Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.130404
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Funding
- ARO [W911NF-12-1-0334]
- AFOSR [FA9550-13-1-0045]
- NSF-PHY [1249293]
- NSF of China [11344009, 11274024, 11334001]
- NBRP of China [2013CB921903, 2012CB921300]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1249293] Funding Source: National Science Foundation
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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.
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