From Nodal Ring Topological Superfluids to Spiral Majorana Modes in Cold Atomic Systems

Abstract

In this work, we consider a 3D cubic optical lattice composed of coupled 1D wires with 1D spin-orbit coupling. When the s-wave pairing is induced through Feshbach resonance, the system becomes a topological superfluid with ring nodes, which are the ring nodal degeneracies in the bulk, and supports a large number of surface Majorana zero energy modes. The large number of surface Majorana modes remain at zero energy even in the presence of disorder due to the protection from a chiral symmetry. When the chiral symmetry is broken, the system becomes a Weyl topological superfluid with Majorana arcs. With 3D spin-orbit coupling, the Weyl superfluid becomes a novel gapless phase with spiral Majorana modes on the surface. The spatial resolved radio frequency spectroscopy is suggested to detect this novel nodal ring topological superfluid phase.

5 pages, 4 figures. Comments are welcome

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Cited by in corpus (4)

• Observation of nodal-line semimetal with ultracold fermions in an optical lattice
• Topological Gapless Matters in Three-dimensional Ultracold Atomic Gases
• Topological nodal chains in optical lattices
• Dynamic structure factors of a strongly interacting Fermi superfluid near an orbital Feshbach resonance across the phase transition from BCS to Sarma superfluid