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Article Dans Une Revue Physical Review A Année : 2014

Design of laser-coupled honeycomb optical lattices supporting Chern insulators

F. Gerbier
E. Anisimovas
  • Fonction : Auteur
T. Andrijauskas
  • Fonction : Auteur

Résumé

We introduce an explicit scheme to realize Chern insulating phases employing cold atoms trapped in a state-dependent optical lattice and laser-induced tunneling processes. The scheme uses two internal states, a ground state and a long-lived excited state, respectively trapped in separate triangular and honeycomb optical lattices. A resonant laser coherently coupling the two internal states enables hopping between the two sublattices with a Peierls-like phase factor. Although laser-induced hopping by itself does not lead to topological bands with non-zero Chern numbers, we find that such bands emerge when adding an auxiliary lattice that perturbs the lattice structure, effectively turning it at low energies into a realization of the Haldane model: A two-dimensional honeycomb lattice breaking time-reversal symmetry. We investigate the parameters of the resulting tight-binding model using first-principles band structure calculations to estimate the relevant regimes for experimental implementation.

Dates et versions

hal-03740934 , version 1 (30-07-2022)

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Citer

F. Gerbier, E. Anisimovas, T. Andrijauskas, N. Goldman. Design of laser-coupled honeycomb optical lattices supporting Chern insulators. Physical Review A, 2014, 89 (1), pp.013632. ⟨10.1103/PhysRevA.89.013632⟩. ⟨hal-03740934⟩
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