A quadruply-charged quantized vortex has been created successfully in the 87 Rb Bose-Einstein Condensate (BEC). The condensate was confined in a cloverleaf magnetic trap, and the vortex was formed by the reversal of the axial magnetic field. The vortex could be observed only in a holding time of about 1 ms, which was much shorter than that reported in the Na BEC, and the vortex position was also unstable in the BEC. To overcome these experimental difficulties, we took the following two measures and improved the vortex formation: (i) axial confinement with a FORT, which prevents the BEC from axial expansion after the field reversal, and (ii) compensation of gravity with a blue-detuned laser beam, which removes the gravitational sag.A quadruply-charged quantized vortex has been created successfully in the 87 Rb Bose-Einstein Condensate (BEC). The condensate was confined in a cloverleaf magnetic trap, and the vortex was formed by the reversal of the axial magnetic field. The vortex could be observed only in a holding time of about 1 ms, which was much shorter than that reported in the Na BEC, and the vortex position was also unstable in the BEC. To overcome these experimental difficulties, we took the following two measures and improved the vortex formation: (i) axial confinement with a FORT, which prevents the BEC from axial expansion after the field reversal, and (ii) compensation of gravity with a blue-detuned laser beam, which removes the gravitational sag.

Laser PhysicsFeb 1, 20067 citations

Vortex formation in a stirred Bose-Einstein condensate

Madison, Chevy, Wohlleben

Quantum Electronics and Laser Science ConferenceJan 1, 20000 citations

Vortex production in Bose–Einstein condensates

Tapio Simula

Morgan & Claypool Publishers eBooksJul 1, 20190 citations

Topological formation of a multiply charged vortex in the Rb Bose-Einstein condensate: Effectiveness of the gravity compensation

M. Kumakura, T. Hirotani, Masayuki Okano +2 more

In a Bose-Einstein condensate of $^{87}\mathrm{Rb}$ $(F=2,{m}_{F}=2)$ atoms we have topologically created a quantized vortex with a charge of 4 by reversing the magnetic field of the trap. Experimental conditions of reversal time and initial magnetic field strength for the successful vortex creation were restricted within narrower ranges, compared to those in the case of the $^{23}\mathrm{Na}$ condensate. The experimental difficulty was explained in terms of a non-negligible gravitational sag arising from its large atomic mass. We have successfully stabilized the vortex formation by compensating gravity with a blue-detuned laser beam.In a Bose-Einstein condensate of $^{87}\mathrm{Rb}$ $(F=2,{m}_{F}=2)$ atoms we have topologically created a quantized vortex with a charge of 4 by reversing the magnetic field of the trap. Experimental conditions of reversal time and initial magnetic field strength for the successful vortex creation were restricted within narrower ranges, compared to those in the case of the $^{23}\mathrm{Na}$ condensate. The experimental difficulty was explained in terms of a non-negligible gravitational sag arising from its large atomic mass. We have successfully stabilized the vortex formation by compensating gravity with a blue-detuned laser beam.

Physical Review AJun 6, 200637 citations

In a Bose-Einstein condensate of

^{87}\mathrm{Rb}

(F=2,{m}_{F}=2)

atoms we have topologically created a quantized vortex with a charge of 4 by reversing the magnetic field of the trap. Experimental conditions of reversal time and initial magnetic field strength for the successful vortex creation were restricted within narrower ranges, compared to those in the case of the

^{23}\mathrm{Na}

condensate. The experimental difficulty was explained in terms of a non-negligible gravitational sag arising from its large atomic mass. We have successfully stabilized the vortex formation by compensating gravity with a blue-detuned laser beam.