Now showing items 1-9 of 9

    • Chiral single-wall gold nanotubes 

      Senger, R. T.; Dag, S.; Çıracı, Salim (American Physical Society, 2004)
      The formation of freestanding and tip-suspended chiral-wall (n,m) nanotubes, which were composed of helical atomic strands, from gold atoms was investigated using first-principles calculations, where (n,m) notation defines ...
    • Electronic and magnetic properties of zinc blende half-metal superlattices 

      Fong, C. Y.; Qian, M. C.; Pask, J. E.; Yang, L. H.; Dag, S. (A I P Publishing LLC, 2004)
      Zinc blende half-metallic compounds such as CrAs, with large magnetic moments and high Curie temperatures, are promising materials for spintronic applications. We explore layered materials, consisting of alternating ...
    • Initial stages of SiGe epitaxy on Si(001) studied by scanning tunneling microscopy 

      Oral, A.; Ellialtioglu, R. (Elsevier BV, 1995)
      We have studied the initial stages of strained SiGe alloy growth on the Si(001)-(2 × 1) surface by scanning tunneling microscopy. The Si0.36Ge0.64 alloy was grown on the silicon substrate at various coverages (0.13-3.6 ML) ...
    • Lattice dynamics and elastic properties of lanthanum monopnictides 

      Gökoǧlu G.; Erkişi, A. (2008)
      In this study, first principles calculation results of the second order elastic constants and lattice dynamics of two lanthanum monopnictides, LaN and LaBi, which crystallize in rock-salt structure (B1 phase), are presented. ...
    • Novel high-K inverse silver oxide phases of SiO2, GeO2, SnO2, and their alloys 

      Sevik, C.; Bulutay, C. (Elsevier, 2006)
      The recently reported inverse silver oxide phase of SiO2 possesses a high dielectric constant as well as lattice constant compatibility to Si. We explore the closely related oxides, GeO2, SnO2 with the same inverse silver ...
    • Peculiar piezoelectric properties of soft two-dimensional materials 

      Sevik, C.; Çakır, D.; Gülseren, O.; Peeters, F. M. (American Chemical Society, 2016-06)
      Group II-VI semiconductor honeycomb monolayers have a noncentrosymmetric crystal structure and therefore are expected to be important for nano piezoelectric device applications. This motivated us to perform first-principles ...
    • Photonic band gap structures for WDM applications 

      Bayındır, Mehmet; Akarca, S. S.; Özbay, Ekmel (IEEE, 2002)
      A new structure by combining a single cavity and coupled-cavity waveguides (CCWs) for wavelength division multiplexing (WDM) applications was proposed. As such, a structure in which the coupling between the cavity mode and ...
    • Tkachenko modes of the square vortex lattice in a two-component bose-einstein condensate 

      Keçeli, M.; Oktel, M.O. (2006)
      We study Tkachenko modes of the square vortex lattice of a two-component Bose-Einstein condensate (BEC) in the mean-field quantum Hall regime, considering the coupling of these modes with density excitations. We derive the ...
    • Transmission and reflection properties of composite metamaterials in free space 

      Aydın, Koray; Çubukcu, Ertuğrul; Özbay, Ekmel; Bayındır, Mehmet (OSA, 2003)
      We measured transmission and reflection from SRRs, thin wires, and composite metamaterials in free space. X-band measurement exhibits high transmission magnitude for frequencies where both SRR and wire have effective ...