Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 39: Poster Magnetism II

MA 39.5: Poster

Mittwoch, 11. März 2026, 18:00–21:00, P2

Tunable Topological Spin Pump in the XXZ Chain via Incommensurate Boundary Drives. — •Anshuman Tripathi¹, Mircea Trif², and Thore Posske¹ — ¹I. Institute for Theoretical Physics, University of Hamburg, Hamburg, Germany — ²International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, Warsaw, Poland

We investigate an interacting XXZ spin-1/2 chain driven quasiadiabatically at its boundaries by two incommensurate phase drives. The independently evolving phases result in a quasi-periodic trajectory on a two-dimensional torus, which generates a robust topological spin pump in the ground state. We show that the pumped spin is determined by an effective Chern number defined over the drive-phase torus, whose value is set by the number of degeneracy points enclosed by the trajectory. These degeneracy points increase systematically with the chain length and can be tuned through the exchange anisotropy, providing direct control of the topological pumping strength. Our results demonstrate that incommensurate multi-tone driving enables a versatile and robust realization of topological pumps in interacting quantum spin chains.

Keywords: Spin pump; Adibaticity; Multifrequency drive; Floquet lattice; Spin chain