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Recent Submissions

The study of weak decays induced by [Formula presented] transition in light-cone sum rules Alıyev, Tahmasıb; Bilmiş, Selçuk; Savcı, Mustafa (2023-12-10) In this study, we analyzed the weak decays induced by [Formula presented] transitions within the light-cone sum rules. Specifically, semileptonic decays of the bottom baryons into the P-wave baryons Λb→Λc(2625)ℓνl and Ξb→Ξ...
A new method to determine the continuous refractive index of an absorbing film by Generalized Stockwell Transform COŞKUN, EMRE; Emir, Cansu; Selamet, Semanur; Parlak, Mehmet; ÖZDER, SERHAT (2023-12-01) Generalized Stockwell Transform (GST) was adapted to analyze a transmittance signal to continuously determine the refractive index and extinction coefficient. The process is built by analyzing oscillation frequencies of th...
Exploring the linear and nonlinear optical behavior of (TlInS2)0.75(TlInSe2)0.25: Insights from ellipsometry measurements Isik, M.; Guler, I.; Hasanlı, Nızamı (2023-11-15) The search for layered structured new semiconductor materials with remarkable optical properties has become a driving force, especially for materials science. Tl2In2S3Se [(TlInS2)0.75(TlInSe2)0.25], a fascinating compound,...
Facile synthesis of Ag-coated Au-Ag nanoworms and their shell specific etching for enhanced catalytic activity Khan, Ghazanfar Ali; Demirtaş, Özge; Bek, Alpan; Ahmed, Waqqar (2023-11-01) One-dimensional noble-metal nanoparticles (NPs) and their surface modifications to enhance defect states are critical for heterogeneous catalysis. Herein, we report a remarkable enhancement in the catalytic activity of Au-...
Temperature-dependent optical properties of TiO2 nanoparticles: a study of band gap evolution Isik, Mehmet; Delice, Serdar; Hasanlı, Nızamı (2023-10-01) In this study, we present the first comprehensive investigation of the temperature-dependent band gap energy of anatase TiO2 nanoparticles, utilizing transmission measurements in the range of 10–300 K. X-ray diffraction pa...
Ulexite/HDPE-Bi2O3/HDPE layered composites for neutron and gamma radiation shielding ALVER, ÜMİT; Duran, Selcen Uzun; Demirköz, Melahat Bilge; Muçogllava, Brunilda; ASLAN, MUSTAFA; ÇAVA, KUTAY; ÖZKALAYCI, FATİH; Dindar, Osman (2023-10-01) In this study, 5, 10, and 15 wt% ulexite (NaCaB5O6(ΟH)6·5H2O, hydrated sodium calcium borate hydroxide) and 15 wt %Bi2O3 filled high density polyethylene (HDPE) composite materials were fabricated through conventional melt...
Nanowire geometry effects on devices and transport mechanisms: SnS2/SiNW heterojunction COŞKUN, EMRE; Emir, Cansu; TERLEMEZOĞLU BİLMİŞ, MAKBULE; Parlak, Mehmet (2023-10-01) The semiconductor nanowire technology has become essential in developing more complex and efficient devices. In this study, the Si nanowire (SiNW) heterojunction structure with a two-dimensional SnS2 thin film was investig...
A new geometric flow on 3-manifolds: the K-flow Tasseten, Kezban; Tekin, Bayram (2023-10-01) We define a new geometric flow, which we shall call the K-flow, on 3-dimensional Riemannian manifolds; and study the behavior of Thurston’s model geometries under this flow both analytically and numerically. As an example,...
Development of proton beam irradiation system for the NA65/DsTau experiment Aoki, Shigeki; et. al. (2023-10-01) Tau neutrino is the least studied lepton of the Standard Model (SM). The NA65/DsTau experiment targets to investigate Ds , the parent particle of the ντ , using the nuclear emulsion-based detector and to decrease the syste...
A simpler security proof for 6-state quantum key distribution Akyüz, Kaan; Škorić, Boris (2023-09-01) Six-state Quantum Key Distribution (QKD) achieves the highest key rate in the class of qubit-based QKD schemes. The standard security proof, which has been developed since 2005, invokes complicated theorems involving smoot...
Radiative decays of the spin- 3/2 to spin- 1/2 doubly heavy baryons in QCD Alıyev, Tahmasıb; Aşkan, Emre; Özpineci, Altuğ (2023-09-01) The spin-3/2 to spin-1/2 doubly heavy baryon transition magnetic dipole GM and electric quadrupole GE form factors are calculated in the framework of the light cone sum rules method. Moreover, the decay widths of correspon...
Vortex lattices in strongly confined quantum droplets Yoğurt, Taha Alper; Tanyeri, Umut; Keleş, Ahmet; Oktel, M.Ö. (2023-09-01) Bose mixture quantum droplets display a fascinating stability that relies on quantum fluctuations to prevent collapse driven by mean-field effects. Most droplet research focuses on untrapped or weakly trapped scenarios, wh...
Silica aerogel as rear reflector in silicon heterojunction solar cells for improved infrared response Kocak, Damla; Tsoi, Konstantin; Turkay, Deniz; Koc, Mehmet; Donercark, Ergi; Budunoglu, Hulya; Yerci, Selçuk (2023-08-15) Silicon (Si), with its indirect bandgap, is a non-ideal absorber. Thus, various strategies to boost silicon solar cells' efficiency, including advanced texturing, multilayer anti-reflecting coating, and rear reflectors are...
Partition function of a volume of space in a higher curvature theory Tavlayan, Aydın; Tekin, Bayram (2023-08-15) Recently, Jacobson and Visser [Partition Function for a Volume of Space, Phys. Rev. Lett. 130, 221501 (2023).PRLTAO0031-900710.1103/PhysRevLett.130.221501] calculated the quantum partition function of a fixed, finite volum...
Temperature-dependent current–voltage characteristics of p-GaSe0.75S0.25/n-Si heterojunction Isik, M.; Surucu, O.; Hasanlı, Nızamı (2023-08-01) GaSe0.75S0.25 having layered structure is a potential semiconductor compound for optoelectronics and two-dimensional materials technologies. Optical and structural measurements of the GaSe0.75S0.25 thin film grown on the g...
On thermodynamics of compact objects Aydemir, Ufuk; Ren, Jing (2023-08-01) With the recent progress in observations of astrophysical black holes, it has become more important to understand in detail the physics of strongly gravitating horizonless objects. If the objects identified in the ob...
On the passivation performance of SiNx, SiOxNy and their stack on c-Si wafers for solar cell applications: Correlation with optical, chemical and interface properties Canar, Hasan Hüseyin; Bektaş, Gence; Turan, Raşit (2023-07-01) SiNx and SiOxNy layers deposited by the PECVD method are commonly used in silicon solar cells for theirexcellent thin film properties. In this study, we perform an experimental analysis of the optical, chemical andelectric...
Thermal and fluid dynamic optimization of a CPV-T receiver for solar co-generation applications: Numerical modelling and experimental validation Santos, Daniel; Azgın, Ahmet; Castro, Jesus; Kizildag, Deniz; Rigola, Joaquim; TUNÇEL, BİLGE; Turan, Raşit; Preßmair, Rupert; Felsberger, Richard; Buchroithner, Armin (2023-07-01) Solar co-generation, i.e., the generation of electricity and heat in a single device by concentrating the sunbeams, has the potential to significantly increase the overall system performance. The main challenge is related ...
Tunable nonlinear absorption and optical limiting behavior of NaBi(MoxW1-xO4)(2) single crystals with ratio of Molybdenum/Tungsten PEPE, YASEMİN; YILDIZ, ELİF; Isik, Mehmet; KARATAY, AHMET; Hasanlı, Nızamı; ELMALI, AYHAN (2023-07-01) The compositional effect of Mo/W ratio on linear, nonlinear absorption and optical limiting behavior of the NaBi(MoxW1-xO4)(2) single crystals grown by Czochralski technique was investigated. X-ray diffraction patterns of ...
The effect of SiNx:H stoichiometry on electrical and chemical passivation of Al2O3/SiNx:H stack layer on p-type silicon wafers Canar, Hasan Hüseyin; Bektaş, Gence; Keçeci, Ahmet Emin; Asav, Hasan; Bütüner, Sümeyye Koçak; Arlkan, Bülent; Turan, Raşit (2023-06-27) In this paper, we report on the influence of SiNx:H stoichiometry on Al2O3/SiNx:H passivation stacks. We analyze the fabricated dielectric layers with four methods: FTIR, C-V, PCD and EQE. SiNx:H with a lower refractive in...

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