Gustavsson, Mattias K ; Haller, Elmar ; Mark, Manfred J ; Danzl, Johannes G ; Hart, Russell A ; Daley, Andrew J ; Nägerl, Hanns C
The phenomenon of matter-wave interference lies at the heart of quantum physics. It has been observed in various contexts in the limit of non-interacting particles as a single-particle effect. Here we observe and control matter-wave interference whose evolution is driven by interparticle interactions. In a multi-path matter-wave interferometer, the macroscopic manybody wave function of an interacting atomic Bose-Einstein condensate develops a regular interference pattern, allowing us to detect and directly visualize the effect of interaction-induced phase shifts. We demonstrate control over the phase evolution by inhibiting interaction-induced dephasing and by refocusing a dephased macroscopic matter wave in a spin-echo-type experiment. Our results show that interactions in a many-body system lead to a surprisingly coherent evolution, possibly enabling narrow-band and high-brightness matterwave interferometers based on atom lasers.
New Journal of Physics
We thank E Arimondo, O Morsch, W Schleich, A Smerzi, D Witthaut and A Buchleitner and his group for helpful discussions. We also thank R Grimm for generous support. We gratefully acknowledge funding from the Austrian Ministry of Science and Research (Bundesministerium für Wissenschaft und Forschung) and the Austrian Science Fund (Fonds zur Förderung der wissenschaftlichen Forschung) in the form of a START prize grant and through SFB 15. RH is supported by a Marie Curie International Incoming Fellowship within the 7th European Community Framework Programme.
Gustavsson M, Haller E, Mark M, et al. Interference of interacting matter waves. New Journal of Physics. 2010;12. doi:10.1088/1367-2630/12/6/065029
Gustavsson, M., Haller, E., Mark, M., Danzl, J., Hart, R., Daley, A., & Nägerl, H. (2010). Interference of interacting matter waves. New Journal of Physics, 12. https://doi.org/10.1088/1367-2630/12/6/065029
Gustavsson, Mattias, Elmar Haller, Manfred Mark, Johannes Danzl, Russell Hart, Andrew Daley, and Hanns Nägerl. “Interference of Interacting Matter Waves.” New Journal of Physics 12 (2010). https://doi.org/10.1088/1367-2630/12/6/065029.
M. Gustavsson et al., “Interference of interacting matter waves,” New Journal of Physics, vol. 12, 2010.
Gustavsson M, Haller E, Mark M, Danzl J, Hart R, Daley A, Nägerl H. 2010. Interference of interacting matter waves. New Journal of Physics. 12.
Gustavsson, Mattias, et al. “Interference of Interacting Matter Waves.” New Journal of Physics, vol. 12, IOP Publishing Ltd., 2010, doi:10.1088/1367-2630/12/6/065029.