Chiral superconductivity with enhanced quantized Hall responses in moiré transition metal dichalcogenides

npj Quantum Materials, vol. 7

Abstract

Abstract Experimental demonstrations of tunable correlation effects in magic-angle twisted bilayer graphene have put two-dimensional moiré quantum materials at the forefront of condensed-matter research. Other twisted few-layer graphitic structures, boron-nitride, and homo- or hetero-stacks of transition metal dichalcogenides (TMDs) have further enriched the opportunities for analysis and utilization of correlations in these systems. Recent experiments within the latter material class confirmed the relevance of many-body interactions and demonstrated the importance of their extended range. Since the interaction, its range, and the filling can be tuned experimentally by twist angle, substrate engineering and gating, we here explore Fermi surface instabilities and resulting phases of matter of hetero-bilayer TMDs. Using an unbiased renormalization group approach, we establish in particular that hetero-bilayer TMDs are platforms to realize topological superconductivity with winding number $$| {{{\mathcal{N}}}}| =4$$ ∣N∣=4 . We show that this state reflects in pronounced experimental signatures, such as distinct quantum Hall features.

Authors 3

1. Michael M. Scherer corresponding

   Ruhr University Bochum · University of Cologne

   Affiliation as printed

   Institut für Theoretische Physik III, Ruhr-Universität Bochum, 44801, Bochum, Germany

   Institut für Theoretische Physik, Universität zu Köln, 50937, Cologne, Germany

2. Dante Marvin Kennes Aachen Institute for Theory of Statistical Physics

   RWTH Aachen University · Jülich Aachen Research Alliance · Max Planck Institute for the Structure and Dynamics of Matter · Center for Free-Electron Laser Science

   Affiliation as printed

   Institute for Theory of Statistical Physics, RWTH Aachen University, and JARA Fundamentals of Future Information Technology, 52056, Aachen, Germany

   Max Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser Science, Luruper Chaussee 149, 22761, Hamburg, Germany

3. Laura Classen

   Brookhaven National Laboratory · Max Planck Institute for Solid State Research

   Affiliation as printed

   Condensed Matter Physics & Materials Science Division, Brookhaven National Laboratory, Upton, NY, 11973-5000, USA

   Max Planck Institute for Solid State Research, Heisenberg Str. 1, 70569, Stuttgart, Germany