Advertisement

Topics

Valley Vortex States and Degeneracy Lifting via Photonic Higher-Band Excitation.

08:00 EDT 29th March 2019 | BioPortfolio

Summary of "Valley Vortex States and Degeneracy Lifting via Photonic Higher-Band Excitation."

We demonstrate valley-dependent vortex generation in photonic graphene. Without breaking inversion symmetry, the excitation of two valleys leads to the formation of an optical vortex upon Bragg reflection to the third equivalent valley, with its chirality determined by the valley degree of freedom. Vortex-antivortex pairs with valley-dependent topological charge flipping are also observed and corroborated by numerical simulations. Furthermore, we develop a three-band effective Hamiltonian model to describe the dynamics of the coupled valleys and find that the commonly used two-band model is not sufficient to explain the observed vortex degeneracy lifting. Such valley-polarized vortex states arise from high-band excitation without a synthetic-field-induced gap opening. Our results from a photonic setting may provide insight for the study of valley contrasting and Berry-phase-mediated topological phenomena in other systems.

Affiliation

Journal Details

This article was published in the following journal.

Name: Physical review letters
ISSN: 1079-7114
Pages: 123903

Links

DeepDyve research library

PubMed Articles [11642 Associated PubMed Articles listed on BioPortfolio]

Topologically Nontrivial Valley States in Bilayer Graphene Quantum Point Contacts.

We present measurements of quantized conductance in electrostatically induced quantum point contacts in bilayer graphene. The application of a perpendicular magnetic field leads to an intricate patter...

Unconventional Flatband Line States in Photonic Lieb Lattices.

Flatband systems typically host "compact localized states" (CLS) due to destructive interference and macroscopic degeneracy of Bloch wave functions associated with a dispersionless energy band. Using ...

Probing the Band Structure of Topological Silicon Photonic Lattices in the Visible Spectrum.

We study two-dimensional hexagonal photonic lattices of silicon Mie resonators with a topological optical band structure in the visible spectral range. We use 30 keV electrons focused to nanoscale sp...

Space Group Theory of Photonic Bands.

The wide-range application of photonic crystals and metamaterials benefits from the enormous design space of three-dimensional subwavelength structures. In this Letter, we study the space group constr...

Zero-Index Bound States in the Continuum.

Metamaterials with an effective zero refractive index associated with their electromagnetic response are sought for a number of applications in communications and nonlinear optics. A promising way tha...

Clinical Trials [3232 Associated Clinical Trials listed on BioPortfolio]

Safety Study of Seneca Valley Virus in Patients With Solid Tumors With Neuroendocrine Features

The primary purpose of the study is to determine if Seneca Valley Virus may be administered safely to patients with certain types of advanced cancer.

Rift Valley Fever in Kenya

The purpose of this study is to find out how, why, and when Rift Valley Fever (RVF) spreads. Participants will be 250 adults and children, aged 1 year and older, from the Ijara District, K...

Comparing TR Band to Statseal in Conjunction With TR Band

The primary objectives of this study are to evaluate the performance of StatSeal Advanced used in conjunction with the TR Band (SSA) as compared to the TR Band without SSA (TRB) relative t...

Functional Evaluation of Two Types of Totally Implanted Venous Ports

Totally implanted venous access ports allow a safe delivery of medication, mainly chemotherapy, but are also used for blood sampling. This last procedure is not always successful, as it ap...

Effectiveness Study of the BOA(R)-Constricting IV Band

The purpose of this study is to determine whether the BOA(R)-Constricting IV Band is superior to standard methods for starting an IV.

Medical and Biotech [MESH] Definitions

Infection with a fungus of the genus COCCIDIOIDES, endemic to the SOUTHWESTERN UNITED STATES. It is sometimes called valley fever but should not be confused with RIFT VALLEY FEVER. Infection is caused by inhalation of airborne, fungal particles known as arthroconidia, a form of FUNGAL SPORES. A primary form is an acute, benign, self-limited respiratory infection. A secondary form is a virulent, severe, chronic, progressive granulomatous disease with systemic involvement. It can be detected by use of COCCIDIOIDIN.

Moving or bringing something from a lower level to a higher one. The concept encompasses biomechanic stresses resulting from work done in transferring objects from one plane to another as well as the effects of varying techniques of patient handling and transfer.

The geographic area of the Mekong Valley in general or when the specific country or countries are not indicated. Usually includes Cambodia, Indochina, and Laos.

An overuse injury causing lateral knee pain that results from repetitive friction of the iliotibial band over the lateral femoral epicondyle.

An acute infection caused by the RIFT VALLEY FEVER VIRUS, an RNA arthropod-borne virus, affecting domestic animals and humans. In animals, symptoms include HEPATITIS; abortion (ABORTION, VETERINARY); and DEATH. In humans, symptoms range from those of a flu-like disease to hemorrhagic fever, ENCEPHALITIS, or BLINDNESS.

Advertisement
Quick Search
Advertisement
Advertisement

 


DeepDyve research library

Searches Linking to this Article