Majorana soliton predicted
Topological superfluids are recently discovered quantum matters that host topologically protected gapless edge states known as Majorana fermions – exotic quantum particles that act as their own anti-particles and obey nontrivial non-Abelian statistics. Their realisations are widely known to lie at the heart of future technologies such as fault-tolerant quantum computation. While the properties of Majorana fermions at rest are understood to some extent, their fate (i.e., existence) in the case of traveling is not known.
In a recent theoretical work, CQOS theorists, together with Professor Joachim Brand from Massey University, addressed the stability of Majorana fermions hosted by a moving soliton in one- or two-dimensional spin-orbit coupled ultracold Fermi superfluids in the topologically non-trivial regime. Time-dependent simulations reveal a universal constant pi phase jump across the soliton, irrespective of the velocity of travel. Correspondingly, Majorana fermions at the soliton core survive up to a threshold velocity, which is smaller than the Landau critical velocity. These unusual properties of the moving soliton in topological fermionic superfluids (referred to as Majorana soliton in the work) may open a new way to manipulate Majorana fermions for fault-tolerant topological quantum computations.
This work has been published in Physical Review Letters.
Link to papers:
Peng Zou et al., Phys. Rev. Lett. 117, 225302 (2016).