Inducing Topology in Twisted Nodal Superconductors
arXiv:2401.06219 · doi:10.1103/PhysRevB.109.184507
Abstract
Twisted nodal superconductors have been shown to exhibit chiral topological superconductivity under broken time-reversal symmetry. Here we show how a time-reversal preserving topological superconductivity can be induced in nodal triplet superconductor multilayers. For a bilayer system, the application of a Josephson spin current in triplet superconductors induces a non-zero spin Chern number per node in momentum space. However, we show that stabilizing a nontrivial global invariant requires an odd number of layers. As a specific example we consider trilayers with three forms of twist: chiral, alternating and single-layer. For chiral and single-layer case, we find that a gap opening in the dispersion leads to a non-trivial topological invariant. For single layer twists, we show how this invariant is non-trivial when extended to an arbitrary odd number of layers.
arXiv comment11 pages, 6 figures
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