Antiferromagnet phase of a square Rydberg lattice in the ladder configuration

• Published in: The European physical journal. D, Atomic, molecular, and optical physics Vol. 75; no. 9
• Main Authors: Zhai, Shang-Yu, Liu, Yi-Mou, Wu, Jin-Hui
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.09.2021; Springer Nature B.V
• Subjects: Antiferromagnetism; Applications of Nonlinear Dynamics and Chaos Theory; Atomic; Configurations; Coupling; Molecular; Optical and Plasma Physics; Physical Chemistry; Physics; Physics and Astronomy; Pumping; Quantum Information Technology; Quantum Physics; Rabi frequency; Regular Article - Atomic Physics; Spectroscopy/Spectrometry; Spintronics
• DOI: 10.1140/epjd/s10053-021-00264-8
• ISSN: 1434-6060

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.