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Interaction Dependent Heating and Atom Loss in a Periodically Driven Optical Lattice.

Martin Reitter^1,2, Jakob Näger^1,2, Karen Wintersperger^1,2

¹Fakultät für Physik, Ludwig-Maximilians-Universität München, Schellingstraße 4, 80799 Munich, Germany.

Physical Review Letters

|December 9, 2017

Summary

Researchers studied heating in driven optical lattices with interacting Bose-Einstein condensates. They discovered a method, Floquet evaporative cooling, that significantly reduces heating by ejecting scattered atoms from the trap.

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Area of Science:

Quantum physics
Atomic physics
Condensed matter physics

Background:

Periodic driving of optical lattices creates novel band structures, including topological bands for neutral particles.
Driven systems with interacting bosons often experience significant heating, limiting their study.

Purpose of the Study:

To systematically investigate heating mechanisms in interacting Bose-Einstein condensates within driven one-dimensional optical lattices.
To identify the specific scattering processes responsible for heating and explore methods to mitigate it.

Main Methods:

Experimental study of heating rates in Bose-Einstein condensates subjected to periodic driving in an optical lattice.
Theoretical modeling to identify resonant intra- and interband scattering processes.
Comparison of experimental data with theoretical predictions.

Main Results:

Heating rates were found to be dependent on both scattering length and driving strength.
Resonant intra- and interband scattering processes were identified as the primary causes of heating.
For driving frequencies significantly above trap depth, heating rates were dramatically reduced.

Conclusions:

A mechanism termed Floquet evaporative cooling effectively minimizes heating in driven quantum gases.
This cooling strategy leverages the ejection of resonantly scattered atoms before energy dissipation.
Floquet evaporative cooling presents a powerful approach for studying Floquet-engineered quantum gases.