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Interaction Effects on the Dynamical Anderson Metal-Insulator Transition Using Kicked Quantum Gases
Jun Hui See Toh1, Mengxin Du2, Xinxin Tang1
1Department of Physics, <a href="https://ror.org/00cvxb145">University of Washington</a>, Seattle, Washington, USA.
Physical Review Letters
|August 30, 2024
Summary
This study explores interaction effects on quantum transport in disordered systems using kicked ultracold atomic gases. Researchers observed interaction-driven subdiffusion and a diverging delocalization time near the metal-insulator transition phase boundary.
Area of Science:
- Quantum physics
- Condensed matter physics
- Ultracold atomic gases
Background:
- Understanding quantum transport with interactions and disorder is a major scientific challenge.
- Previous studies on high-dimensional disordered systems, like the 3D Anderson metal-insulator transition, are limited.
- Kicked quantum gases offer a platform to study Anderson localization analogs (dynamical localization).
Purpose of the Study:
- To experimentally investigate interaction effects on the three-dimensional dynamical Anderson metal-insulator transition.
- To explore quantum transport phenomena in a momentum space lattice using quasiperiodically kicked ultracold atomic gases.
Main Methods:
- Utilized a momentum space lattice platform with quasiperiodically kicked ultracold atomic gases.
- Investigated interaction effects on the 3D dynamical Anderson metal-insulator transition.
- Performed mean-field numerical simulations for comparison.
Main Results:
- Observed interaction-driven subdiffusion.
- Noted a divergence of delocalization onset time as the phase boundary was approached.
- Mean-field simulations showed qualitative agreement but significant quantitative deviations from experimental results.
Conclusions:
- The study successfully investigated interaction effects on the 3D dynamical Anderson metal-insulator transition using kicked atomic gases.
- Experimental findings on subdiffusion and delocalization time divergence provide new insights into quantum transport in disordered systems.
- Discrepancies between experiments and mean-field theory highlight the need for more advanced theoretical models for strongly interacting disordered systems.
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