Interactions enable Thouless pumping in a nonsliding lattice

Abstract

A topological 'Thouless' pump represents the quantised motion of particles in response to a slow, cyclic modulation of external control parameters. The Thouless pump, like the quantum Hall effect, is of fundamental interest in physics because it links physically measurable quantities, such as particle currents, to geometric properties of the experimental system, which can be robust against perturbations and thus technologically useful. So far, experiments probing the interplay between topology and inter-particle interactions have remained relatively scarce. Here we observe a Thouless-type charge pump in which the particle current and its directionality inherently rely on the presence of strong interactions. Experimentally, we utilise a two-component Fermi gas in a dynamical superlattice which does not exhibit a sliding motion and remains trivial in the single-particle regime. However, when tuning interparticle interactions from zero to positive values, the system undergoes a transition from being stationary to drifting in one direction, consistent with quantised pumping in the first cycle. Remarkably, the topology of the interacting pump trajectory cannot be adiabatically connected to a non-interacting limit, highlighted by the fact that only one atom is transferred per cycle. Our experiments suggest that Thouless charge pumps are promising platforms to gain insights into interaction-driven topological transitions and topological quantum matter.

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• Thouless pumping in a driven-dissipative Kerr resonator array
• Thouless pumping and trapping of two-component gap solitons
• Transport of Vector Solitons in Spin-Dependent Nonlinear Thouless Pumps
• Anomalous pumping in the non-Hermitian Rice-Mele model
• Quantized Thouless pumps protected by interactions in dimerized Rydberg tweezer arrays
• Splitting and connecting singlets in atomic quantum circuits
• Anomalous bulk-edge correspondence of nonlinear Rice-Mele model
• Topological photon pumping in quantum optical systems
• Quasiperiodicity protects quantized transport in disordered systems without gaps
• A new pathway to impact ionization in a photo-excited one-dimensional ionic Hubbard model
• Quantum transport phenomena induced by time-dependent fields
• Topologically protected quantized changes of the distance between atoms
• Fractional Thouless pumping of solitons: a unique manifestation of bulk-edge correspondence of nonlinear eigenvalue problems
• Emergence of topological states in relaxation dynamics of interacting bosons
• Quantum theory of fractional topological pumping of lattice solitons
• Reentrant topology and reverse pumping in a quasiperiodic flux ladder
• Design and characterization of all two-dimensional fragile topological bands
• Nonreciprocity Induced Fractional Nonlinear Thouless Pumping
• Anisotropy-driven topological quantum phase transition in magnetic impurities