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Mobility edge for cold atoms in laser speckle potentials.
Dominique Delande1, Giuliano Orso2
1Laboratoire Kastler Brossel, UPMC-Paris6, ENS, CNRS; 4 Place Jussieu, F-75005 Paris, France.
Physical Review Letters
|August 23, 2014
Summary
We precisely calculated the mobility edge for atoms in laser speckle potentials, finding it
Area of Science:
- Atomic physics
- Quantum mechanics
- Condensed matter physics
Background:
- Atom localization in disordered potentials is crucial for quantum technologies.
- Previous theoretical models for localization lack precision.
Purpose of the Study:
- To accurately compute the mobility edge of atoms in laser speckle potentials.
- To investigate the dependence of the mobility edge on disorder strength and correlation.
- To compare numerical results with approximate theoretical models.
Main Methods:
- Numerical computation using the transfer-matrix method.
- Analysis of atomic behavior in laser speckle potentials.
Main Results:
- Precise determination of the mobility edge position.
- Significant deviation from previous approximate theoretical estimates.
- Lower mobility edge observed in blue-detuned speckles compared to red-detuned speckles.
- Identification of the crucial role of asymmetric on-site distribution in speckle patterns.
Conclusions:
- The transfer-matrix method provides accurate predictions for atom localization.
- Asymmetric speckle patterns significantly influence the mobility edge.
- Revises understanding of Anderson localization in complex potentials.
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