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Updated: Jul 6, 2026
11:21
Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Coherent delocalization of atomic wave packets in driven lattice potentials.
V V Ivanov1, A Alberti, M Schioppo
1Dipartimento di Fisica and LENS-Università di Firenze, CNR-INFM, INFN-Sezione di Firenze, via Sansone 1, 50019 Sesto Fiorentino, Italy.
Physical Review Letters
|March 21, 2008
Summary
Atomic wave packets in optical lattices show delocalization dynamics via intraband transitions. Researchers observed resonances linked to Bloch frequency, enabling precise gravity measurements.
Area of Science:
- Quantum physics
- Atomic physics
- Condensed matter physics
Background:
- Atomic wave packets in optical lattices exhibit complex dynamics.
- Intraband transitions among Wannier-Stark levels are crucial for understanding quantum phenomena.
Purpose of the Study:
- To observe and characterize intraband transitions in phase-modulated optical lattices.
- To investigate the relationship between modulation frequency and resonance phenomena.
- To explore the potential for precise measurement of fundamental constants.
Main Methods:
- Loading atomic wave packets into a phase-modulated vertical optical-lattice potential.
- Monitoring the in situ wave-packet extent to observe delocalization dynamics.
- Varying modulation frequency to identify resonances at multiples of the Bloch frequency.
Main Results:
- Coherent delocalization dynamics of atomic wave packets were observed.
- Resonances were found at integer multiples of the Bloch frequency.
- Resonances exhibited Fourier-limited width for interrogation times up to 2 seconds.
Conclusions:
- Intraband transitions in optical lattices can be effectively monitored.
- The observed resonances provide a new method for precise gravity acceleration determination.
- This technique offers potential for high-resolution measurements in fundamental physics.
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