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TT: Fachverband Tiefe Temperaturen

TT 8: Focus Session: Emerging Phenomena in Superconducting Low Dimensional Hybrid Systems II

TT 8.9: Vortrag

Dienstag, 28. September 2021, 15:45–16:00, H7

Magic angles and current-induced topology in twisted nodal superconductors — •Pavel Volkov, Justin Wilson, and Jed Pixley — Rutgers University

We propose twisted bilayers of two-dimensional nodal superconductors as a new platform to realize topological and correlated superconducting phases. We show that the Fermi velocity of the Dirac excitations in the Bogoliubov-De Gennes quasiparticle dispersion is strongly renormalized by the interlayer hopping, vanishing at a "magic angle", where time-reversal breaking superconductivity is induced. We demonstrate that magnetic field, electric gating, and current bias can be used for versatile control of the system. In particular, an interlayer current bias opens a topological gap, with the system being characterized by a non-zero Chern number.