• Atomistic insights on the influence of pre-oxide shell layer and size on the compressive mechanical properties of nickel nanowires 

  Aral, Gürcan; Islam, Md Mahbubul; Wang, Yun-Jiang; Ogata, Shigenobu; van Duin, Adri C. T. (American Institute of Physics, 2019-04)

  We used ReaxFF reactive molecular dynamics simulations to systematically investigate the effects of a pre-oxide shell layer on the mechanical properties of [001]-oriented nickel (Ni) nanowires (NWs) under the uniaxial ...

• Raman fingerprint of stacking order in HfS2-Ca(OH)(2) heterobilayer 

  Yağmurcukardeş, Mehmet; Özen, Sercan; İyikanat, Fadıl; Peeters, François M.; Şahin, Hasan (American Physical Society, 2019-05)

  Using density functional theory-based first-principles calculations, we investigate the stacking order dependence of the electronic and vibrational properties of HfS2-Ca(OH)(2) heterobilayer structures. It is shown that ...

• The growth of silver nanostructures on porous silicon for enhanced photoluminescence: The role of AgNO3 concentration and deposition time 

  Çetinel, Alper; Artunç, Nurcan; Tarhan, Enver (EDP Sciences, 2019)

  Silver nanostructures were obtained by using the electrodeposition method on n-type porous silicon (PSi) under different deposition times and concentrations of AgNO3 solutions. The analyses of the structural and photoluminescence ...

• Evaluation of exact quantum query complexities by semidefinite programming 

  Uyanık, Kıvanç (Springer, 2019-06)

  One of the difficult tasks in quantum computation is inventing efficient exact quantum algorithms, which are the quantum algorithms that output the correct answer with certainty on any input. We improve and generalize the ...

• Thermodynamics of regular black holes with cosmic strings 

  Bayraktar, Ceren H. (Springer, 2018-09)

  In this article, the thermodynamics of regular black holes with a cosmic string passing through them is studied. We will observe that the string has no effect on the temperature as well as on the relation between entropy ...

• 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 ...

• Comparision of in situ spectroscopic ellipsometer and ex situ x-ray photoelectron spectroscopy depth profiling analysis of HfO2/Hf/Si multilayer structure 

  Cantaş, Ayten; Özyüzer, Lütfi; Aygün, Gülnur (Institute of Physics Publishing, 2018-09)

  A HfO2 film was grown by RF magnetron sputtering technique on a Si substrate Using in situ Spectroscopic Ellipsometry (SE), the film thickness and refractive index were examined as a function of deposition time. Ex situ ...

• Structural, electronic and phononic properties of PtSe2: From monolayer to bulk 

  Kandemir, Ali; Akbalı, Barış; Kahraman, Z.; Badalov, S. V.; Özcan, Mehmet; İyikanat, Fadıl; Şahin, Hasan (Institute of Physics Publishing, 2018-06)

  The layer dependent structural, electronic and vibrational properties of the 1T phase of two dimensional (2D) platinum diselenide are investigated by means of state-of-the-art first-principles calculations. The main findings ...

• Importance of CdS buffer layer thickness on Cu2ZnSnS4-based solar cell efficiency 

  Cantaş, Ayten; Türkoğlu, Fulya; Meriç, Ece; Akça, Fatime Gülşah; Özdemir, Mehtap; Tarhan, Enver; Özyüzer, Lütfi; Aygün, Gülnur (Institute of Physics Publishing, 2018-06)

  Cu2ZnSnS4 (CZTS) thin films were grown on Mo-coated soda lime glass (SLG) substrates by the sulfurization of DC magnetron-sputtered Zn, Sn and Cu metallic precursors under a sulfur atmosphere at 550 °C for 45 min. Understanding ...

• Wigner crystallization in topological flat bands 

  Jaworowski, Błażej; Güçlü, Alev Devrim; Kaczmarkiewicz, Piotr; Kupczyński, Michał; Potasz, Paweł; Wójs, Arkadiusz (Institute of Physics Publishing, 2018-06)

  We study the Wigner crystallization on partially filled topological flat bands of kagome, honeycomb and checkerboard lattices. We identify the Wigner crystals (WCs) by analyzing the Cartesian and angular Fourier transform ...

• The effect of atmospheric gases on the electrical stability of graphene 

  Kalkan, Sırrı Batuhan (Izmir Institute of Technology, 2017-12)

  In this thesis, adsorbate induced variations in the electrical conductivity of graphene layers with two different types of charge carriers are investigated experimentally by using Transient Photocurrent Spectroscopy (TPS) ...

• Comparison of photocatalytic properties of TiO2 thin films and fibers 

  Özdemir, Mehtap; Kurt, Metin; Özyüzer, Lütfi; Aygün, Gülnur (EDP Sciences, 2016-09)

  Efficiency of solar panels degrades as a result of organic contamination such as airborne particles, bird droppings and leaves. Any foreign object on photovoltaic panels reduces the sunlight entering the absorbing surface ...

• Softly fine-tuned Standard Model and the scale of inflation 

  Korutlu, Beste (World Scientific Publishing, 2015-11)

  The direct coupling between the Higgs field and the spacetime curvature, if finely tuned, is known to stabilize the Higgs boson mass. The fine-tuning is soft because the Standard Model (SM) parameters are subject to no ...

• Semiclassical black holes with large N rescaling and information loss problem 

  Yeom, Dong-Han; Zoe, Heeseung (World Scientific Publishing, 2011-07)

  We consider semiclassical black holes and related rescalings with N massless fields. For a given semiclassical solution of an N = 1 universe, we can find other solution of a large N universe by the rescaling. After the ...

• Hydrogen-induced sp2-sp3 rehybridization in epitaxial silicene 

  Solonenko, Dmytro; Dzhagan, Volodymyr; Cahangirov, Seymur; Bacaksız, Cihan; Şahin, Hasan; Zahn, Dietrich R. T.; Vogt, Patrick (American Physical Society, 2017-12)

  We report on the hydrogenation of (3×3)/(4×4) silicene epitaxially grown on Ag(111) studied by in situ Raman spectroscopy and state-of-the-art ab initio calculations. Our results demonstrate that hydrogenation of (3×3)/(4×4) ...

• S- and T-self-dualities in dilatonic f(R) theories 

  Rador, Tonguç (Springer, 2017-12)

  We search for theories, in general spacetime dimensions, that would incorporate a dilaton and higher powers of the scalar Ricci curvature such that they have exact S- or T-self-dualities. The theories we find are free of ...

• Hydrogenation-driven phase transition in single-layer TiSe2 

  İyikanat, Fadıl; Kandemir, Ali; Özaydın, H. Duygu; Senger, Ramazan Tuğrul; Şahin, Hasan (IOP Publishing, 2017-11)

  First-principles calculations based on density-functional theory are used to investigate the effects of hydrogenation on the structural, vibrational, thermal and electronic properties of the charge density wave (CDW) phase ...

• Stable ultra-thin CdTe crystal: A robust direct gap semiconductor 

  İyikanat, Fadıl; Akbalı, Barış; Kang, J.; Senger, Ramazan Tuğrul; Selamet, Yusuf; Şahin, Hasan (IOP Publishing, 2017-11)

  Employing density functional theory based calculations, we investigate structural, vibrational and strain-dependent electronic properties of an ultra-thin CdTe crystal structure that can be derived from its bulk counterpart. ...

• Statistical approach to tunneling time in attosecond experiments 

  Demir, Durmuş Ali; Güner, Tuğrul (Elsevier, 2017-11)

  Tunneling, transport of particles through classically forbidden regions, is a pure quantum phenomenon. It governs numerous phenomena ranging from single-molecule electronics to donor–acceptor transition reactions. The main ...

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