Freiburg 2024 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
A: Fachverband Atomphysik
A 24: Fermionic Quantum Gases II (joint session Q/A)
A 24.7: Vortrag
Mittwoch, 13. März 2024, 16:00–16:15, Aula
Topological pumping induced by interactions — konrad viebahn1, anne-sophie walter1, eric bertok2, •zijie zhu1, marius gächter1, armando a. aligia3, fabian heidrich-meisner2, and tilman esslinger1 — 1Institute for Quantum Electronics & Quantum Center, ETH Zurich, 8093 Zurich, Switzerland — 2Institute for Theoretical Physics, Georg-August-Universität Göttingen, 37077 Göttingen, Germany — 3Instituto de Nanociencia y Nanotecnologia CNEA-CONICET, Centro Atomico Bariloche and Instituto Balseiro, 8400 Bariloche, Argentina
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 because it links physically measurable quantities, such as particle currents, to geometric properties which can be robust against perturbations and thus technologically useful. 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 fermionic atoms in a dynamical superlattice which traces a pump trajectory that remains trivial in the non-interacting limit. Remarkably, the transferred charge in the interacting system is half of its usual value in the non-interacting case, in agreement with matrix-product-state simulations. Our experiments suggest that Thouless charge pumps are promising platforms to gain insights into interaction-driven topological transitions and topological quantum matter.
Keywords: topology; strongly correlated quantum matter; synthetic gauge fields; Fermi-Hubbard model; Thouless pump