Emergent Majorana Mass and Axion Couplings in Superfluids

Abstract

Axions (in the general sense) may acquire qualitatively new couplings inside superfluids. Their conventional couplings to fermions, in empty space, involve purely imaginary masses; the new couplings involve emergent Majorana masses. The possibility of weak links for axions, recently put forward, is analyzed, rejected, and replaced with a non-local analogue.

10 pages, no figures. v2: Additional comment on non-local Josephson effects, additional expository remarks

References in corpus (2)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Annihilation of colliding Bogoliubov quasiparticles reveals their Majorana nature

Cited by in corpus (4)

• Andreev-Majorana bound states in superfluids
• Effective action and electromagnetic response of topological superconductors and Majorana-mass Weyl fermions
• SQUID-based Resonant Detection of Axion Dark Matter
• Synthesis of Majorana mass terms in low-energy quantum systems