Flexible Control of Chiral Superconductivity in Optically Driven Nodal Point Superconductors with Antiferromagnetism
arxiv(2024)
摘要
Recent studies have attracted widespread attention on magnet-superconductor
hybrid systems with emergent topological superconductivity. Here, we present
the Floquet engineering of realistic two-dimensional topological nodal-point
superconductors that are composed of antiferromagnetic monolayers in proximity
to an s-wave superconductor. We show that Floquet chiral topological
superconductivity arises naturally due to light-induced breaking of the
effective time-reversal symmetry. More strikingly, we find that the Floquet
chiral topological superconducting phases can be flexibly controlled by
irradiating elliptically polarized light, with the photon-dressed quasi-energy
spectrum carrying different Chern numbers. Such optically switchable
topological transition is attributed to the simultaneous creations (or
annihilations) of valley pairs. Our findings provide a feasible approach for
achieving the Floquet chiral topological superconductivity with flexible
tunability, which would draw extensive attention in experiments.
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