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Phase control of directed diffusion in a symmetric optical lattice
M Schiavoni1, L Sanchez-Palencia, F Renzoni
1Laboratoire Kastler Brossel, Département de Physique de l'Ecole Normale Supérieure, 24, rue Lhomond, 75231, Paris Cedex 05, France.
Physical Review Letters
|April 12, 2003
Summary
We demonstrate directed diffusion using cold atoms in a dissipative optical lattice. Breaking temporal symmetry with phase modulation induces directed motion in the atoms.
Area of Science:
- Atomic physics
- Quantum optics
- Condensed matter physics
Background:
- Directed diffusion is a phenomenon where particles move preferentially in one direction within a periodic potential.
- Understanding and controlling particle transport in periodic structures is crucial for various applications.
Purpose of the Study:
- To demonstrate and investigate directed diffusion in a symmetric periodic potential.
- To realize this phenomenon using cold atoms in a one-dimensional dissipative optical lattice.
Main Methods:
- Utilizing cold atoms trapped in a one-dimensional optical lattice.
- Implementing a stochastic optical pumping process to induce diffusive dynamics.
- Applying a zero-mean force by phase-modulating one of the lattice beams to break temporal symmetry.
Main Results:
- Observed directed diffusion of cold atoms in the dissipative optical lattice.
- Demonstrated that breaking temporal symmetry leads to directed motion.
- Showcased the control over atomic transport through tailored optical potentials.
Conclusions:
- Directed diffusion can be effectively realized and controlled in cold atom systems.
- The breaking of temporal symmetry is a key mechanism for inducing directed motion.
- This work provides a platform for exploring fundamental transport phenomena and potential applications in quantum technologies.