Pre-submission Thesis Presentation
Developing a novel, non-invasive detection technique in hot and cold atomic systems based on spin noise spectroscopy (SNS)
Speaker: Maheswar Swar (Raman Research Institute)
Spin is a purely quantum property of the subatomic particles, e.g. electrons. Measurements of atomic spin properties, in particular spin-lifetime (T1) and spin-coherence time (T2), comes under the broad field of “spintronics” with direct applications in metrology.
In this seminar, I shall present the first detection of intrinsic spin-coherence from an ensemble of magneto-optically trapped (MOT) cold atoms at 150 𝜇K temperature using Faraday rotation fluctuations measurement and by employing coherent Raman coupling. A coherent Raman coupling (in Λ-
configuration) applied between the adjacent Zeeman states within the ground hyperfine level enhances the traditional spin noise (SN) signal strength by million folds in thermal atoms that allows us to detect the spin coherence in cold atoms with a good signal-to-noise ratio. I shall also present, an instantaneous measurement of atomic spin polarization when the spin system is subjected to a resonant radiation field. The precise measurement of various atomic, nuclear, magnetic, and chemical properties and demonstration of time-resolved precision magnetometry within the intrinsic SN measurement will also be presented. At the end of the seminar, I shall present our recent activities on spin-exchange and give an outlook on implementation in the ultra-cold quantum mixture experimental setup.