Correlated nature of hybrid s-wave superconducting and Rashba lattices
L. Craco
DOI 10.1103/PhysRevB.104.064509 · Physical Review B
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Abstract
We elucidate the electronic state of a two-dimensional (2D) Rashba square lattice proximitized to a square monolayer s-wave superconductor, analyzing the role played by dynamical electron-electron interactions. The 2D+2D proximity effect induces sharp Bogoliubov and low-energy Andreev-reflected bound states, suppressing the s-wave gap globally. Dynamical correlations strongly renormalize the Bogoliubov quasiparticles and the Andreev levels, evolving the spin-resolved Andreev linewidths into a single bound state. We explore the channel- and spin-resolved spectral functions and analyze the reconstructed superconducting state, showing that the Rashba spin-orbit coupling drives strong channel differentiation. The mutual interplay between electron-electron and spin-orbit interactions, with proximity-induced electron pairing, lead us to introduce a generally applicable mechanism for designing Majorana fermions in 2D superconducting structures.
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