Topological valleytronics: Brought to light

Abstract

The topological valley Hall effect was predicted as a consequence of the bulk topology of electronic systems. Now it has been observed in photonic crystals, showing that both topology and valley are innate to classical as well as quantum systems. The discovery of counterflow in opposite valleys not only demonstrates that the valley can be a novel carrier of information and energy --- particularly valuable for systems without charge and spin --- but also exemplifies that symmetry-protected band topology can be universal to both quantum and classical systems.

3 Pages, News & Views

References in corpus (7)

• The Valley Hall Effect in MoS2 Transistors
• Observation of topological valley transport of sound in sonic crystals
• Detecting Topological Currents in Graphene Superlattices
• Topologically-protected refraction of robust kink states in valley photonic crystals
• Topological confinement in bilayer graphene
• Topological Origin of Equatorial Waves
• Electronic Highways in Bilayer Graphene

Cited by in corpus (9)

• Topological Sound
• Intrinsic valley Hall transport in atomically thin MoS2
• Moiré Band Topology in Twisted Bilayer Graphene
• ${\mathbb{Z}}_2$ topological insulator analog for vortices in an interacting bosonic quantum fluid
• Angular-dependent Klein tunneling in photonic graphene
• Circular Dichroism and Radial Hall Effects in Topological Materials
• Quasi-One-Dimensional Higher-Order Topological Insulators
• Topologically Protected Photonic Modes in Composite Quantum Hall/Quantum Spin Hall Waveguides
• Semiconductor Meta-Graphene and Valleytronics