Occupation-selective topological pumping from Floquet gauge fields

• URL: http://arxiv.org/abs/2603.23307v1
• Date: Tue, 24 Mar 2026 15:12:57 GMT
• Title: Occupation-selective topological pumping from Floquet gauge fields
• Abstract summary: We show that promoting tunneling to a dynamical variable leads to occupation-selective topological pumping.<n>A Floquet realization with ultracold atoms is proposed to realize such occupation-selective pumping.
• Score: 9.92670988128605
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Topological pumping is conventionally governed by single-particle band topology. Here we show that promoting tunneling to a dynamical, occupation-conditioned variable fundamentally reshapes this paradigm, leading to occupation-selective topological pumping. In a periodically driven one-dimensional superlattice with density-dependent hopping, two-body bound states (doublons) acquire Chern numbers distinct from those of single particles and exhibit quantized transport even when the single-particle pump is trivial, including counter-propagating responses. We identify a dynamical-gauge-field mechanism that induces topological phase transitions in the bound-state sector absent from the single-particle spectrum. Furthermore, the gauge field concentrates Berry curvature into sharply localized resonant regions without compromising adiabatic quantization. A Floquet realization with ultracold atoms is proposed to realize such occupation-selective pumping. Our results reveal a mechanism for occupation-selective topological responses that can persist across higher-occupancy bound states.

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