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Quantization and its breakdown in a Hubbard-Thouless pump.

Anne-Sophie Walter1, Zijie Zhu1, Marius Gächter1

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Summary
This summary is machine-generated.

This study demonstrates a topological Thouless pump with tunable interactions in an optical lattice. Researchers observed robust pumping and interaction-induced breakdown, identifying fermion pairs and modified trajectories for quantized transport.

Keywords:
Topological matterUltracold gases

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Area of Science:

  • Condensed matter physics
  • Quantum mechanics
  • Topological matter

Background:

  • Topological invariants in quantum systems are often explained by geometric properties of wave functions.
  • Interactions can alter material topology, challenging idealized models like Bloch waves.
  • Studying topological matter with varying interactions is experimentally difficult.

Purpose of the Study:

  • To experimentally realize a topological Thouless pump with tunable Hubbard interactions.
  • To investigate the impact of interparticle interactions on topological pumping.
  • To explore methods for reinstating topological pumping under strong interactions.

Main Methods:

  • Utilizing an optical lattice to create a topological Thouless pump.
  • Implementing fully tunable Hubbard interactions (repulsive and attractive).
  • Modifying the pump trajectory to overcome interaction-induced breakdown.

Main Results:

  • Observed robust topological pumping for interactions weaker than the protecting gap.
  • Identified bound fermion pairs as crucial for quantized transport with attractive interactions.
  • Demonstrated breakdown of topological pumping with strong repulsive interactions, but showed it can be reinstated.

Conclusions:

  • Tunable Hubbard interactions in optical lattices provide a platform to study interacting topological matter.
  • Understanding interaction effects is key to realizing robust topological phenomena.
  • This work offers insights into interaction-induced topological phases and edge effects.