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We report the Drude oscillator strength D and the magnitude of the bulk band gap E_{g} of the epitaxially grown, topological insulator (Bi,Sb)_{2}Te_{3}. The magnitude of E_{g}, in conjunction with the model independent f-sum rule, allows us to establish an upper bound for the magnitude of D expected in a typical Dirac-like system composed of linear bands.(More)
Raman and x-ray photoelectron spectroscopy study of ferroelectric switching in Pb(Nb,Zr,Ti)O3 thin films Optical properties of cobalt slanted columnar thin films passivated by atomic layer deposition Appl. Intrinsic evolutions of optical functions, band gap, and higher-energy electronic transitions in VO2 film near the metal-insulator transition region(More)
An optical study of fully strained ultrathin LaNiO 3 films is presented and compared with LDA + DMFT calculations. LaNiO 3 films were grown by pulsed laser deposition on LaAlO 3 and SrTiO 3 substrates which provide compressive and tensile strain, respectively. Optical conductivity data show a Drude peak with a spectral weight that is significantly reduced(More)
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