title: Dark solitons with Majorana fermions in spin-orbit-coupled Fermi gases.
abstract: We show that a single dark soliton can exist in a spin-orbit-coupled Fermi gas with a high spin imbalance, where spin-orbit coupling favors uniform superfluids over nonuniform Fulde-Ferrell-Larkin-Ovchinnikov states, leading to dark soliton excitations in highly imbalanced gases. Above a critical spin imbalance, two topological Majorana fermions without interactions can coexist inside a dark soliton, paving a way for manipulating Majorana fermions through controlling solitons. At the topological transition point, the atom density contrast across the soliton suddenly vanishes, suggesting a signature for identifying topological solitons.
authors.affiliation: Department of Physics, The University of Texas at Dallas, Richardson, Texas 75080, USA.
authors.forename: Yong
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Department of Physics, The University of Texas at Dallas, Richardson, Texas 75080, USA and School of Physics and Technology, Wuhan University, Wuhan 430072, China.
authors.forename: Li
authors.initials: L
authors.lastname: Mao
authors.affiliation: International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China and Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
authors.forename: Biao
authors.initials: B
authors.lastname: Wu
authors.affiliation: Department of Physics, The University of Texas at Dallas, Richardson, Texas 75080, USA.
authors.forename: Chuanwei
authors.initials: C
authors.lastname: Zhang