Exploring the interplay between topology and nonlinearity leads to an emerging field of nonlinear topological physics,which extends the study of fascinating properties of topological states to a regime where interacti...Exploring the interplay between topology and nonlinearity leads to an emerging field of nonlinear topological physics,which extends the study of fascinating properties of topological states to a regime where interactions between the particles cannot be neglected.For ultracold atomic systems,although many exotic topological states have been recently observed,the nonlinear effect remains elusive.Here,based on the laser-driven couplings of discrete atomic momentum states,we synthesize a topological trimer array,where the atomic interactions give rise to tunable nonlinearities.We observe the formation of nonlinear edge states in the density population evolution and participation ratio with increasing interaction,in contrast to the diffusive transport in a broad interaction range in nontopological arrays.Furthermore,we show the impact of interactions on the population distribution evolved from the initialized single-site population.Our work opens the avenue for exploring emergent nonlinear topological behaviors in ultracold atomic gases.展开更多
基金supported by the Innovation Program for Quantum Science and Technology(Grant Nos.2021ZD0302103)the National Key Research and Development Program of China(Grant Nos.2022YFA1404201)+1 种基金the National Natural Science Foundation of China(Grant Nos.62325505,62422508,12474337,62175140 and 12104353)the Applied Basic Research Project of Shanxi Province(Grant No.202203021224001).
文摘Exploring the interplay between topology and nonlinearity leads to an emerging field of nonlinear topological physics,which extends the study of fascinating properties of topological states to a regime where interactions between the particles cannot be neglected.For ultracold atomic systems,although many exotic topological states have been recently observed,the nonlinear effect remains elusive.Here,based on the laser-driven couplings of discrete atomic momentum states,we synthesize a topological trimer array,where the atomic interactions give rise to tunable nonlinearities.We observe the formation of nonlinear edge states in the density population evolution and participation ratio with increasing interaction,in contrast to the diffusive transport in a broad interaction range in nontopological arrays.Furthermore,we show the impact of interactions on the population distribution evolved from the initialized single-site population.Our work opens the avenue for exploring emergent nonlinear topological behaviors in ultracold atomic gases.
