Probing Majorana fermions in spin-orbit coupled atomic Fermi gases

Abstract

We examine theoretically the visualization of Majorana fermions in a two-dimensional trapped ultracold atomic Fermi gas with spin-orbit coupling. By increasing an external Zeeman field, the trapped gas transits from non-topological to topological superfluid, via a mixed phase in which both types of superfluids coexist. We show that the zero-energy Majorana fermion, supported by the topological superfluid and localized at the vortex core, is clearly visible through (i) the core density and (ii) the local density of states, which are readily measurable in experiment. We present a realistic estimate on experimental parameters for ultracold ${}^{40}$K atoms.

4 pages, 4 figures

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• Quantum depletion and superfluid density of a supersolid in Raman spin-orbit coupled Bose gases
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• General framework for transport in spin-orbit-coupled superconducting heterostructures: Nonuniform spin-orbit coupling and spin-orbit-active interfaces
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• Coherent Manipulation of Orbital Feshbach Molecules of Two-Electron Atoms
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• Anderson localization of Cooper pairs and Majorana fermions in an ultracold atomic Fermi gas with synthetic spin-orbit coupling
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