Journal
2D MATERIALS
Volume 4, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/aa6a3b
Keywords
floquet engeneering; ultracold gases; artificial graphene; topological insulators
Categories
Funding
- Adv. ERC grant OSYRIS
- EU grant QUIC (H2020-FETPROACT-2014) [641122]
- EU STREP EQuaM
- MINECO (Severo Ochoa grant) [SEV-2015-0522, FISICATEAMO FIS2016-79508-P]
- Generalitat de Catalunya [SGR 874]
- Fundacio Privada Cellex
- CERCA Program/Generalitat de Catalunya
- Cellex-ICFO-MPQ fellowship
- FRS-FNRS Belgium
- BSPO under PAI Project [P7/18 DYGEST]
- ERC Starting Grant TopoCold
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Topological band structures can be designed by subjecting lattice systems to time-periodic modulations, as was proposed for irradiated graphene, and recently demonstrated in two-dimensional (2D) ultracold gases and photonic crystals. However, changing the topological nature of Floquet Bloch bands from trivial to non-trivial, by progressively launching the time-modulation, is necessarily accompanied with gap-closing processes: this has important consequences for the loading of particles into a target Floquet band with non-trivial topology, and hence, on the subsequent measurements. In this work, we analyse how such loading sequences can be optimized in view of probing the topology of 2D Floquet bands through transport measurements. In particular, we demonstrate the robustness of center-of-mass responses, as compared to current responses, which present important irregularities due to an interplay between the micro-motion of the drive and inter-band interference effects. The results presented in this work illustrate how probing the center-of-mass displacement of atomic clouds offers a reliable method to detect the topology of Floquet bands, after realistic loading sequences.
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