Erlangen 2022 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 19: Ultra-cold atoms, ions and BEC I (joint session A/Q)

Q 19.4: Vortrag

Dienstag, 15. März 2022, 11:15–11:30, A-H2

Adiabatic charge pumping in bosonic Chern insulator analogs — •Isaac Tesfaye, Botao Wang, and André Eckardt — TU Berlin, Institut für Theoretische Physik, Hardenbergstr. 36, 10623 Berlin, Deutschland

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 an ensemble of randomized bosonic states.
By applying a staggered superlattice, we identify the lowest band with individual lattice sites. The delocalization over this band in quasi-momentum space is then achieved by introducing on-site disorder or local random phases.
Adiabatically turning off the superlattice then gives rise to a bosonic Chen insulator, whose topologically non-trivial property is further confirmed from the Laughlin-type quantized charge pumping.
Our protocol may provide a useful tool to realize and probe topological states of matter in quantum gases or photonic waveguides.

[1] Aidelsburger, Monika, et al. "Measuring the Chern number of Hofstadter bands with ultracold bosonic atoms." Nature Physics 11.2 (2015): 162-166.

[2] Cooper, N. R., J. Dalibard, and I. B. Spielman. "Topological bands for ultracold atoms." Reviews of modern physics 91.1 (2019): 015005.

[3] Ozawa,Tomoki, et. al. "Topological photonics." Rev. of Mod. Phys. 91.1 (2019): 015006