Topological Superfluidity of Spin-Orbit Coupled Bilayer Fermi Gases

TL;DR

This paper explores how bilayer Fermi gases with spin-orbit coupling can host multiple Majorana fermions, advancing the potential for topological quantum computation through novel topological phases influenced by inter-layer tunneling.

Contribution

It introduces a new approach to generate multiple Majorana fermions using bilayer Fermi gases with tunable inter-layer tunneling, revealing two novel topological phases.

Findings

Identification of two new topological phases in bilayer Fermi gases

Demonstration of multiple Majorana fermions in trapped systems

Influence of inter-layer tunneling on topological conditions

Abstract

Topological superfluid, new quantum matter that possesses gapless exotic excitations known as Majorana fermions, has attracted extensive attention recently. These excitations, which can encode topological qubits, could be crucial ingredients for fault-tolerant quantum computation. However, creating and manipulating multiple Majorana fermions remain an ongoing challenge. Loading a topologically protected system in multi-layer structures would be a natural and simple way to achieve this goal. Here we investigate the system of bilayer Fermi gases with spin-orbit coupling and show that the topological condition is significantly influenced by the inter-layer tunneling, yielding two novel topological phases, which support more Majorana Fermions. We demonstrate the existence of such novel topological phases and associated multiple Majorana fermions using bilayer Fermi gases trapped inside a harmonic potential. This research pave a new way for generating multiple Majorana fermions and would be a significant step towards topological quantum computation.