Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 31: Ultracold Matter IV – Bosons, Rydberg Systems, and Others (joint session Q/A)
Q 31.7: Talk
Wednesday, March 4, 2026, 16:00–16:15, P 2
An autonomous Thouless Pump — •Julius Bohm1, James Anglin1, and Michael Fleischhauer1,2 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Research Center QC-AI, University of Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
The Thouless pump is a paradigmatic example for a dynamical topological process in non-interacting 1+1-dimensional lattice systems [1]. Cyclic variation of lattice parameters can lead to quantized transport of particles in that lattice protected by a topological invariant. By now theoretical as well as experimental approaches for these pumps rely on direct modulation of the lattice parameters in time. Recent experiments [2] have shown, that replacing the lattice parameter by dynamical quantum degrees of freedom can lead to self-sustained topological pumps. We here present a theoretical model, where a single spin controlling the lattice particles and being subject to a constant magnetic field "drives" the system into a pumping phase without explicit time-dependencies. This pumping phase represents a non-equilibrium topological phase in excited eigenstates of the interacting system. We numerically determine the phase diagram of the system with parameter regions of quantized topological transport in the excited eigenstate and trivial phases without quantized transport. We derive analytic approximations for the corresponding critical parameters and introduce a topological invariant governing the topological transport.
[1] D. J. Thouless, Phys. Rev. B 27, 6083 (1983) [2] D. Dreon, et al., Nature 608, 494-498 (2022)
Keywords: Topology; Thouless pump; 1-dimensional; time-independent