Moiré Periodic and Quasiperiodic Crystals in Heterostructures of Twisted Bilayer Graphene and Hexagonal Boron Nitride

Stacking two atomic crystals with a twist between their crystal axes produces moiré potentials that modify the electronic properties. Here we show that double moiré potentials generated by superposing three atomic crystals create a new class of tunable quasiperiodic structures that alter the symmetr...

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Veröffentlicht in:arXiv.org 2024-12
Hauptverfasser: Lai, Xinyuan, Li, Guohong, Coe, Angela M, Pixley, Jedediah H, Watanabe, Kenji, Taniguchi, Takashi, Andrei, Eva Y
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Li, Guohong
Coe, Angela M
Pixley, Jedediah H
Watanabe, Kenji
Taniguchi, Takashi
Andrei, Eva Y
description Stacking two atomic crystals with a twist between their crystal axes produces moiré potentials that modify the electronic properties. Here we show that double moiré potentials generated by superposing three atomic crystals create a new class of tunable quasiperiodic structures that alter the symmetry and spatial distribution of the electronic wavefunctions. By using scanning tunneling microscopy and spectroscopy to study twisted bilayer graphene on hexagonal boron nitride (hBN), we unveil a moiré phase diagram defined by the lattice constants of the two moiré lattices (graphene-on-graphene and graphene-on-hBN), comprising both commensurate periodic and incommensurate quasiperiodic crystals. Remarkably, the 1:1 commensurate crystal, which should theoretically exist at only one point on this phase diagram, is observed over a wide range, demonstrating an unexpected self-alignment mechanism. The incommensurate crystals include quasicrystals, which are quasiperiodic and feature a Bravais-forbidden dodecagonal symmetry, and intercrystals, which are also quasiperiodic but lack forbidden symmetries. This rich variety of tunable double moiré structures offers a synthetic platform for exploring the unique electronic properties of quasiperiodic crystals, which are rarely found in nature.
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subjects Bilayers
Boron nitride
Crystal lattices
Crystal structure
Crystals
Graphene
Heterostructures
Lattice parameters
Phase diagrams
Scanning tunneling microscopy
Self alignment
Spatial distribution
Symmetry
Wave functions
title Moiré Periodic and Quasiperiodic Crystals in Heterostructures of Twisted Bilayer Graphene and Hexagonal Boron Nitride
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