Real-space detection and manipulation of topological edge modes with ultracold atoms

Abstract

Conventional topological insulators exhibit exotic gapless edge or surface states, as a result of non-trivial bulk topological properties. In periodically-driven systems the bulk-boundary correspondence is fundamentally modified and knowledge about conventional bulk topological invariants is insufficient. While ultracold atoms provide excellent settings for clean realizations of Floquet protocols, the observation of real-space edge modes has so far remained elusive. Here we demonstrate an experimental protocol for realizing chiral edge modes in optical lattices, by creating a topological interface using a potential step that is generated with a programmable optical potential. We show how to efficiently prepare particles in these edge modes in three distinct Floquet topological regimes that are realized in a periodically-driven honeycomb lattice. Controlling the height and sharpness of the potential step, we study how edge modes emerge at the interface and how the group velocity of the particles is modified as the sharpness of the potential step is varied.

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Cited by in corpus (21)

• Non-Hermitian Skin Effect in Periodically-Driven Dissipative Ultracold Atoms
• Probing non-equilibrium topological order on a quantum processor
• Observation of chiral edge transport in a rapidly-rotating quantum gas
• Chiral polaron formation on the edge of topological quantum matter
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• Floquet Flux Attachment in Cold Atomic Systems
• Floquet-engineered Emergent Massive Nambu-Goldstone Modes
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• Proposal for realizing unpaired Weyl points in a three-dimensional periodically driven optical Raman lattice
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• Anomalous wave-packet transport on boundaries of Floquet topological systems
• Breakdown of Non-Bloch Bulk-Boundary Correspondence and Emergent Topology in Floquet Non-Hermitian Systems
• Discrete time crystals detected by time-translation twist
• Design and characterization of all two-dimensional fragile topological bands
• Fractionalized Prethermalization in the One-Dimensional Hubbard Model
• Dynamics of transport by helical edge states
• Preparation and observation of anomalous counterpropagating edge states in a periodically driven optical Raman lattice
• Ultracold atomic lattice systems for simulating topological phases: A review
• Quantum Hall edges beyond the plasma analogy