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Experimental Demonstration of a Synthetic Lorentz Force by Using Radiation Pressure.

Šantić N, Dubček T, Aumiler D, Buljan H, Ban T - Sci Rep (2015)

Bottom Line: Synthetic magnetism in cold atomic gases opened the doors to many exciting novel physical systems and phenomena.They include rapidly rotating Bose-Einstein condensates employing the analogy between the Coriolis and the Lorentz force, and laser-atom interactions employing the analogy between the Berry phase and the Aharonov-Bohm phase.Our novel concept is straightforward to implement in a large volume, for a broad range of velocities, and can be extended to different geometries.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, University of Zagreb, Bijenička c. 32, 10000 Zagreb, Croatia.

ABSTRACT
Synthetic magnetism in cold atomic gases opened the doors to many exciting novel physical systems and phenomena. Ubiquitous are the methods used for the creation of synthetic magnetic fields. They include rapidly rotating Bose-Einstein condensates employing the analogy between the Coriolis and the Lorentz force, and laser-atom interactions employing the analogy between the Berry phase and the Aharonov-Bohm phase. Interestingly, radiation pressure - being one of the most common forces induced by light - has not yet been used for synthetic magnetism. We experimentally demonstrate a synthetic Lorentz force, based on the radiation pressure and the Doppler effect, by observing the centre-of-mass motion of a cold atomic cloud. The force is perpendicular to the velocity of the cold atomic cloud, and zero for the cloud at rest. Our novel concept is straightforward to implement in a large volume, for a broad range of velocities, and can be extended to different geometries.

No MeSH data available.


Related in: MedlinePlus

The trajectories of the CM of the atomic cloud in the presence of the synthetic Lorentz force.(a) x(t), and (b) y(t) for three different initial velocities, vx = 0.6 m/s >0 (circles), vx = −0.3 m/s <0 (squares), and vx = 0 m/s (diamonds); initial component of vy = 0 in all measurements. Accelerating motion along y is the signature of the transverse force Fy, which depends on vx. The lines are fitted to the experimental data, linear fits for vx(t), and quadratic for vy(t).
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f2: The trajectories of the CM of the atomic cloud in the presence of the synthetic Lorentz force.(a) x(t), and (b) y(t) for three different initial velocities, vx = 0.6 m/s >0 (circles), vx = −0.3 m/s <0 (squares), and vx = 0 m/s (diamonds); initial component of vy = 0 in all measurements. Accelerating motion along y is the signature of the transverse force Fy, which depends on vx. The lines are fitted to the experimental data, linear fits for vx(t), and quadratic for vy(t).

Mentions: The results of the experiment are illustrated in Fig. 2. We show the trajectory of the cloud (x(t), y(t)), in the presence of the synthetic Lorentz force, for three initial velocities: vx = −0.3 m/s (squares), vx = 0 m/s (diamonds), and vx = 0.6 m/s (circles); vy = 0 at t = 0 in each run of the experiment. There is a difference in the magnitude of the initial vx for the positive and negative velocity [circles and squares in Fig. 2(a)], which is a result of our MOT retro-reflected geometry, and the way we accelerate the cloud in step (ii) of the protocol. In order to prepare a cloud with positive vx, the cloud is accelerated with the incoming MOT beam (coming from the laser side of the setup), whereas acceleration in the opposite direction is performed with the reflected beam which has smaller intensity. The reflected beam intensity is smaller due to the losses, which are a result of the passage of the incoming beam through the dense cloud (absorption), and partially due to reflection. Consequently, the negative initial velocity is smaller than the positive velocity.


Experimental Demonstration of a Synthetic Lorentz Force by Using Radiation Pressure.

Šantić N, Dubček T, Aumiler D, Buljan H, Ban T - Sci Rep (2015)

The trajectories of the CM of the atomic cloud in the presence of the synthetic Lorentz force.(a) x(t), and (b) y(t) for three different initial velocities, vx = 0.6 m/s >0 (circles), vx = −0.3 m/s <0 (squares), and vx = 0 m/s (diamonds); initial component of vy = 0 in all measurements. Accelerating motion along y is the signature of the transverse force Fy, which depends on vx. The lines are fitted to the experimental data, linear fits for vx(t), and quadratic for vy(t).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4556972&req=5

f2: The trajectories of the CM of the atomic cloud in the presence of the synthetic Lorentz force.(a) x(t), and (b) y(t) for three different initial velocities, vx = 0.6 m/s >0 (circles), vx = −0.3 m/s <0 (squares), and vx = 0 m/s (diamonds); initial component of vy = 0 in all measurements. Accelerating motion along y is the signature of the transverse force Fy, which depends on vx. The lines are fitted to the experimental data, linear fits for vx(t), and quadratic for vy(t).
Mentions: The results of the experiment are illustrated in Fig. 2. We show the trajectory of the cloud (x(t), y(t)), in the presence of the synthetic Lorentz force, for three initial velocities: vx = −0.3 m/s (squares), vx = 0 m/s (diamonds), and vx = 0.6 m/s (circles); vy = 0 at t = 0 in each run of the experiment. There is a difference in the magnitude of the initial vx for the positive and negative velocity [circles and squares in Fig. 2(a)], which is a result of our MOT retro-reflected geometry, and the way we accelerate the cloud in step (ii) of the protocol. In order to prepare a cloud with positive vx, the cloud is accelerated with the incoming MOT beam (coming from the laser side of the setup), whereas acceleration in the opposite direction is performed with the reflected beam which has smaller intensity. The reflected beam intensity is smaller due to the losses, which are a result of the passage of the incoming beam through the dense cloud (absorption), and partially due to reflection. Consequently, the negative initial velocity is smaller than the positive velocity.

Bottom Line: Synthetic magnetism in cold atomic gases opened the doors to many exciting novel physical systems and phenomena.They include rapidly rotating Bose-Einstein condensates employing the analogy between the Coriolis and the Lorentz force, and laser-atom interactions employing the analogy between the Berry phase and the Aharonov-Bohm phase.Our novel concept is straightforward to implement in a large volume, for a broad range of velocities, and can be extended to different geometries.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, University of Zagreb, Bijenička c. 32, 10000 Zagreb, Croatia.

ABSTRACT
Synthetic magnetism in cold atomic gases opened the doors to many exciting novel physical systems and phenomena. Ubiquitous are the methods used for the creation of synthetic magnetic fields. They include rapidly rotating Bose-Einstein condensates employing the analogy between the Coriolis and the Lorentz force, and laser-atom interactions employing the analogy between the Berry phase and the Aharonov-Bohm phase. Interestingly, radiation pressure - being one of the most common forces induced by light - has not yet been used for synthetic magnetism. We experimentally demonstrate a synthetic Lorentz force, based on the radiation pressure and the Doppler effect, by observing the centre-of-mass motion of a cold atomic cloud. The force is perpendicular to the velocity of the cold atomic cloud, and zero for the cloud at rest. Our novel concept is straightforward to implement in a large volume, for a broad range of velocities, and can be extended to different geometries.

No MeSH data available.


Related in: MedlinePlus