Spatial Bloch Oscillations of a Quantum Gas in a Beat-Note Superlattice

Year: 2021

Authors: Masi L., Petrucciani T., Ferioli G., Semeghini G., Modugno G., Inguscio M., Fattori M.

Autors Affiliation: CNR, Ist Nazl Ott, I-50019 Sesto Fiorentino, Italy; European Lab Nonlinear Spect LENS, I-50019 Sesto Fiorentino, Italy; Univ Florence, Dept Phys & Astron, I-50019 Sesto Fiorentino, Italy; Campus Biomed Univ Rome, Dept Engn, I-00128 Rome, Italy.

Abstract: We report the experimental realization of a new kind of optical lattice for ultracold atoms where arbitrarily large separation between the sites can be achieved without renouncing to the stability of ordinary lattices. Two collinear lasers, with slightly different commensurate wavelengths and retroreflected on a mirror, generate a superlattice potential with a periodic beat-note profile where the regions with large amplitude modulation provide the effective potential minima for the atoms. To prove the analogy with a standard large spacing optical lattice we study Bloch oscillations of a Bose Einstein condensate with negligible interactions in the presence of a small force. The observed dynamics between sites separated by ten microns for times exceeding one second proves the high stability of the potential. This novel lattice is the ideal candidate for the coherent manipulation of atomic samples at large spatial separations and might find direct application in atom-based technologies like trapped-atom interferometers and quantum simulators.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 127 (2)      Pages from: 20601-1  to: 20601-6

More Information: We thank all our colleagues of the Quantum Degenerate Group at LENS for support, M. Modugno for inspiring discussions during the early stages of this study, and D. Trypogeorgos for careful reading of the manuscript. This work was supported by the project TAIOL of QuantERA ERA-NET Cofund in Quantum Technologies (Grant Agreement No. 731473) implemented within the European Unions Horizon 2020 Programme.
KeyWords: Double-well; Dynamics
DOI: 10.1103/PhysRevLett.127.020601

Citations: 12
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