van der Waals metamaterials

Abstract

The van der Waals heterostructures are a fertile frontier for discovering emergent phenomena in condensed matter systems. They are constructed by stacking elements of a large library of two-dimensional materials, which couple together through van der Waals interactions. However, the number of possible combinations within this library is staggering, and fully exploring their potential is a daunting task. Here we introduce van der Waals metamaterials to rapidly prototype and screen their quantum counterparts. These layered metamaterials are designed to reshape the flow of ultrasound to mimic electron motion. In particular, we show how to construct analogues of all stacking configurations of bilayer and trilayer graphene through the use of interlayer membranes that emulate van der Waals interactions. By changing the membrane's density and thickness, we reach coupling regimes far beyond that of conventional graphene. We anticipate that van der Waals metamaterials will explore, extend, and inform future electronic devices. Equally, they allow the transfer of useful electronic behavior to acoustic systems, such as flat bands in magic-angle twisted bilayer graphene, which may aid the development of super-resolution ultrasound imagers.

References in corpus (24)

• Van der Waals heterostructures
• Magic-angle graphene superlattices: a new platform for unconventional superconductivity
• 2D materials and van der Waals heterostructures
• Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
• Tuning superconductivity in twisted bilayer graphene
• Acoustic topological insulator and robust one-way sound transport
• The electronic properties of bilayer graphene
• Observation of phononic helical edge states in a mechanical 'topological insulator'
• Topological mechanics of gyroscopic metamaterials
• Origin of Magic Angles in Twisted Bilayer Graphene
• Atomic and electronic reconstruction at van der Waals interface in twisted bilayer graphene
• Electrical characterization of fully encapsulated ultra thin black phosphorus-based heterostructures with graphene contacts
• Electronic properties of graphene-based bilayer systems
• Do Linear Dispersions of Classical Waves Mean Dirac Cones?
• WSe2 light-emitting tunneling transistors with enhanced brightness at room temperature
• Valley Topological Phases in Bilayer Sonic Crystals
• Photonic analog of graphene model and its extension -- Dirac cone, symmetry, and edge states --
• Pressure dependence of the magic twist angle in graphene superlattices
• Relaxation of moiré patterns for slightly misaligned identical lattices: graphene on graphite
• Strong covalent bonding between two graphene layers
• Manipulation of Dirac Cones in Mechanical Graphene
• Stacking-dependent electronic structure of trilayer graphene resolved by nanospot angle-resolved photoemission spectroscopy
• Topological Phononic Logic
• Symmetry classification of energy bands in graphene

Cited by in corpus (7)

• Magic-angle Bilayer Phononic Graphene
• Chiral plasmons with twisted atomic bilayers
• Bilayer Photonic Graphene
• Acoustic twisted bilayer graphene
• Three-Dimensional Topological Twistronics
• One-Dimensional Moiré Physics and Chemistry in Heterostrained Bilayer Graphene
• Exotic quantum light-matter interactions in bilayer square lattices