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 |
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| Přispěvatelé: | Atoms, Molecules, Lasers, LaserLaB - Physics of Light, Precision Frontier |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Optical lattice Lattice (group) chemistry.chemical_element 01 natural sciences 010305 fluids & plasmas law.invention Momentum Orders of magnitude (time) chemistry law Metastability 0103 physical sciences Bloch oscillations SDG 7 - Affordable and Clean Energy Atomic physics 010306 general physics Helium Bose–Einstein condensate |
| 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 |
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