Experimental observation of Weyl points
arXiv:1502.03438 · doi:10.1126/science.aaa9273
Abstract
In 1929, Hermann Weyl derived the massless solutions from the Dirac equation - the relativistic wave equation for electrons. Neutrinos were thought, for decades, to be Weyl fermions until the discovery of the neutrino mass. Moreover, it has been suggested that low energy excitations in condensed matter can be the solutions to the Weyl Hamiltonian. Recently, photons have also been proposed to emerge as Weyl particles inside photonic crystals. In all cases, two linear dispersion bands in the three-dimensional (3D) momentum space intersect at a single degenerate point - the Weyl point. Remarkably, these Weyl points are monopoles of Berry flux with topological charges defined by the Chern numbers. These topological invariants enable materials containing Weyl points to exhibit a wide variety of novel phenomena including surface Fermi arcs, chiral anomaly, negative magnetoresistance, nonlocal transport, quantum anomalous Hall effect, unconventional superconductivity[15] and others [16, 17]. Nevertheless, Weyl points are yet to be experimentally observed in nature. In this work, we report on precisely such an observation in an inversion-breaking 3D double-gyroid photonic crystal without breaking time-reversal symmetry.
4 pages, 3 figures
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- A strongly robust Weyl fermion semimetal state in TaS
- Acoustic semimetal with Weyl points and surface states
- High Chern number topological superfluids and new class of topological phase transitions of Rashba spin-orbit coupled fermions on a lattice
- Functional renormalization group approach to interacting three-dimensional Weyl semimetals
- Topological characteristics of gap closing points in nonlinear Weyl semimetals
- Five-dimensional Floquet topological semimetals with emergent Yang monopoles and linked Weyl surfaces
- Effective Spin-2 Quasi-particles at Linear Dispersive Five-fold Degenerate Points with Tunable Topological Chern Numbers
- Near-field imaging of spin-locked edge states in all-dielectric topological metasurfaces
- Transition from nodal loop to nodal chain phase in a periodically modulated optical lattice
- Generating Weyl semimetals from alkali metals
- Chiral anomaly in Weyl systems: no violation of classical conservation laws
- Neutron scattering off Weyl semimetals
- Observation of surface states derived from topological Fermi arcs in the Weyl semimetal NbP
- Detect Axial Gauge Fields with a Calorimeter
- Topological Signatures in Nodal Semimetals through Neutron Scattering
- Topological transitions of spin-excitations in insulating chiral antiferromagnets
- Fabry-Perot interferometry in Weyl semi-metals
- Noncentrosymmetric two-dimensional Weyl semimetals in porous Si/Ge structures
- Quantum Topological Boundary States in Quasi-crystal
- Bose-Einstein condensate of Dirac magnons: Pumping and collective modes
- Electronic scattering, focusing, and resonance by a spherical barrier in Weyl semimetals
- Speed-of-light pulses in a nonlinear Weyl equation
- Tilted Dirac Fermions
- Weyl systems: anomalous transport normally explained
- Design triple points, nexus points and related topological phases by stacking monolayers
- Relativistic horizon of interacting Weyl fermions in condensed matter systems
- Electron scattering by magnetic impurity in Weyl semimetals
- Microcavity polaritons for topological photonics
- Weyl semimetal in ultra-thin film of topological insulator multilayer
- Unconventional transport properties in systems with triply degenerate quadratic band crossings
- Symmetry-enforced three-dimensional Dirac phononic crystals
- Robust Weyl points in a 1D superlattice with transverse spin-orbit coupling
- Optical Black-hole Analog Created by Topological Phase Transition with a Long-lived Horizon
- Simulation of nodal-line semimetal in amplitude-shaken optical lattices
- Synthesis of Majorana mass terms in low-energy quantum systems
- Geometric transport signatures of strained multi-Weyl semimetals
- Wave Topology in Hall MHD
- Unconventional Weyl exceptional contours in non-Hermitian photonic continua
- Topological insulators and geometry of vector bundles
- 3D Topological Nodes in Nonsymmorphic Photonic Crystals: Ultrastrong Coupling and Anomalous Refraction
- Observation of nearly identical superconducting transition temperatures in pressurized Weyl semimetal MIrTe4 (M=Nb and Ta)
- A semiclassical approach to surface Fermi arcs in Weyl semimetals
- Chiral magnetic conductivity and surface states of Weyl semimetals in topological insulator ultra-thin film multilayer
- Realization of multiple topological states and topological phase transitions in (4,0) carbon nanotube derivatives
- Theory of Topological Superconductivity in Doped IV-VI Semiconductors
- Monopole Field Textures in Interacting Spin Systems
- Shot noise in NS junctions with Weyl superconductor
- Quantum Hall effect and optical magneto-conductivity of two-dimensional topological nodal-line semimetals
- Magneto tunnel conductance across twisted Weyl semimetal junctions
- Global phase diagram of Coulomb-interacting anisotropic Weyl semimetals with disorder
- Magnetic Susceptibility of Dirac Fermions, Bi-Sb Alloys, Interacting Bloch Fermions, Dilute Nonmagnetic Alloys, and Kondo Alloys
- Emergent Weyl-like points in periodically modulated systems
- Proposal for realizing unpaired Weyl points in a three-dimensional periodically driven optical Raman lattice
- A novel device for controlling the flow of information based on Weyl fermions and some interesting remarks regarding the electromagnetic interactions of high energy particles
- Fermi Arcs in Tilted Weyl Semimetals: Classification, Evolution and Transport Properties
- Realization of Photonic Charge-2 Dirac Point by Engineering Super-modes in Topological Superlattices
- Three-Dimensional Quantum Hall Effect in Topological Amorphous Metals
- Topological quantum slinky motion in resonant extended Bose-Hubbard model
- Quantized Berry winding from an emergent symmetry
- Topological excitations in quasi two-dimensional quantum magnets with weak interlayer interactions
- Spin-orbit-driven quarter semimetals in rhombohedral graphene
- Berry Phase Enforced Spinor Pairing Order
- Josephson and persistent currents in a quantum ring between topological superconductors
- Topological Numbers and the Weyl Semimetal
- Advances in Synthetic Gauge Fields for Light Through Dynamic Modulation
- Topological Weyl-like Phonons and Nodal Line Phonons in Graphene
- Observation of Quadratic (Charge-2) Weyl Point Splitting in Near-Infrared Photonic Crystals
- Design and characterization of all two-dimensional fragile topological bands
- Theory of classical electrodynamics with topologically quantized singularities as electric charges
- Discovery of ideal Weyl points with helicoid surface states
- Algebraic skin effect in two-dimensional non-Hermitian metamaterials
- Intrinsic Topological Weyl Phase Transition Induced by a Magnetostructural Transformation in a Kagome Magnet
- Three-dimensional single gyroid photonic crystals with a mid-infrared bandgap
- Synthetic Weyl points in generalized parameter space and their topological properties
- Breakdown of chiral anomaly and emergent phases in Weyl semimetals under orbital magnetic fields
- Type-II Weyl Excitation in Vortex Arrays
- Surface density-of-states on semi-infinite topological photonic and acoustic crystals
- Dynamical Weyl Points and 4D Nodal Rings in Cold Atomic Gases
- Biot-Savart law in quantum matter
- Thermo-magneto-electric transport through a torsion dislocation in a type I Weyl Semimetal