Periodic driving induced helical Floquet channels with ultracold atoms in momentum space Teng Xiao, Dizhou Xie, Wei Gou, Tao Chen, Tian-Shu Deng, Wei Yi and Bo Yan Eur. Phys. J. D, 74 7 (2020) 152 Published online: 07 July 2020 DOI: 10.1140/epjd/e2020-10019-6