Current- and Field-Induced Topology in Twisted Nodal Superconductors

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 θ_{MA}. Chiral edge modes lead to a quantized thermal Hall effect at low temperatures. Furthermore, we sh...

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Bibliographic Details
Published in:Physical review letters 2023-05, Vol.130 (18), p.186001-186001, Article 186001
Main Authors: Volkov, Pavel A, Wilson, Justin H, Lucht, Kevin P, Pixley, J H
Format: Article
Language:English
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Summary: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 θ_{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 θ∼θ_{MA} are optimal for observing the predicted effects.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.130.186001