Defects in Insulators
نویسندگان
چکیده
منابع مشابه
Topological Defects and Gapless Modes in Insulators and Superconductors
We develop a unified framework to classify topological defects in insulators and superconductors described by spatially modulated Bloch and Bogoliubov de Gennes Hamiltonians.We consider Hamiltonians H(k,r) that vary slowly with adiabatic parameters r surrounding the defect and belong to any of the ten symmetry classes defined by time-reversal symmetry and particle-hole symmetry. The topological...
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The scattering of Dirac electrons by topological defects could be one of the most relevant sources of resistance in graphene and at the boundary surfaces of a three-dimensional topological insulator (3D TI). In the long wavelength, continuous limit of the Dirac equation, the topological defect can be described as a distortion of the metric in curved space, which can be accounted for by a rotati...
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A generalization of Smakula's equation is developed for the case of defect absorption in host materials with weak absorption but rapidly varying refractive index. As an example the generalization is applied to the a and /3 bands in ionic crystals. In the case of additively-colored KI it is found that the ratio of oscillator strengths is x 0.6. This result is in qualitative disagreement with the...
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We demonstrate that a Mott insulator lightly doped with holes is still an insulator at low temperature even without disorder. Hole localization obtains because the chemical potential lies in a pseudogap which has a vanishing density of states at zero temperature. The energy scale for the pseudogap is set by the nearest-neighbor singlet-triplet splitting. As this energy scale vanishes if transit...
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We present a direct atom-by-atom chemical identification of the nanostructures and defects of topological insulators (TIs) with a state-of-the-art atomic mapping technology. Combining this technique and density function theory calculations, we identify and explain the layer chemistry evolution of Bi(2)Te(3–x)Se(x) ternary TIs. We also reveal a long neglected but crucially important extended def...
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ژورنال
عنوان ژورنال: MRS Bulletin
سال: 1984
ISSN: 0883-7694,1938-1425
DOI: 10.1557/s0883769400051010