Recent Submissions

  • Analyzing the InGaN LED structures for white LED applications 

    Durukan, İ. K.; Öztürk, M. K.; Özçelik, S.; Özbay, Ekmel (Gazi Üniversitesi, 2017)
    In this paper, blue-light InGaN/GaN light-emitting diodes were deposited on sapphire substrate by the Metal Organic Chemical Vapor Deposition (MOCVD) to investigate the properties of blue LEDs with various well thickness ...
  • Functional gold nanoparticle coated surfaces for CA 125 cancer biomarker detection 

    Tunç, İ.; Susapto, Hepi Hari; Güler, Mustafa Özgür (TÜBİTAK, 2015)
    Here we describe the detailed characterization of gold nanoparticle (Au Np) functionalized surfaces as a biosensing platform by studying a model streptavidin (SA)–biotin interaction. Conjugation of SA on Au Np immobilized on ...
  • Analysis of the mosaic defects in graded and non graded InxGa1‐xN solar cell structures 

    Kars Durukan, İ.; Öztürk, M. K.; Özçelik, S.; Özbay, Ekmel (Süleyman Demirel Üniversitesi, 2017)
    In this study, graded (A) InxGa1‐xN (10.5 ≤ x ≤ 18.4) and non graded (B) InxGa1‐xN (13.6 ≤ x ≤ 24.9) samples are grown on c‐oriented sapphire substrate using the Metal Organic Chemical Vapour Deposition (MOCVD) technique. ...
  • Reply to tzoulis et al.: genetic and clinical heterogeneity of essential tremor 

    Gülsuner, Hilal Ünal; Gülsuner, S.; Mercan, F.; Onat, Onur Emre; Walsh, T.; Shahin, H.; Lee, M.; Dogu, O.; Kansu, T.; Topaloglu, H.; Elibol, B.; Akbostanci, C.; King, M. -C.; Özçelik, Tayfun; Tekinay, Ayse B. (National Academy of Sciences, 2015)
    In addressing our recent report of HTRA2 p.G399S as the gene and mutation responsible for essential tremor and subsequent Parkinson disease in a large kindred (1), Tzoulis et al. (2) screened this mutation in patients with ...
  • Effects of the AlN nucleation layer thickness on the crystal structures of an AlN epilayer grown on the 6H-SiC substrate 

    Arslan, Engin; Öztürk, M. K.; Özçelik, S.; Özbay, Ekmel (Taylor & Francis, 2019-04-08)
    The influence of the LT-AlN(NL) growth times on the mosaic structure parameters of the AlN layer grown on the LT-AlN(NL)/6H-SiC structures as well as the dislocation densities and the strain behaviours in the AlN epilayers ...
  • Investigation of electronic and optical properties of wurtzite MgZnO using GGA + U formalism 

    Ibrahem, R.; Narin, P.; Lisesivdin, S. B.; Özbay, Ekmel (Taylor & Francis, 2019-12-04)
    In this study, the electronic and optical properties of wurtzite MgxZn1−xO structures for different Mg mole fractions (x) are studied using Density Functional Theory (DFT). In calculations, the generalised gradient ...
  • Two-dimensional phononic band structure of archimedean-logarithmic spiral-based slabs 

    Palaz, S.; Oltulu, O.; Mamedov, Amirullah M.; Özbay, Ekmel (Taylor & Francis, 2019-08-16)
    We present band structure results for elastic waves in periodic composite materials consisting of a spiral scatterer shape embedded in a uniform silicon matrix. The material of the scatterer is tungsten as a high density ...
  • Multiferroic based 2D phononic crystals: band structure and wave propagations 

    Palaz, S.; Özer, Z.; Ahundov, C.; Mamedov, Amirullah M.; Özbay, Ekmel (Taylor & Francis, 2019-08)
    In the present work the acoustic band structure of a two-dimensional phononic crystal containing an organic ferroelectric (PVDF- polyvinylidene fluoride) and muliferroic material (LiVCuO4) were investigated by the ...
  • Electronic and elastic properties of the multiferroic crystals with the Kagome type lattices -Mn3V2O8 and Ni3V2O8: First principle calculations 

    Koç, H.; Palaz, S.; Mamedov, Amirullah M.; Özbay, Ekmel (Taylor & Francis, 2019-08-16)
    The electronic, mechanical, and optical properties of the Kagome staircase compounds, Mn3V2O8 and Ni3V2O8, have been investigated using the VASP (Vienna ab-initio Simulation Program) that was developed within the density ...
  • Strain effects and electronic structures of narrow band P-R ferroelectrics: first principles calculation 

    Bozdağ, N.; Koç, H.; Şimşek, Ş.; Mamedov, Amirullah M.; Özbay, Ekmel (Taylor & Francis, 2019-08-16)
    In the present work, the structural, mechanical, electronic and optical properties of the Ruddlesden–Popper(RP) Ba3X2S7 (X = Zr, Hf, Ti) sulfides compounds have been investigated by means of first principles calculations. ...
  • Phononic band gap and wave propagation on multiferroic-based acoustic metamaterials 

    Palaz, S.; Oltulu, O.; Özer, Z.; Mamedov, Amirullah M.; Özbay, Ekmel (Taylor & Francis, 2019-06-04)
    In the present work, the acoustic band structure of a two-dimensional (2D) phononic crystal containing a multiferroic and liquid were investigated by the plane-wave-expansion method. 2D PnC with triangular and honeycomb ...
  • Photonic band gap of multiferroic-dielectric materials in the IR region: FDTD method 

    Palaz, S.; Şimşek, Ş.; Mamedov, Amirullah M.; Özbay, Ekmel (Taylor & Francis, 2019-06-04)
    In this report, we present an investigation of the optical properties and band structure calculations for the photonic structures based on the multiferroic materials- BaMnF4. We calculate the photonic bands and optical ...
  • Electronic properties of spin excitation in multiferroics with a spinel structure: first principles calculation 

    Koç, H.; Palaz, S.; Mamedov, Amirullah M.; Özbay, Ekmel (Taylor & Francis, 2019-06-04)
    In the present work, the structural, electronic and mechanical properties of LiVCuO4 and LiCu2O4 spinel type multiferroics have been investigated by means of first principles calculations. The spin polarized generalized ...
  • Structural, electronic, and mechanical properties of A3Mn2O7 (A = Sr, Ca): ab initio calculation 

    Şimsek, Ş.; Koç, H.; Mamedov, Amirullah M.; Özbay, Ekmel (Taylor & Francis, 2019-04-17)
    In the present study, the structural, electronic, optical, and mechanical properties of the Ruddlesden-Popper type oxide compounds are investigated by means of density functional theory. In our calculation, spin polarized ...
  • Scattering analysis of ultrathin barrier (<7 nm) GaN‑based heterostructures 

    Narin, P.; Arslan, Engin; Öztürk, M.; Öztürk, Mustafa; Lisesivdin, S. B.; Özbay, Ekmel (Springer, 2019-03)
    In this study, two-dimensional electron gas (2DEG) mobility analysis of AlN/GaN and InAlN/GaN structures with ultrathin barrier layers by metal organic chemical vapor deposition (MOCVD) has been performed with Hall efect ...
  • On the elastic properties of INGAN/GAN LED structures 

    Bilgili, A. K.; Akpınar, Ö.; Öztürk, M. K; Başköse, C.; Özçelik, S.; Özbay, Ekmel (Springer, 2019-01)
    In this study, three InGaN/GaN light-emitting diode (LED) structures with five periods are investigated grown by metal organic chemical vapor deposition (MOCVD) technique. During growth of these three samples, active layer ...
  • Investigation of structural, optical and morphological properties of InGaN/GaN structure 

    Bilgili, A. K.; Akpınar, Ö.; Öztürk, M. K; Başköse, C.; Özçelik, S.; Özbay, Ekmel (Springer, 2019)
    In this study, InGaN/GaN structure is investigated in the temperature range of 300–500 °C with steps of 50 °C. InGaN/ GaN multi-quantum well structure is deposited on c-orientated sapphire wafer by metal organic chemical ...
  • All ceramic-based metal-free ultra-broadband perfect absorber 

    Soydan, Mahmut Can; Ghobadi, Amir; Yıldırım, Deniz Umut; Ertürk, Vakur Behçet; Özbay, Ekmel (Springer, 2019-06-19)
    In this paper, we scrutinize unprecedented potential of transition metal carbides (TMCs) and nitrides (TMNs) for realization of light perfect absorption in an ultra-broad frequency range encompassing all of the visible ...
  • Ketone body signaling mediates intestinal stem cell homeostasis and adaptation to diet 

    Cheng, C.-W.; Biton, M.; Haber, A. L.; Gündüz, Nuray; Eng, G.; Gaynor, L. T.; Tripathi, S.; Çalıbaşı-Koçal, G.; Rickelt, S.; Butty, V. L.; Moreno-Serrano, M.; Iqbal, A. M.; Bauer-Rowe, K. E.; Imada, S.; Ulutaş, M. S.; Mylonas, C.; Whary, M. T.; Levine, S. S.; Başbınar, Y.; Hynes, R. O.; Mino-Kenudson, M.; Deshpande, V.; Boyer, L. A.; Fox, J. G.; Terranova, C.; Rai, K.; Piwnica-Worms, H.; Mihaylova, M. M.; Regev, A.; Yılmaz, Ö. H. (Cell Press, 2019)
    Little is known about how metabolites couple tissue-specific stem cell function with physiology. Here we show that, in the mammalian small intestine, the expression of Hmgcs2 (3-hydroxy-3-methylglutaryl-CoA synthetase 2), ...
  • Real-time impedimetric droplet measurement (iDM) 

    Saateh, Abtin; Kalantarifard, Ali; Çelik, Oğuz Tolga; Asghari, Mohammad; Serhatlıoğlu, Murat; Elbüken, Çağlar (Royal Society of Chemistry, 2019-10)
    Droplet-based microfluidic systems require a precise control of droplet physical properties; hence, measuring the morphological properties of droplets is critical to obtain high sensitivity analysis. The ability to perform ...

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