• Effect of annealing on the density of defects in epitaxial CdTe (211)/GaAs 

  Bakali, Emine; Selamet, Yusuf; Tarhan, Enver (Springer, 2018-08)

  CdTe thin films were grown on GaAs (211) wafers by molecular beam epitaxy as the buffer layer for HgCdTe infrared detector applications. We studied the effect of annealing on the density of dislocation of these CdTe thin ...

• Cross-like terahertz metamaterial absorber for sensing applications 

  Sabah, Cumali; Mulla, Batuhan; Altan, Hakan; Özyüzer, Lütfi (Springer, 2018-08)

  In this work, a new multiband terahertz metamaterial absorber is designed and characterised by numerical simulation method. In addition, the utilisation of the proposed absorber as a sensor is also investigated. The ...

• Structural, vibrational, and electronic properties of single-layer hexagonal crystals of group IV and v elements 

  Özdamar, Burak; Özbal, Gözde; Çınar, Mustafa Neşet; Sevim, Koray; Kurt, Gizem; Kaya, Birnur; Sevinçli, Haldun (American Physical Society, 2018-07)

  Using first-principles density functional theory calculations, we investigate a family of stable two-dimensional crystals with chemical formula A2B2, where A and B belong to groups IV and V, respectively (A=C, Si, Ge, Sn, ...

• Are there really conformal frames? Uniqueness of affine inflation 

  Azri, Hemza (World Scientific Publishing, 2018-07)

  Here, we concisely review the nonminimal coupling dynamics of a single scalar field in the context of purely affine gravity and extend the study to multifield dynamics. The coupling is performed via an affine connection ...

• Monitoring the doping and diffusion characteristics of Mn dopants in cesium lead halide perovskites 

  Güner, Tuğrul; Akbalı, Barış; Özcan, Mehmet; Topçu, Gökhan; Demir, Mustafa Muammer; Şahin, Hasan (American Chemical Society, 2018-05)

  Cesium lead perovskites, in the form of CsPbX3 or Cs4PbX6, have been widely used for various optoelectronic applications due to their exceptionally good optical properties. In this study, the effect of Mn doping on the ...

• Effect of substrate rotation speed and off-center deposition on the structural, optical, and electrical properties of AZO thin films fabricated by DC magnetron sputtering 

  Türkoğlu, Fulya; Köseoğlu, Hasan; Zeybek, S.; Özdemir, Mehtap; Aygün, Gülnur; Özyüzer, Lütfi (American Institute of Physics, 2018-04)

  In this study, aluminum-doped zinc oxide (AZO) thin films were deposited by DC magnetron sputtering at room temperature. The distance between the substrate and target axis, and substrate rotation speed were varied to get ...

• Study of undoped and indium doped ZnO thin films deposited by sol gel method 

  Medjaldi, M.; Touil, O.; Boudine, B.; Zaabat, M.; Halimi, O.; Sebais, M.; Özyüzer, Lütfi (Springer, 2018-11)

  In this paper, we report the effects of Indium doping concentrations (from 0 to 10wt%) on the structural, morphological, and optical properties of deposited In doped ZnO (IZO) thin films prepared by the sol–gel method ...

• The influence of plasma-based nitriding and oxidizing treatments on the mechanical and corrosion properties of CoCrMo biomedical alloy 

  Noli, Fotini; Pichon, Luc; Öztürk, Orhan (Springer, 2018-04)

  Plasma-based nitriding and/or oxidizing treatments were applied to CoCrMo alloy to improve its surface mechanical properties and corrosion resistance for biomedical applications. Three treatments were performed. A set of ...

• Strain mapping in single-layer two-dimensional crystals via Raman activity 

  Yağmurcukardeş, Mehmet; Bacaksız, Cihan; Ünsal, Emre; Akbalı, Barış; Senger, Ramazan Tuğrul; Şahin, Hasan (American Physical Society, 2018-03)

  By performing density functional theory-based ab initio calculations, Raman-active phonon modes of single-layer two-dimensional (2D) materials and the effect of in-plane biaxial strain on the peak frequencies and corresponding ...

• Induced affine inflation 

  Azri, Hemza; Demir, Durmuş Ali (American Physical Society, 2018-02)

  Induced gravity, metrical gravity in which gravitational constant arises from vacuum expectation value of a heavy scalar, is known to suffer from Jordan frame vs Einstein frame ambiguity, especially in inflationary dynamics. ...

• P3HT-graphene bilayer electrode for Schottky junction photodetectors 

  Aydın, Hasan; Kalkan, Sırrı Batuhan; Varlıklı, Canan; Çelebi, Cem (IOP Publishing, 2018-02)

  We have investigated the effect of a poly (3-hexylthiophene-2.5-diyl)(P3HT)-graphene bilayer electrode on the photoresponsivity characteristics of Si-based Schottky photodetectors. P3HT, which is known to be an electron ...

• Experimental and computational investigation of graphene/SAMs/n-Si Schottky diodes 

  Aydın, Hasan; Bacaksız, Cihan; Yağmurcukardeş, Nesli; Karakaya, Caner; Mermer, Ömer; Can, Mustafa; Senger, Ramazan Tuğrul; Şahin, Hasan; Selamet, Yusuf (Elsevier, 2018-01)

  We have investigated the effect of two different self-assembled monolayers (SAMs) on electrical characteristics of bilayer graphene (BLG)/n-Si Schottky diodes. Novel 4″bis(diphenylamino)-1, 1′:3″-terphenyl-5′ carboxylic ...

• Thermally and optically tunable sub-terahertz superconducting fishnet metamaterial 

  Sabah, Cumali; Mulla, Batuhan; Altan, Hakan; Özyüzer, Lütfi (Elsevier, 2018-01)

  In this paper, a novel fishnet metamaterial structure is designed and analyzed under different material combinations and under different active controlling techniques. The results indicate that, the proposed fishnet ...

• Influence of sulfurization temperature on Cu2ZnSnS4 absorber layer on flexible titanium substrates for thin film solar cells 

  Buldu, Dilara Gökçen; Cantaş, Ayten; Türkoğlu, Fulya; Akça, Fatime Gülşah; Meriç, Ece; Özdemir, Mehtap; Tarhan, Enver; Özyüzer, Lütfi; Aygün, Gülnur (IOP Publishing, 2018-01)

  In this study, the effect of sulfurization temperature on the morphology, composition and structure of Cu2ZnSnS4 (CZTS) thin films grown on titanium (Ti) substrates has been investigated. Since Ti foils are flexible, they ...

• The effect of adsorbates on the electrical stability of graphene studied by transient photocurrent spectroscopy 

  Kalkan, Sırrı Batuhan; Aydın, H.; Özkendir, Dicle; Çelebi, Cem (American Institute of Physics, 2018-01)

  Adsorbate induced variations in the electrical conductivity of graphene layers with two different types of charge carriers are investigated by using the Transient Photocurrent Spectroscopy (TPS) measurement technique. ...

• Tuning electronic and magnetic properties of monolayer α-RuCl3 by in-plane strain 

  İyikanat, Fadıl; Yağmurcukardeş, Mehmet; Senger, Ramazan Tuğrul; Şahin, Hasan (Royal Society of Chemistry, 2018)

  By employing density functional theory-based methods, the structural, vibrational, electronic, and magnetic properties of monolayer α-RuCl3 were investigated. It was demonstrated that ferromagnetic (FM) and zigzag-antife ...

• Oxyhydroxide of metallic nanowires in a molecular H2O and H2O2 environment and their effects on mechanical properties 

  Aral, Gürcan; İslam, Md Mahbubul; Wang, Yun-Jiang; Ogata, Shigenobu; van Duin, Adri C. T. (Royal Society of Chemistry, 2018)

  To avoid unexpected environmental mechanical failure, there is a strong need to fully understand the details of the oxidation process and intrinsic mechanical properties of reactive metallic iron (Fe) nanowires (NWs) under ...

• Stress-energy connection: Degravitating the vacuum energy 

  Demir, Durmuş Ali (World Scientific Publishing, 2013)

  This talk summarizes recent studies on the gravitational properties of vacuum energy in a non-Riemannian geometry formed by the stress-energy tensor of vacuum, matter and radiation. Postulating that the gravitational effects ...

• Conductance fluctuations in undoped hydrogenated amorphous silicon-germanium alloy thin films 

  Güneş, Mehmet; Johanson, Robert E.; Kasap, Safa O.; Yang, Jeffrey C.; Guha, Subhendu (Elsevier, 2002-04)

  We report coplanar conductance fluctuations of device quality, undoped hydrogenated amorphous silicon-germanium alloy thin films (a-SiGe:H) measured from 430 to 490 K. The a-SiGe:H alloys produce noise power spectra similar ...

• Correlation of tunneling spectra in Bi2Sr2CaCu2O8+δ with the resonance spin excitation 

  Zasadzinski, John F.; Özyüzer, Lütfi; Miyakawa, Nobuaki; Gray, Kenneth E.; Hinks, David G.; Kendziora, Christopher A. (American Physical Society, 2001-08)

  New break-junction tunneling data are reported in Bi2Sr2CaCu2O8+δ over a wide range of hole concentration from underdoped (Tc=74k) to optimal doped (Tc=95k) to overdoped (Tc=48k). The conductances exhibit sharp dips at a ...

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