1 research outputs found
Inverse proximity effect in semiconductor Majorana nanowires
We study the influence of the inverse proximity effect on the
superconductivity nucleation in hybrid structures consisting of the
semiconducting nanowires placed in contact with a thin superconducting film and
discuss the resulting restrictions on the operation of Majorana-based devices.
A strong paramagnetic effect for electrons entering the semiconductor together
with spin-orbit coupling and van Hove singularities in the electronic density
of states in the wire are responsible for the suppression of superconducting
correlations in the low field domain and for the reentrant superconductivity at
high magnetic fields in the topologically nontrivial regime. The growth of the
critical temperature in the latter case continues up to the upper critical
field destroying the pairing inside the superconducting film due to either
orbital or paramagnetic mechanism. The suppression of the homogeneous
superconducting state near the boundary between the topological and
non-topological regimes provides the conditions favorable for the
Fulde-Ferrel-Larkin-Ovchinnikov instability.Comment: 19 pages, 4 figures, 31 references, accepted to Beilstein Journal of
Nanotechnology. Thematic Series on "Topological Materials