Persistent Self-Induced Larmor Precession Evidenced through Periodic Revivals of Coherence,Physical Review Letters

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Persistent Self-Induced Larmor Precession Evidenced through Periodic Revivals of Coherence
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-10-04 , DOI: 10.1103/physrevlett.129.155301
H Sigurdsson _{1,

2} , I Gnusov ₃ , S Alyatkin ₃ , L Pickup ₂ , N A Gippius ₃ , P G Lagoudakis _{2,

3} , A Askitopoulos _{3,

4}

Affiliation

Interferometric measurements of an optically trapped exciton-polariton condensate reveal a regime where the condensate pseudo-spin precesses persistently within the driving optical pulse. For a single

20 μ s

optical pulse, the condensate pseudo-spin undergoes over

10^{5}

full precessions with striking frequency stability. The emergence of the precession is traced to polariton nonlinear interactions that give rise to a self-induced out-of-plane magnetic field, which in turn drives the system spin dynamics. The Larmor precession frequency and trajectory are directly influenced by the condensate density, enabling the control of this effect with optical means. Our results accentuate the system’s potential for the realization of magnetometry devices and can lead to the emergence of spin-squeezed polariton condensates.

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