We report on experiments performed with an all-optical spinor BEC, including gravity-aided evaporation, a novel atom laser and a measurement of the density dependence of the spinor dynamics.

Conference on Lasers and Electro-OpticsJan 1, 20060 citations

Bulletin of the American Physical Society

Dynamics of a spinor atom-SQUID

Ranchu Mathew, Eite Tiesinga

Published Jun 9, 2015• 0 citations

OpenAlex

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We demonstrate a precise magnetic microscope based on direct imaging of the Larmor precession of a

^{87}\mathrm{Rb}

spinor Bose-Einstein condensate. This magnetometer attains a field sensitivity of

8.3\text{ }\text{ }\mathrm{pT}/{\mathrm{Hz}}^{1/2}

over a measurement area of $120\text{ }\text{ }\ensuremath{\mu}{\mathrm{m}}^{2}$, an improvement over the low-frequency field sensitivity of modern SQUID magnetometers. The achieved phase sensitivity is close to the atom shot-noise limit, estimated as

0.15\text{ }\text{ }\mathrm{pT}/{\mathrm{Hz}}^{1/2}

for a unity duty cycle measurement, suggesting the possibilities of spatially resolved spin-squeezed magnetometry. This magnetometer marks a significant application of degenerate atomic gases to metrology.

The spinor dynamics of Bose-Einstein condensates of

^{87}\mathrm{Rb}

atoms with hyperfine spins of 1 and 2 are investigated. A mixture of spinor condensates is generated in the transversely polarized spin-1 and the longitudinally polarized spin-2 states using simultaneous Ramsey interferometry. In the subsequent dynamics, temporal modulation of spin-1 magnetization is observed in the spinor mixture due to the spin-dependent interaction with the spin-2 component. By comparison with numerical simulations based on the Gross-Pitaevskii equation, we find that the observed nonferromagnetic dynamics reflect the ground-state properties of the spinor mixture.