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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

Interpretation of the synthetic Lorentz force from Figs 1 and 2, via two-step two-photon resonances presented in Fig. 3Sketch of the resonant peaks that would be obtained in the setup shown in Fig. 3 for three atomic velocities: (a) vx < 0, (b) vx = 0, and (c) vx > 0. Vertical dotted lines illustrate the values of the detuning used for the lasers aligned on the y-axis in Fig. 1. Arrows denote the direction of the force exerted by those lasers, and illustrate the way Fy observed in Fig. 2 arises as a function of velocity vx. See text for details.
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f4: Interpretation of the synthetic Lorentz force from Figs 1 and 2, via two-step two-photon resonances presented in Fig. 3Sketch of the resonant peaks that would be obtained in the setup shown in Fig. 3 for three atomic velocities: (a) vx < 0, (b) vx = 0, and (c) vx > 0. Vertical dotted lines illustrate the values of the detuning used for the lasers aligned on the y-axis in Fig. 1. Arrows denote the direction of the force exerted by those lasers, and illustrate the way Fy observed in Fig. 2 arises as a function of velocity vx. See text for details.

Mentions: Suppose that we repeat measurements corresponding to Fig. 3, but for an atomic cloud with mean velocity vx different from zero. The results of such measurements would be identical as for vx = 0, but the positions of the peaks would correspond to the Doppler shifted detuning values δ→ − kvx and δ← + kvx. Thus, because detuning can be mapped to velocity space, Fig. 3 can be reinterpreted as measurements for a fixed value of δ← = −δ→, and for three different velocities vx < 0 (4 MHz), vx = 0 (6 MHz), and vx > 0 (8 MHz). This is sketched in Fig. 4, where we see that the two peaks separate (approach) each other for vx > 0 (vx < 0, respectively).


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

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

Interpretation of the synthetic Lorentz force from Figs 1 and 2, via two-step two-photon resonances presented in Fig. 3Sketch of the resonant peaks that would be obtained in the setup shown in Fig. 3 for three atomic velocities: (a) vx < 0, (b) vx = 0, and (c) vx > 0. Vertical dotted lines illustrate the values of the detuning used for the lasers aligned on the y-axis in Fig. 1. Arrows denote the direction of the force exerted by those lasers, and illustrate the way Fy observed in Fig. 2 arises as a function of velocity vx. See text for details.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f4: Interpretation of the synthetic Lorentz force from Figs 1 and 2, via two-step two-photon resonances presented in Fig. 3Sketch of the resonant peaks that would be obtained in the setup shown in Fig. 3 for three atomic velocities: (a) vx < 0, (b) vx = 0, and (c) vx > 0. Vertical dotted lines illustrate the values of the detuning used for the lasers aligned on the y-axis in Fig. 1. Arrows denote the direction of the force exerted by those lasers, and illustrate the way Fy observed in Fig. 2 arises as a function of velocity vx. See text for details.
Mentions: Suppose that we repeat measurements corresponding to Fig. 3, but for an atomic cloud with mean velocity vx different from zero. The results of such measurements would be identical as for vx = 0, but the positions of the peaks would correspond to the Doppler shifted detuning values δ→ − kvx and δ← + kvx. Thus, because detuning can be mapped to velocity space, Fig. 3 can be reinterpreted as measurements for a fixed value of δ← = −δ→, and for three different velocities vx < 0 (4 MHz), vx = 0 (6 MHz), and vx > 0 (8 MHz). This is sketched in Fig. 4, where we see that the two peaks separate (approach) each other for vx > 0 (vx < 0, respectively).

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