates are determined. The absence of spatial spin correlations is also shown for this particular system.

Domaines: Autre [cond-mat.other]

Steeve Cronenberger, Chahine Abbas, Denis Scalbert, H. Boukari. Spatiotemporal Spin Noise Spectroscopy. Physical Review Letters, 2019, 123 (1), pp.017401. ⟨10.1103/PhysRevLett.123.017401⟩. ⟨hal-02192421⟩