Regular Article - Atomic Physics
Antiferromagnet phase of a square Rydberg lattice in the ladder configuration
Center for Quantum Sciences and School of Physics, Northeast Normal University, 130024, Changchun, China
Accepted: 4 September 2021
Published online: 20 September 2021
We study the Rydberg excitation of a square atomic lattice driven by a pumping and a coupling fields into the ladder configuration via Monte Carlo simulations based on density matrix equations. Single-atom Rydberg population can be very close to unit benefiting from the formation of a dark state such that the antiferromagnet (AFM) phase has been observed at finite two-photon detunings owing to moderate van der Waals (vdW) interactions. We note in particular that the pumping Rabi frequency is more important than the coupling Rabi frequency in manipulating the AFM phase to occur for specific pumping detunings, coupling detunings, and nearest-neighbor vdW potentials. Moreover, the AFM phase may enter a saturation regime in terms of its parameter region when the boundary effect of vdW interactions is negligible for a large enough lattice size.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2021