= Cold-atom realization of the Haldane model
<Gregor Jotzu> and collaborators realized an artificial <Haldane model> in 2014. They loaded spin-polarized potassium-40 <fermions> into a laser-made <honeycomb lattice>. Piezoelectric mirrors shook the <optical lattice> along two axes; their relative phase controlled <time-reversal symmetry> breaking. Optical phase control adjusted the sublattice offset.<Experimental realisation of the topological Haldane model by Gregor Jotzu and others>[Jotzu et al., pp. 1–2, Fig. 1; Methods A–C]{ref}
A <magnetic field gradient> drove <Bloch oscillations>. Band mapping measured interband transfer to locate valley-gap closures. Opposite-force drift measurements distinguished cancelling from reinforcing <Berry curvature> contributions; reversing shaking handedness reversed the drift. Interband transfer and harmonic confinement affected this readout, including drift beyond ideal transition lines. This neutral-atom <Floquet Hamiltonian> realization did not measure electrical <sheet conductivity>. Magnetic fields were used for preparation and forcing.<Experimental realisation of the topological Haldane model by Gregor Jotzu and others>[Jotzu et al., pp. 2–4, Figs. 2–4; Methods A–C; inspected v2 revision 2018, original publication 2014]{ref}
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