Nanoscale Strain Engineering of Giant Pseudo-Magnetic Fields, Valley Polarization and Topological Channels in Graphene

Abstract

The existence of nontrivial Berry phases associated with two inequivalent valleys in graphene provides interesting opportunities for investigating the valley-projected topological states. Examples of such studies include observation of anomalous quantum Hall effect in monolayer graphene, demonstration of topological zero modes in molecular graphene assembled by scanning tunneling microscopy, and detection of topological valley transport either in graphene superlattices or at bilayer graphene domain walls. However, all aforementioned experiments involved non-scalable approaches of either mechanically exfoliated flakes or atom-by-atom constructions. Here we report an approach to manipulating the topological states in monolayer graphene via nanoscale strain engineering at room temperature. By placing strain-free monolayer graphene on architected nanostructures to induce global inversion symmetry breaking, we demonstrate the development of giant pseudo-magnetic fields (up to 800 Tesla), valley polarization, and periodic one-dimensional topological channels for protected propagation of chiral modes in strained graphene, thus paving a pathway towards scalable graphene-based valleytronics.

arXiv commentManuscript (5 Figures, 14 pages) and Supplementary Material (9 Figures, 11 pages), published in Science Advances

References in corpus (28)

• The electronic properties of graphene
• Topological Insulators
• Experimental Observation of Quantum Hall Effect and Berry's Phase in Graphene
• Magic-angle graphene superlattices: a new platform for unconventional superconductivity
• 2D materials and van der Waals heterostructures
• Berry Phase Effects on Electronic Properties
• Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
• Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
• Control of valley polarization in monolayer MoS2 by optical helicity
• Moire bands in twisted double-layer graphene
• Energy gaps, topological insulator state and zero-field quantum Hall effect in graphene by strain engineering
• The quantum spin Hall effect and topological insulators
• Detecting Topological Currents in Graphene Superlattices
• Valley Chern Numbers and Boundary Modes in Gapped Bilayer Graphene
• Midgap states and charge inhomogeneities in corrugated graphene
• Symmetry-based approach to electron-phonon interactions in graphene
• Single-step deposition of high-mobility graphene at reduced temperatures
• Visualizing Strain-induced Pseudo magnetic Fields in Graphene through an hBN Magnifying Glass
• Strain superlattices and macroscale suspension of Graphene induced by corrugated substrates
• Evidence for Strain-Induced Local Conductance Modulations in Single-Layer Graphene on SiO2
• Introducing Nonuniform Strain to Graphene Using Dielectric Nanopillars
• Strain Modulation of Graphene by Nanoscale Substrate Curvatures: A Molecular View
• Graphene on boron-nitride: Moiré pattern in the van der Waals energy
• Strain-induced pseudo-magnetic fields and charging effects on CVD-grown graphene
• A Tight Binding Approach to Strain and Curvature in Monolayer Transition-Metal Dichalcogenides
• Pseudo-magnetic catalysis of the time-reversal symmetry breaking in graphene
• Nano-scale strain engineering of graphene and graphene-based devices
• Strain induced superconducting pair-density-wave states in graphene

Cited by in corpus (41)

• Pseudo-magnetic field-induced ultra-slow carrier dynamics in periodically strained graphene
• Band flattening in buckled monolayer graphene
• Detection of graphene's divergent orbital diamagnetism at the Dirac point
• Topological flat bands in strained graphene: substrate engineering and optical control
• Axial Magnetoelectric Effect in Dirac semimetals
• Strain-induced pseudo-magnetic field in $\alpha -{\mathcal{T}}_3$ lattice
• Valley filtering in strain-induced $\alpha$-${\mathcal{T}}_3$ quantum dots
• Acoustoelectric effect in two-dimensional Dirac materials exposed to Rayleigh surface acoustic waves
• Origami-controlled strain engineering of tunable flat bands and correlated states in folded graphene
• Giant periodic pseudo-magnetic fields in strained kagome magnet FeSn epitaxial films on SrTiO${}_3$(111) substrate
• General scatterings and electronic states in the quantum-wire network of moiré systems
• Quantum Monte Carlo study of honeycomb antiferromagnets under a triaxial strain
• Realizing One-dimensional Metallic States in Graphene via Periodically Coupled Zeroth Pseudo-Landau Levels
• A strain-engineered graphene qubit in a nanobubble
• Electrically tunable correlated domain wall network in twisted bilayer graphene
• Generating coherent phonon waves in narrow-band materials: a twisted bilayer graphene phaser
• Quantum Nanophotonics with Energetic Particles:X-rays and Free Electrons
• Triaxially strained suspended graphene for large-area pseudo-magnetic fields
• Engineering the strain and interlayer excitons of 2D materials via lithographically engraved hexagonal boron nitride
• Effectuating tunable valley selection via multi-terminal monolayer graphene devices
• Time-dependent strain-tuning topological magnon phase transition
• Elastic Screening of Pseudogauge Fields in Graphene
• Limits of Lateral Expansion in Two-Dimensional Materials with Line Defects
• Creation and control of valley currents in graphene by few cycle light pulses
• Pseudo-magnetic fields in square lattices
• Origins of Valley Current Reversal in Partially Overlapped Graphene Layers
• Topological Superfluid Responses of Superconducting Dirac Semimetals
• Electric and chiral response to a pseudoelectric field in Weyl materials
• High-purity valley-polarized currents induced by bichromatic optical fields in two-dimensional materials
• Anomalous Hall Effect in Thin Bismuth
• Emergence of half-metallic ferromagnetism and valley polarization in transition metal substituted WSTe monolayer
• Tunnel Valley Current Filter in the Partially Overlapped Graphene under the Vertical Electric Field
• Theory of the Strain Engineering of Graphene Nanoconstrictions
• Superfluid Stiffness and Josephson Quantum Capacitance: Adiabatic Approach and Topological Effects
• Electron localization in periodically strained graphene
• Torsional Hall Viscosity of Massive Chern Insulators: Magnetic Field and Momentum Deformations
• Coupled-wire descriptions of unconventional quantum states in twisted nanostructures
• Sensing Strain-induced Symmetry Breaking by Reflectance Anisotropy Spectroscopy
• Quantum-Hall Spectroscopy of Elliptically Deformed Graphene Nanobubble Qubits
• Pseudomagnetic fields and strain engineering: graphene on GaN nanowires
• Mode-Resolved Multiband Ballistic Transport and Conductance Thresholds in Bilayer Graphene Junctions