Floquet engineering topological Dirac bands
Quantum Gases
2022-08-31 v1 Quantum Physics
Abstract
We experimentally realized a time-periodically modulated 1D lattice for ultracold atoms featuring a pair of linear bands, each associated with a Floquet winding number: a topological invariant. These bands are spin-momentum locked and almost perfectly linear everywhere in the Brillouin zone (BZ), making this system a near-ideal realization of the 1D Dirac Hamiltonian. We characterized the Floquet winding number using a form of quantum state tomography, covering the BZ and following the micromotion through one Floquet period. Lastly, we altered the modulation timing to lift the topological protection, opening a gap at the Dirac point that grew in proportion to the deviation from the topological configuration.
Cite
@article{arxiv.2202.05033,
title = {Floquet engineering topological Dirac bands},
author = {Mingwu Lu and G. H. Reid and A. R. Fritsch and A. M. Piñeiro and I. B. Spielman},
journal= {arXiv preprint arXiv:2202.05033},
year = {2022}
}