Hannover 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 36: Quantum Gases: Bosons IV
Q 36.4: Vortrag
Mittwoch, 2. März 2016, 15:15–15:30, e001
Reservoir induced topological order and quantized charge pumps in open lattice models with interactions — •Dominik Linzner1, Malte Koster1, Fabian Grusdt2, and Michael Fleischhauer1 — 1Fachbereich Physik und Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Deutschland — 2Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
Since the discovery of the quantum Hall effect, topological states of matter have attracted the attention of scientists in many fields of physics. By now there is a rather good understanding of topological order in closed, non-interacting systems. In contrast the extension to open systems in particular with interactions is entirely in its infancy. Recently there have been advances in characterizing topology in reservoir driven systems without interactions [1], but the topological invariants introduced lack a clear physical interpretation and are restricted to non-interacting systems. We consider a one-dimensional interacting topological system whose dynamics is entirely driven by reservoir couplings. By slowly tuning these couplings periodically in time we realize an open-system analogue of the Thouless charge pump [2] that proves to be robust against unitary and non-unitary perturbations. Making use of this Thouless pump we introduce a topological invariant, which has a clear physical meaning and is applicable to interacting systems.
[1]C.E. Bardyn, et al., New J. Phys. 15, 085001 (2013)
[2]D. J. Thouless, Phys. Rev. B 27, 6083 (1983)