Tunable dipolar resonances and Einstein-de Haas effect in a {sup 87}Rb-atom condensate

Journal Article · Wed Jun 15 00:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.063617· OSTI ID:21550162

Swislocki, Tomasz; Sowinski, Tomasz; Pietraszewicz, Joanna; Gajda, Mariusz ^[1]; Brewczyk, Miroslaw ^[2]; Lewenstein, Maciej ^[3]; Zakrzewski, Jakub ^[4]

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1. Instytut Fizyki PAN, Al. Lotnikow 32/46, PL-02-668 Warszawa (Poland)
2. Wydzial Fizyki, Uniwersytet w Bialymstoku, ul. Lipowa 41, PL-15-424 Bialystok (Poland)
3. ICFO, Institut de Ciences Fotoniques, Parc Mediterrani de la Tecnologia, E-08860 Castelldefels, Barcelona (Spain)
4. Instytut Fizyki im. Mariana Smoluchowskiego, Uniwersytet Jagiellonski, ul. Reymonta 4, PL-30-059 Krakow (Poland)

We theoretically study a spinor condensate of {sup 87}Rb atoms in a F=1 hyperfine state confined in an optical dipole trap. Putting initially all atoms in an m{sub F}=1, component we observe a significant transfer of atoms to other, initially empty Zeeman states exclusively due to dipolar forces. Because of conservation of a total angular momentum the atoms going to other Zeeman components acquire an orbital angular momentum and circulate around the center of the trap. This is a realization of the Einstein-de Haas effect in a system of cold gases. We show that the transfer of atoms via dipolar interactions is possible only when the energies of the initial and the final sates are equal. This condition can be fulfilled utilizing a resonant external magnetic field, which tunes energies of involved states via the linear Zeeman effect. We found that there are many final states of different spatial density, which can be tuned selectively to the initial state. We show a simple model explaining high selectivity and controllability of weak dipolar interactions in the condensate of {sup 87}Rb atoms.

• OSTI ID: 21550162
• Journal Information: Physical Review. A, Vol. 83, Issue 6; Other Information: DOI: 10.1103/PhysRevA.83.063617; (c) 2011 American Institute of Physics; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
36 MATERIALS SCIENCE
ATOMS
DENSITY
DIPOLES
EINSTEIN EFFECT
FINAL-STATE INTERACTIONS
MAGNETIC FIELDS
ORBITAL ANGULAR MOMENTUM
RESONANCE
RUBIDIUM 87
TRAPS
ZEEMAN EFFECT
ANGULAR MOMENTUM
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
INTERACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
MULTIPOLES
NUCLEI
ODD-EVEN NUCLEI
PHYSICAL PROPERTIES
RADIOISOTOPES
RUBIDIUM ISOTOPES
YEARS LIVING RADIOISOTOPES