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Observation of coherent quench dynamics in a metallic many-body state of fermionic atoms

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  • Sebastian Will

    (Massachusetts Institute of Technology
    Institut für Physik, Johannes Gutenberg-Universität)

  • Deepak Iyer

    (The Pennsylvania State University)

  • Marcos Rigol

    (The Pennsylvania State University)

Abstract

Quantum simulation with ultracold atoms has become a powerful technique to gain insight into interacting many-body systems. In particular, the possibility to study nonequilibrium dynamics offers a unique pathway to understand correlations and excitations in strongly interacting quantum matter. So far, coherent nonequilibrium dynamics has exclusively been observed in ultracold many-body systems of bosonic atoms. Here we report on the observation of coherent quench dynamics of fermionic atoms. A metallic state of ultracold spin-polarized fermions is prepared along with a Bose–Einstein condensate in a shallow three-dimensional optical lattice. After a quench that suppresses tunnelling between lattice sites for both the fermions and the bosons, we observe long-lived coherent oscillations in the fermionic momentum distribution, with a period that is determined solely by the Fermi–Bose interaction energy. Our results show that coherent quench dynamics can serve as a sensitive probe for correlations in delocalized fermionic quantum states and for quantum metrology.

Suggested Citation

  • Sebastian Will & Deepak Iyer & Marcos Rigol, 2015. "Observation of coherent quench dynamics in a metallic many-body state of fermionic atoms," Nature Communications, Nature, vol. 6(1), pages 1-7, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7009
    DOI: 10.1038/ncomms7009
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