Bloch oscillations with a metastable helium Bose-Einstein condensate

Autor: R. F. H. J. van der Beek, Kjeld S. E. Eikema, Wim Vassen, Hendrick L. Bethlem, O. Onishchenko
Přispěvatelé: Atoms, Molecules, Lasers, LaserLaB - Physics of Light, Precision Frontier
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Physical Review A, 102(6):061302, 1-6. American Physical Society
Physical Review A, 102(6):061302. AMER PHYSICAL SOC
Van Der Beek, R F H J, Onishchenko, O, Vassen, W, Eikema, K S E & Bethlem, H L 2020, ' Bloch oscillations with a metastable helium Bose-Einstein condensate ', Physical Review A, vol. 102, no. 6, 061302, pp. 1-6 . https://doi.org/10.1103/PhysRevA.102.061302
ISSN: 2469-9926
DOI: 10.1103/PhysRevA.102.061302
Popis: We have observed Bloch oscillations of a ${}^{4}{\text{He}}^{*}$ Bose-Einstein condensate in an optical lattice at 1557.3 nm. Due to its low mass, metastable helium was efficiently accelerated orders of magnitude faster than demonstrated with other atoms. In a horizontal lattice, we could transfer a total of $800\ensuremath{\hbar}k$ of momentum by shuttling the atomic cloud back and forth 50 times between the $4\ensuremath{\hbar}k$ and $\ensuremath{-}4\ensuremath{\hbar}k$ momentum states with an efficiency of over 99% per Bloch cycle. In a vertical lattice, gravity-induced Bloch oscillations were demonstrated, from which the local gravitational acceleration was derived with a statistical uncertainty of $4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$. A clear advantage of ${\text{He}}^{*}$ over other atoms is that it can be detected with a microchannel plate detector with near unity efficiency, and this enabled observation of Bloch oscillations up to 12 s even though the number of atoms decreased by three orders of magnitude. These results establish ${\text{He}}^{*}$ as a promising candidate for future precision measurements with atom interferometry.
Databáze: OpenAIRE
načítá se...