Quantized valley Hall response from local bulk density variations
arXiv:2212.14054 · doi:10.1038/s42005-023-01377-9
Abstract
The application of a mechanical strain to a 2D material can create pseudo-magnetic fields and lead to a quantized valley Hall effect. However, measuring valley-resolved effects remains a challenging task due to their inherent fragility and dependence on the sample's proper design. Additionally, non-local transport probes based on multiterminal devices have often proven to be inadequate in yielding conclusive evidence of the valley Hall signal. Here, we introduce an alternative way of detecting the quantized valley Hall effect, which entirely relies on local density measurements, performed deep in the bulk of the sample. The resulting quantized signal is a genuine Fermi sea response, independent of the edge physics, and reflects the underlying valley Hall effect through the Widom-Středa formula. Specifically, our approach is based on measuring the variation of the particle density, locally in the bulk, upon varying the strength of the applied strain. This approach to the quantized valley Hall effect is particularly well suited for experiments based on synthetic lattices, where the particle density (or integrated density of states) can be spatially resolved.
arXiv comment17 pages, 12 figures
References in corpus (58)
- The electronic properties of graphene
- Valley contrasting physics in graphene: magnetic moment and topological transport
- Energy gaps, topological insulator state and zero-field quantum Hall effect in graphene by strain engineering
- The Valley Hall Effect in MoS2 Transistors
- Valley filter and valley valve in graphene
- A quantum gas microscope - detecting single atoms in a Hubbard regime optical lattice
- Single-Atom Resolved Fluorescence Imaging of an Atomic Mott Insulator
- Electronic Properties of Graphene in a Strong Magnetic Field
- Quantum Phases of Matter on a 256-Atom Programmable Quantum Simulator
- An atom-by-atom assembler of defect-free arbitrary 2d atomic arrays
- Detecting Topological Currents in Graphene Superlattices
- Berry phase correction to electron density of states in solids
- Electrical control of the valley Hall effect in bilayer MoS2 transistors
- Generation and detection of pure valley current by electrically induced Berry curvature in bilayer graphene
- Strain-induced pseudomagnetic field and Landau levels in photonic structures
- Artificial graphene as a tunable Dirac material
- Single-atom imaging of fermions in a quantum-gas microscope
- Experimental realization and characterization of an electronic Lieb lattice
- A Quantum Gas Microscope for Fermionic Atoms
- Gate-tunable Topological Valley Transport in Bilayer Graphene
- Site-resolved Imaging of Fermionic Lithium-6 in an Optical Lattice
- Topological states in engineered atomic lattices
- Mapping topological order in coordinate space
- Strain-induced pseudo-magnetic field for novel graphene electronics
- Giant Nonlocality near the Dirac Point in Graphene
- Robust zero-energy modes in an electronic higher-order topological insulator: the dimerized Kagome lattice
- Microscopic Observation of Pauli Blocking in Degenerate Fermionic Lattice Gases
- Designer quantum states of matter created atom-by-atom
- Realization of a fractional quantum Hall state with ultracold atoms
- Observation of acoustic Landau quantization and quantum-Hall-like edge states
- Pseudomagnetic fields for sound at the nanoscale
- Sonic Landau-level lasing and synthetic gauge fields in mechanical metamaterials
- Edge currents shunt the insulating bulk in gapped graphene
- Trapped Fermi Gases in Rotating Optical Lattices: Realization and Detection of the Topological Hofstadter Insulator
- Enhanced atom-by-atom assembly of arbitrary tweezers arrays
- Crossover from quantum to Boltzmann transport in graphene
- Tunable and giant valley-selective Hall effect in gapped bilayer graphene
- A Fermi-Hubbard Optical Tweezer Array
- Direct observation of photonic Landau levels and helical edge states in strained honeycomb lattices
- Coherent control of quantum topological states of light in Fock-state lattices
- Effect of short- and long-range scattering in the conductivity of graphene: Boltzmann approach vs tight-binding calculations
- Magnetoresistance in Disordered Graphene: The Role of Pseudospin and Dimensionality Effects Unraveled
- Preparation of hundreds of microscopic atomic ensembles in optical tweezer arrays
- Long-range nontopological edge currents in charge-neutral graphene
- Valley-Polarized Quantum Transport Generated by Gauge Fields in Graphene
- p Orbital flat band and Dirac cone in the electronic honeycomb lattice
- Observation of supersymmetric pseudo-Landau levels in strained microwave graphene
- Dispersive Landau levels and valley currents in strained graphene nanoribbons
- Edge-dependent topology in Kekulé lattices
- Fractional Chern insulators of few bosons in a box: Hall plateaus from center-of-mass drifts and density profiles
- How to directly observe Landau levels in driven-dissipative strained honeycomb lattices
- Propagating edge states in strained honeycomb lattices
- Valley Hall Effect and Non-Local Resistance in Locally Gapped Graphene
- Simulating Dirac fermions with Abelian and non-Abelian gauge fields in optical lattices
- Valley currents and non-local resistances of graphene nanostructures with broken inversion symmetry from the perspective of scattering theory
- Strain and pseudo-magnetic fields in optical lattices from density-assisted tunneling
- Landau Levels in Strained Optical Lattices
- Topological phonons in arrays of ultracold dipolar particles