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Anderson localization of a non-interacting Bose-Einstein condensate
Giacomo Roati1, Chiara D'Errico, Leonardo Fallani
1LENS and Dipartimento di Fisica, Università di Firenze, 50019 Sesto Fiorentino, Italy.
Nature
|June 13, 2008
Summary
Scientists observed Anderson localization for matter waves using ultracold atoms in a quasi-periodic lattice. This demonstrates wave localization in a controllable system, opening doors for studying quantum phenomena.
Area of Science:
- Quantum physics
- Condensed matter physics
- Wave phenomena
Background:
- Anderson localization, predicted for electron transport, is a general wave phenomenon observed in various systems like light waves.
- Direct observation of Anderson localization for matter waves has been challenging.
- Ultracold atoms provide a highly controllable platform for studying disorder-induced localization.
Purpose of the Study:
- To experimentally demonstrate Anderson localization for matter waves.
- To investigate the crossover between extended and localized states in a quasi-periodic lattice.
- To characterize the critical disorder strength in relation to atomic tunnelling energy.
Main Methods:
- Utilizing a non-interacting Bose-Einstein condensate.
- Employing a one-dimensional quasi-periodic optical lattice.
- Analyzing transport properties, spatial distributions, and momentum distributions.
Main Results:
- Clear experimental demonstration of Anderson localization for matter waves.
- Characterization of the crossover regime, showing a transition from extended to localized states.
- Determination that critical disorder strength scales with tunnelling energy.
Conclusions:
- Ultracold atoms in quasi-periodic lattices provide a viable system for observing Anderson localization of matter waves.
- The controllable nature of this system facilitates the study of disorder-induced phenomena.
- This platform can be used to explore the interplay of disorder and interactions, and exotic quantum phases.
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