Fig. 2: Interaction-induced nonlinear edge state for the initialized in-phase population.
From: Observation of nonlinear edge states in an interacting atomic trimer array
a Atomic population in two leftmost sites Ps (red circles) and participation ratio r (blue circles) in a topological trimer array for J/K = 0.31 as a function of interaction U/K. b Population distributions in the topological trimer array with J/K = 0.31 for U/K = 0 and 4.8. c Variations of Ps (red circles) and r (blue circles) in a nontopological array for J/K = 3 with U/K. d Population distributions in the nontopological array with J/K = 3 for U/K = 0 and 4.8. The data in (a, c) are obtained after the time t = 3.2ħ/K, and the solid lines are the numerical simulations. The images in (b, d) are taken after t = 3.2ħ/K evolution and 22 ms TOF. All error bars denote standard errors. In all panels, the atoms are equally initialized at two leftmost sites with phase ϕ = 0, and the intercell hopping rate is K/h = 0.4 kHz
