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Q: Fachverband Quantenoptik und Photonik

Q 52: Floquet Engineering and Topology

Q 52.2: Vortrag

Donnerstag, 9. März 2023, 15:00–15:15, E001

Preparing and probing bosonic Chern-insulator analogs using Mott states or disorder — •Isaac Tesfaye¹, Botao Wang², and André Eckardt¹ — ¹Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany — ²Université Libre de Bruxelles

Mimicking fermionic Chern insulators with bosons has drawn a lot of interest in experiments by using, for example, cold atoms [1,2] or photons [3]. Here we present a scheme to prepare and probe a bosonic Chern insulator analog by using (a) an ensemble of randomized bosonic states and (b) an initial Mott state configuration. By applying a staggered superlattice, we can identify the lowest band with individual lattice sites. The delocalization over this band in quasimomentum space is then achieved by introducing on-site disorder or local random phases (a). Switching off the interactions and adiabatically decreasing the superlattice then gives rise to a bosonic Chern insulator, whose topologically non-trivial property is further confirmed from the Laughlin-type quantized charge pumping. Adding to this, we propose a detection scheme allowing for the observation of the bosonic quantized charge pump using a feasible number of experimental snapshots. Our protocol provides a useful tool to realize and probe topological states of matter in quantum gases or photonic systems.

[1] M. Aidelsburger, M. Lohse, C. Schweizer, et al., Nature Physics 11, 162 (2015), [2] N. R. Cooper, J. Dalibard, and I. B. Spielman, Rev. Mod. Phys. 91, 015005 (2019), [3] T. Ozawa, H. M. Price, A. Amo, et al., Rev. Mod. Phys. 91, 015006 (2019).