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Topological Pumping in a Floquet-Bloch Band
Joaquín Minguzzi1, Zijie Zhu1, Kilian Sandholzer1
1Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland.
Physical Review Letters
|August 12, 2022
Summary
Researchers demonstrated topological pumping in ultracold fermions using a simple sinusoidal lattice and two-tone Floquet engineering. This simplifies experimental requirements for creating topological materials for quantum applications.
Area of Science:
- Condensed Matter Physics
- Quantum Materials
- Ultracold Atomic Gases
Background:
- Topological materials are crucial for quantum applications but often require complex experimental setups.
- Simplifying these requirements is key to broader implementation.
- Floquet engineering offers a route to engineer topological properties.
Purpose of the Study:
- To experimentally demonstrate topological pumping in a Floquet-Bloch band.
- To simplify the experimental requirements for creating topological materials.
- To establish a new paradigm for engineering topological matter.
Main Methods:
- Utilized ultracold fermions in a sinusoidal lattice potential.
- Employed two-tone driving with frequencies ω and 2ω.
- Adiabatically prepared a Floquet band via a frequency chirp.
- Induced topological pumping by modulating the amplitude and phase of the 2ω drive.
Main Results:
- Successfully demonstrated topological pumping in a Floquet-Bloch band.
- Achieved adiabatic preparation of a near-insulating band, avoiding gap closings.
- The system behavior was accurately described by an effective Shockley model.
- Showcased a novel method for engineering topological matter.
Conclusions:
- A simplified approach to engineer topological materials using Floquet engineering and simple lattice structures has been experimentally realized.
- This method avoids complex experimental overheads like magnetic fields or spin-orbit coupling.
- The demonstrated topological pumping could find applications in metrology and future quantum technologies.
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