Current- and field-induced topology in twisted nodal superconductors

Abstract

We show that interlayer current induces topological superconductivity in twisted bilayers of nodal superconductors. A bulk gap opens and achieves its maximum near a ``magic'' twist angle ${\theta }_{\mathrm{MA}}$. Chiral edge modes lead to a quantized thermal Hall effect at low temperatures. Furthermore, we show that an in-plane magnetic field creates a periodic lattice of topological domains with edge modes forming low-energy bands. We predict their signatures in scanning tunneling microscopy. Estimates for candidate materials indicate that twist angles $\theta \sim {\theta }_{\mathrm{MA}}$ are optimal for observing the predicted effects.

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