Band-gap structure and chiral discrete solitons in optical lattices with artificial gauge fields

摘要

We study three-leg-ladder optical lattices loaded with repulsive atomicBose-Einstein condensates and subjected to artificial gauge fields. Byemploying the plane-wave analysis and variational approach, we analyze theband-gap structure of the energy spectrum and reveal the exotic swallow-tailloop structures in the energy-level anti-crossing regions due to an interplaybetween the atom-atom interaction and artificial gauge field. Also, we discoverstable discrete solitons residing in a semi-infinite gap above the highestband, these discrete solitons are associated with the chiral edge currents.