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Rectified momentum transport for a kicked Bose-Einstein condensate
Mark Sadgrove1, Munekazu Horikoshi, Tetsuo Sekimura
1Institute for Laser Science, The University of Electro Communications, Chofushi, Chofugaoka 1-5-1, Japan. mark@ils.uec.ac.jp
Physical Review Letters
|August 7, 2007
Summary
We observed rectified momentum transport in Bose-Einstein condensates using quantum resonance. Changing the phase of superposed atomic states directed momentum current, a uniquely quantum effect.
Area of Science:
- Quantum physics
- Atomic physics
- Condensed matter physics
Background:
- Bose-Einstein condensates (BECs) exhibit quantum phenomena.
- Optical standing waves can manipulate atomic momentum.
- Talbot time (quantum resonance) is a key regime for wave interference.
Purpose of the Study:
- To experimentally observe rectified momentum transport in a BEC.
- To investigate the role of quantum superposition and phase in momentum transfer.
- To demonstrate a uniquely quantum mechanical effect in atomic transport.
Main Methods:
- Preparing atoms in a superposition of 0 and -2hkl momentum states using an optical π/2 pulse.
- Kicking the BEC at Talbot time with an optical standing wave.
- Modulating the relative phase of the superposed atomic states.
Main Results:
- Experimental observation of rectified momentum transport in the BEC.
- Demonstration of directional momentum current control by adjusting the relative phase.
- Confirmation of the quantum mechanical origin of the observed transport.
Conclusions:
- Rectified momentum transport in BECs is achievable via quantum resonance.
- Matter-wave interference provides a valid interpretation for the observed phenomenon.
- The effect highlights the unique quantum nature of atomic transport control.
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