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.

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

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• General scatterings and electronic states in the quantum-wire network of moiré systems
• Quantum Monte Carlo study of honeycomb antiferromagnets under a triaxial strain
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• Realizing One-dimensional Metallic States in Graphene via Periodically Coupled Zeroth Pseudo-Landau Levels
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• 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
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• Emergence of half-metallic ferromagnetism and valley polarization in transition metal substituted WSTe monolayer
• Anomalous Hall Effect in Thin Bismuth
• High-purity valley-polarized currents induced by bichromatic optical fields in two-dimensional materials
• Electric and chiral response to a pseudoelectric field in Weyl materials
• Superfluid Stiffness and Josephson Quantum Capacitance: Adiabatic Approach and Topological Effects
• Mode-Resolved Multiband Ballistic Transport and Conductance Thresholds in Bilayer Graphene Junctions
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• Torsional Hall Viscosity of Massive Chern Insulators: Magnetic Field and Momentum Deformations
• Sensing Strain-induced Symmetry Breaking by Reflectance Anisotropy Spectroscopy
• Pseudomagnetic fields and strain engineering: graphene on GaN nanowires
• Coupled-wire descriptions of unconventional quantum states in twisted nanostructures