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

Sebastian Will (), Deepak Iyer and Marcos Rigol
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Sebastian Will: Massachusetts Institute of Technology
Deepak Iyer: The Pennsylvania State University
Marcos Rigol: The Pennsylvania State University

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms7009

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