TY - JOUR
T1 - Tunable dual-species Bose-Einstein condensates of K 39 and Rb 87
AU - Wacker, L.
AU - Jørgensen, N. B.
AU - Birkmose, D.
AU - Horchani, R.
AU - Ertmer, W.
AU - Klempt, C.
AU - Winter, N.
AU - Sherson, J.
AU - Arlt, J. J.
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/11/4
Y1 - 2015/11/4
N2 - We present the production of dual-species Bose-Einstein condensates (BECs) of K39 and Rb87. Preparation of both species in the F=1,mF=-1 state enabled us to exploit a total of three Feshbach resonances, which allows for simultaneous Feshbach tuning of the K39 intraspecies and the K39-Rb87 interspecies scattering length. Thus dual-species Bose-Einstein condensates were produced by sympathetic cooling of K39 with Rb87. A dark spontaneous force optical trap was used for Rb87 to reduce the losses in K39 due to light-assisted collisions in the optical trapping phase, which can be of benefit for other dual-species experiments. The tunability of the scattering length was used to perform precision spectroscopy of the interspecies Feshbach resonance located at 117.56(2) G and to determine the width of the resonance to 1.21(5) G by rethermalization measurements. The transition region from miscible to immiscible dual-species condensates was investigated and the interspecies background scattering length was determined to 28.5a0 using an empirical model. This paves the way for dual-species experiments with K39 and Rb87 BECs ranging from molecular physics to precision metrology.
AB - We present the production of dual-species Bose-Einstein condensates (BECs) of K39 and Rb87. Preparation of both species in the F=1,mF=-1 state enabled us to exploit a total of three Feshbach resonances, which allows for simultaneous Feshbach tuning of the K39 intraspecies and the K39-Rb87 interspecies scattering length. Thus dual-species Bose-Einstein condensates were produced by sympathetic cooling of K39 with Rb87. A dark spontaneous force optical trap was used for Rb87 to reduce the losses in K39 due to light-assisted collisions in the optical trapping phase, which can be of benefit for other dual-species experiments. The tunability of the scattering length was used to perform precision spectroscopy of the interspecies Feshbach resonance located at 117.56(2) G and to determine the width of the resonance to 1.21(5) G by rethermalization measurements. The transition region from miscible to immiscible dual-species condensates was investigated and the interspecies background scattering length was determined to 28.5a0 using an empirical model. This paves the way for dual-species experiments with K39 and Rb87 BECs ranging from molecular physics to precision metrology.
UR - http://www.scopus.com/inward/record.url?scp=84946781728&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84946781728&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.92.053602
DO - 10.1103/PhysRevA.92.053602
M3 - Article
AN - SCOPUS:84946781728
SN - 1050-2947
VL - 92
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 5
M1 - 053602
ER -