Preparation and observation of anomalous counterpropagating edge states in a periodically driven optical Raman lattice

• URL: http://arxiv.org/abs/2411.13940v2
• Date: Mon, 25 Nov 2024 17:40:41 GMT
• Title: Preparation and observation of anomalous counterpropagating edge states in a periodically driven optical Raman lattice
• Authors: Hongting Hou, Long Zhang,
• Abstract summary: We prepare and detect anomalous counterpropagating edge states in a two-dimensional periodically driven optical Raman lattice. Results establish a theoretical framework for future experimental explorations of the AFVH phase and topological phenomena associated with its unique edge modes.
• Score: 3.3463067879269865
• License:
• Abstract: Motivated by the recent observation of real-space edge modes with ultracold atoms [Braun et al., Nat. Phys. 20, 1306 (2024)], we investigate the preparation and detection of anomalous counterpropagating edge states -- a defining feature of the anomalous Floquet valley-Hall (AFVH) phase -- in a two-dimensional periodically driven optical Raman lattice. Modeling the atomic cloud with a Gaussian wave packet state, we explore, both analytically and numerically, how the population of edge modes depends on the initial-state parameters. In particular, we reveal that, in addition to the internal spin state, the initial momenta parallel and perpendicular to the boundary play essential roles: they independently control the selective population of edge states across distinct momenta and within separate quasienergy gaps. Furthermore, we examine the wave-packet dynamics of counterpropagating edge states and demonstrate that their characteristic motion is robust against long-range disorder. These results establish a theoretical framework for future experimental explorations of the AFVH phase and topological phenomena associated with its unique edge modes.

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