Observation of Zitterbewegung in a spin-orbit coupled Bose-Einstein condensateReport as inadecuate



 Observation of Zitterbewegung in a spin-orbit coupled Bose-Einstein condensate


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Spin-orbit coupled ultra-cold atoms provide an intriguing new avenue for the study of rich spin dynamics in superfluids. In this Letter, we observe Zitterbewegung, the simultaneous velocity thus position and spin oscillations, of neutral atoms between two spin-orbit coupled bands in a Bose-Einstein condensate BEC through sudden quantum quenches of the Hamiltonian. The observed Zitterbewegung oscillations are perfect on a short time scale but gradually damp out on a long time scale, followed by sudden and strong heating of the BEC. As an application, we also demonstrate how Zitterbewegung oscillations can be exploited to populate the upper spin-orbit band, and observe a subsequent dipole motion. Our experimental results are corroborated by a theoretical and numerical analysis and showcase the great flexibility that ultra-cold atoms provide for investigating rich spin dynamics in superfluids.



Author: Chunlei Qu; Chris Hamner; Ming Gong; Chuanwei Zhang; Peter Engels

Source: https://archive.org/







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