Majorana fermions in few-layer NbSe$_{\mathrm{2}}$/nanowires heterostructures

Recently, the novel Ising superconductivity has been discovered in NbSe$_{\mathrm{2}}$ atomic layers with strongly enhanced in-plane upper critical fields. This arises from the strong Ising spin-orbit coupling (SOC) in NbSe$_{\mathrm{2}}$ which protects electron spins from being aligned by in-plane fields. In this work, we show that the Ising SOC generates spin-triplet Cooper pairs in superconducting few-layer NbSe$_{\mathrm{2}}$. By placing paramagnetic nanowires in proximity to superconducting NbSe$_{\mathrm{2}}$, spin-triplet pairings can be induced in the nanowires, and the system becomes a topological superconductor supporting Majorana fermions (MFs) upon application of in-plane magnetic fields. Advantages of our proposal in the experimental realization of MFs and their braiding scheme in 1D wire networks are discussed.