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  2. Photonic topological insulator - Wikipedia

    en.wikipedia.org/wiki/Photonic_topological_insulator

    Photonic topological phases are classical electromagnetic wave analogues of electronic topological phases studied in condensed matter physics. Similar to their electronic counterparts, they, can provide robust unidirectional channels for light propagation. [2] The field that studies these phases of light is referred to as topological photonics.

  3. Dirac cone - Wikipedia

    en.wikipedia.org/wiki/Dirac_cone

    The massless fermions lead to various quantum Hall effects, magnetoelectric effects in topological materials, and ultra high carrier mobility. [10] [11] Dirac cones were observed in 2008-2009, using angle-resolved photoemission spectroscopy (ARPES) on the potassium-graphite intercalation compound KC 8 [12] and on several bismuth-based alloys ...

  4. Topological insulator - Wikipedia

    en.wikipedia.org/wiki/Topological_insulator

    The properties of topological insulators and their surface states are highly dependent on both the dimension of the material and its underlying symmetries, and can be classified using the so-called periodic table of topological insulators. Some combinations of dimension and symmetries forbid topological insulators completely. [7]

  5. Skyrmion - Wikipedia

    en.wikipedia.org/wiki/Skyrmion

    A two-dimensional magnetic skyrmion, as a topological object, is formed, e.g., from a 3D effective-spin "hedgehog" (in the field of micromagnetics: out of a so-called "Bloch point" singularity of homotopy degree +1) by a stereographic projection, whereby the positive north-pole spin is mapped onto a far-off edge circle of a 2D-disk, while the ...

  6. Photonic crystal - Wikipedia

    en.wikipedia.org/wiki/Photonic_crystal

    Another promising method for developing two-dimensional photonic crystals is the so-called photonic crystal slab. These structures consist of a slab of material—such as silicon—that can be patterned using techniques from the semiconductor industry. Such chips offer the potential to combine photonic processing with electronic processing on a ...

  7. Frank–Kasper phases - Wikipedia

    en.wikipedia.org/wiki/Frank–Kasper_phases

    The alloy Nb 10 Ni 9 Al 3 is the prototype for the M phase. It has orthorhombic space group with 52 atoms per unit cell. The alloy Cr 9 Mo 21 Ni 20 is the prototype for the P-phase. It has a primitive orthorhombic cell with 56 atoms. The alloy Co 5 Cr 2 Mo 3 is the prototype for the R-phase which belongs to the rhombohedral space group with 53 ...

  8. Category:Photonics - Wikipedia

    en.wikipedia.org/wiki/Category:Photonics

    Pages in category "Photonics" The following 109 pages are in this category, out of 109 total. ... Photonic radar; Photonic topological insulator; Photonic-crystal ...

  9. Photonic metamaterial - Wikipedia

    en.wikipedia.org/wiki/Photonic_metamaterial

    The subwavelength periodicity [2] distinguishes photonic metamaterials from photonic band gap or photonic crystal structures. The cells are on a scale that is magnitudes larger than the atom, yet much smaller than the radiated wavelength, [3] [4] are on the order of nanometers. [3] [4] [5]