Interaction effects and superconductivity signatures in twisted double-bilayer WSe${}_2$

Abstract

Twisted bilayer graphene provides a new two-dimensional platform for studying electron interaction phenomena and flat band properties such as correlated insulator transition, superconductivity and ferromagnetism at certain magic angles. Here, we present strong evidence of correlated insulator states and superconductivity signatures in p-type twisted double-bilayer WSe${}_2$. Enhanced interlayer interactions are observed when the twist angle decreases to a few degrees as reflected by the high-order satellites in the electron diffraction patterns taken from the 2H/3R-stacked domains reconstructed from a conventional Moiré superlattice. In contrast to twisted bilayer graphene, there is no specific magic angle for twisted WSe${}_2$. The flat band properties are observed at twist angles ranging from 1 to 4 degrees. The highest superconducting transition temperature observed by transport measurement is 6 K. Our work has facilitated future study in the area of flat band related properties in twisted transition metal dichalcogenide layered structures.

arXiv comment10 pages, 3 figures

References in corpus (4)

• Superconductors, Orbital Magnets, and Correlated States in Magic Angle Bilayer Graphene
• Correlated states in twisted double bilayer graphene
• Giant oscillations in a triangular network of one-dimensional states in marginally twisted graphene
• Moiré quantum well states in tiny angle two dimensional semi-conductors

Cited by in corpus (8)

• Giant nonlinear Hall effect in twisted WSe${}_2$
• Phonons in Twisted Transition Metal Dichalcogenide Bilayers ("Twistnonics"): Ultra-soft Phasons, and a transition from Superlubric to Pinned Phase
• Second harmonic generation control in twisted bilayers of transition metal dichalcogenides
• Chirality induced Giant Unidirectional Magnetoresistance in Twisted Bilayer Graphene
• Tunable spin and valley excitations of correlated insulators in $\Gamma$-valley moiré bands
• Engineering Three Dimensional Moiré Flat Bands
• Determination of interatomic coupling between two-dimensional crystals using angle-resolved photoemission spectroscopy
• Topological phases in N-layer ABC-graphene boron-nitride moire superlattices