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Recent Submissions

Study of the effect of ionizing γ-radiation on the structural and vibrational properties of GaS and Yb-doped GaS (GaSYb) single crystals by X-ray diffraction (XRD) and Raman spectroscopy Madatov, R. S.; Turan, Raşit; Tagiev, T. B.; Sedani, Salar H.; Khaligzadeh, A. Sh; Genc, A. M.; Gulen, E.; Mamishova, R. M. (2026-03-01) This study investigates the effects of gamma irradiation on the structural and vibrational properties of GaS and Yb-doped GaS (GaSYb) single crystals. X-ray diffraction (XRD) analysis reveals that irradiation induces sulfu...
Terahertz frequency-domain characterization of UHMW-PE ballistic armor plates Candan, Can; Kocyigit, Kayrahan; Tiken, Mehmet; ŞAHİN, ASAF BEHZAT; Altan, Hakan; BERBEROĞLU, HALİL (2026-01-01) Ultra-high molecular weight polyethylene (UHMW-PE) fiber-based ballistic armor plates are analyzed in the terahertz (THz) frequency region to better understand their structural properties. Various thickness plates are prod...
Hydrolysis of Al for hydrogen production: A joint experimental and first-principles density functional theory investigation Mutlu, Rasiha Nefise; Eroğlu, Esra; Toffoli, Hande; Toffoli, Daniele; Jayaraman, Kandasamy; Karaca, Mehmet; Gökalp, İskender (2025-12-15) Efficient and environmentally friendly H2 production is one of the most pressing challenges that face modern energy science. Hydrolysis of water over metals is used as an affordable and sustainable method for H2 production...
Why teach quantum in your own time: the values of grassroots organizations involved in quantum technologies education and outreach Genenz, Ulrike; Anne, Neelanjana; KILIÇ, ZEYNEP; Mathews, Daniel; Ok, Oya; Schmidt, Adrian; Seskir, Zeki Can (2025-12-01) This paper examines the intersection of goals and values within grassroots organizations operating in the realm of quantum technologies (QT) education. It delineates a fundamental distinction between the objective to provi...
A case study: The negative THz time shift observed for Cu nanoparticle colloids Koral, Can; Ortaç, Bülend; Altan, Hakan (2025-12-01) We report a case study of the experimentally observed negative shift for the Copper nanoparticle colloids (NPs) when they are kept in contact with a quartz interface. This investigation is based on the previously reported ...
Optical gating in photodetector for femtosecond time-resolved imaging Kadan, Viktor; Dmytruk, Andriy; Bondar, Mykhailo; Dmytruk, Igor; Goodarzi, Arian; Akhtaryarazar, Darya; Pavlov, Ihor (2025-12-01) Non-degenerate two-photon femtosecond gating directly within a photosensor has been investigated in both external and internal photoeffect configurations, with the aim of enabling fast time-resolved imaging applications. T...
Ellipsometric study of TlInS<sub>2</sub> chalcogenide crystals: exploring their potential in nonlinear optics and optoelectronics Isik, M.; Hasanlı, Nızamı (2025-12-01) TlInS2 exhibits remarkable optical properties, making the compound strong candidate for next-generation optoelectronic and nonlinear optical (NLO) applications. In this study, linear and NLO characteristics of TlInS2 cryst...
A study of the effect of γ-radiation on electrophysical characteristics of Yb-doped GaS single crystal Madatov, R.S.; Turan, Raşit; Tagiev, T.B.; Khaligzadeh, A. Sh.; Genç, A.M.; Gulen, E.; Mamishova, R.M. (2025-12-01) Doping GaS single crystals with Yb atoms introduces donor and acceptor levels, which dramatically change the electrical conductivity in the temperature range 125–300 K. Additional defect levels are added by gamma irradiati...
Towards the double copy formulation for the Abelian sector of heterotic double field theory Yılmaz, Rasim (2025-11-01) It is known that the double field theory (DFT) action can be constructed perturbatively up to cubic order through the double copy of the Yang–Mills (YM) theory. This approach also extends to higher-derivative YM theories, ...
Instability and information production around Kerr black holes: effects on entropy and the shadow Tavlayan, Aydın; Tekin, Bayram (2025-11-01) Massless or massive particles in unstable orbits around a Kerr black hole exhibit exponentially unstable motion when perturbed. They either plunge into the black hole or escape to infinity after making some oscillations ar...
Performance of a Polarization Converter for 6G Applications İNCE, BERKAY; Koçyiğit, Kayrahan; AYTAÇ, BERAT; ŞAHİN, ASAF BEHZAT; Altan, Hakan (2025-11-01)
Tailoring the structural and optical properties of Mg-doped ZnO Thin films via sol-gel spin coating for ultraviolet optoelectronics Isik, M.; Yildirim, T.; Hasanlı, Nızamı (2025-11-01) This study reports the characterization of undoped and Mg-doped zinc oxide (ZnO) thin films obtained using the sol-gel spin-coating method. Zn1-xMgxO films with x = 0, 0.01, 0.03, 0.05, and 0.07 were successfully deposited...
Chern-Simons potentials of higher-dimensional Pontryagin densities Çakmak, Onur Ayberk; Sarıoğlu, Bahtiyar Özgür (2025-11-01) We develop a novel and systematic approach to computing the (2n-1)-form Chern-Simons (CS) potential given the Pontryagin density (PD), i.e. the nth Chern character, in arbitrary even dimensions D=2n >= 2. Throughout we wor...
Investigation of the polarization conversion efficiency of a metasurface-based converter for THz applications Altan, Hakan; AYTAÇ, BERAT; ŞAHİN, ASAF BEHZAT; Koçyiğit, Kayrahan; Şahin, Ömrüm; İNCE, BERKAY (2025-10-29)
Nondestructive inspection of UHMW-PE-based ballistic composites in the THz frequency range CANDAN, CAN; Koçyiğit, Kayrahan; TİKEN, MEHMET; ŞAHİN, ASAF BEHZAT; Altan, Hakan; BERBEROĞLU, HALİL (2025-10-29)
A deep-learning framework for concealed and unconcealed face analysis in sub millimeter wave imaging Bergman, Noam; YILDIRIM, İHSAN OZAN; ŞAHİN, ASAF BEHZAT; Altan, Hakan; Ytzhaky, Ytzhak (2025-10-27)
Study and reproducibility of the SRG/eROSITA background with particle rejection on and off Perinati, Emanuele; Freyberg, Michael J.; Pommranz, Christian; Serim, Muhammed Miraç; Yeung, Michael C. H.; Dennerl, Konrad; Friedrich, Susanne; Tenzer, Chris; Santangelo, Andrea (2025-10-01) For more than six years SRG/eROSITA is the first X-ray telescope in orbit around the second Lagrangian point in the Sun-Earth system. We present an updated study of its instrumental background based on cleaned data and imp...
Charmonium content of χc1(3872) in light-cone sum rules at twist 3 AKAN, TARIK; Olpak, Mehmet Ali; Özpineci, Altuğ (2025-10-01) In this study, we utilize light-cone QCD sum rules at twist-3 accuracy to compute the coupling parameters of the chi c1(2P) state with D and D* mesons. The analysis reveals that the observed chi c1(3872) meson incorporates...
Diffeomorphism invariance breaking in gravity and cosmological evolution Aydemir, Ufuk; Elbistan, Mahmut (2025-10-01) Diffeomorphism invariance breaking has been investigated in the literature in several contexts, including emergent General Relativity (GR). If GR emerges from an underlying theory without diffeomorphism invariance, there m...
Novel approaches for determining 30 MeV proton beam energy and dosimetric parameters using stopping power Yüksel, Zeynep; Tufan, Mustafa Çağatay; Mutuk, Tuğba; Gürbüz, Mevlüt; Bilmez, Bayram; Demirköz, Melahat Bilge (2025-10-01) In this study, a different semiempirical method has been developed to determine the beam energy, which is crucial point in experimental studies. For this purpose, the Bragg curve was determined both experimentally using ta...

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