Observation of the topological edge state in X-ray band

Abstract

The possibility of obtaining robust edge state of light by mimicking the topological properties of solid state system, have brought a profound impact on optical sciences. With the advent of high-brilliance, accelerator-driven light sources such as storage rings or X-ray lasers, it has become attractive to extend the concept of optical topological manipulation to the X-ray regime. In this paper, we theoretically proposed and experimentally demonstrated the topological edge state at the interface of two photonic crystals having different band-gap topological characteristics for X-ray. Remarkably, this topologically protected edge state is immune to the weak disorder in form of the thickness disorder and strong disorder in form of the positional disorder of layers in the structure, as long as the zero-average-effective-mass condition is satisfied. Our investigation therefore brings the topological characteristics to the X-ray regime, provides new theoretical tools to study X-ray optics and may pave way to exploit some important potential applications, such as the high efficiency band filter in X-ray band.

arXiv comment20 pages, 6 figures

References in corpus (17)

• Quantum Spin Hall Effect in Graphene
• Photonic Floquet Topological Insulators
• Possible Realization of Directional Optical Waveguides in Photonic Crystals with Broken Time-Reversal Symmetry
• Quantum Spin Hall Effect
• Photonic Analogue of Two-dimensional Topological Insulators and Helical One-Way Edge Transport in Bi-Anisotropic Metamaterials
• Imaging topological edge states in silicon photonics
• Scheme to Achieve Silicon Topological Photonics
• Acoustic topological insulator and robust one-way sound transport
• Direct Measurement of the Zak phase in Topological Bloch Bands
• Observation of phononic helical edge states in a mechanical 'topological insulator'
• Observation of topological valley transport of sound in sonic crystals
• Topological mechanics of gyroscopic metamaterials
• Selective enhancement of topologically induced interface states in a dielectric resonator chain
• Surface Impedance and Bulk Band Geometric Phases in One-Dimensional Systems
• Optical Resonator Analog of a Two-Dimensional Topological Insulator
• Revealing the topology of quasicrystals with a diffraction experiment
• Photonic Spin Hall Effect in Waveguides Composed of Two Types of Single-Negative Metamaterials