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A: Fachverband Atomphysik

A 30: Ultracold Atoms I (with Q)

A 30.5: Vortrag

Donnerstag, 9. März 2017, 15:45–16:00, P 104

Robustness of Topologically Protected Edge States in Quantum Walk Experiments with Neutral Atoms — •Thorsten Groh¹, Stefan Brakhane¹, Wolfgang Alt¹, Dieter Meschede¹, Janos Karoly Asbóth², and Andrea Alberti¹ — ¹Institut für Angewandte Physik, Universität Bonn, Wegelerstraße 8, D-53115 Bonn, Germany — ²Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 49, Hungary

Discrete time quantum-walks (DTQWs) with trapped ultracold atoms offer a versatile platform for the experimental investigation of topological insulator materials. An experimental proposal based on neutral atoms in spin-dependent optical lattices to realize one- and two-dimensional discrete-time quantum walks (DTQWs) with spatial boundaries between distinct Floquet topological phases is presented.

The robustness of topologically protected edge states arising at the boundaries separating distinct topological domains is analyzed in the presence of experimentally induced decoherence. Under realistic decoherence conditions, the experimental feasibility to observe unidirectional, dissipationless transport of matter waves along topological boundaries is investigated. ^[1]

[1] T. Groh, S. Brakhane, W. Alt, D. Meschede, J. K. Asbóth, and A. Alberti, "Robustness of topologically protected edge states in quantum walk experiments with neutral atoms," Phys. Rev. A 94, 013620 (2016).