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Multiband Fractional Thouless Pumps.

Marius Jürgensen1,2, Jacob Steiner3, Gil Refael3

  • 1The Pennsylvania State University, Department of Physics, University Park, Pennsylvania 16802, USA.

Physical Review Letters
|October 31, 2025
PubMed
Summary
This summary is machine-generated.

Repulsive interactions can induce a transition in Thouless pumps, shifting from integer to fractional quantization. This occurs by stabilizing multiband Wannier states with fractional winding, a phenomenon observed in few-particle systems.

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Area of Science:

  • Condensed matter physics
  • Topological physics
  • Quantum mechanics

Background:

  • Quantization of particle transport is fundamental to topological physics.
  • Thouless pumps, simplified integer quantum Hall effect models, exhibit quantization governed by single-band Wannier state winding.

Purpose of the Study:

  • To investigate the effect of repulsive interactions on Thouless pump quantization.
  • To explore the possibility of achieving fractional quantization in Thouless pumps.

Main Methods:

  • Numerical simulations of few-particle systems.
  • Application of a dynamical Hartree-Fock ansatz.

Main Results:

  • Repulsive interactions drive a transition from integer to fractional quantization in Thouless pumps.
  • Stabilization of multiband Wannier states with fractional winding.
  • The dynamical Hartree-Fock ansatz accurately reproduces the pumping phase diagram.

Conclusions:

  • Repulsive interactions offer a mechanism to realize fractional-quantized Thouless pumps.
  • Multiband Wannier states with fractional winding are key to this transition.
  • The used theoretical framework is capable of describing these interacting topological systems.