Department of Physics, Article

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Development of a selective wet-chemical etchant for precise 3D sculpting of silicon enabled by infrared non-linear laser modification
Zolfaghari Borra, Mona; Radfar, Behrad; Nasser, Hisham; Çolakoğlu, Tahir; Tokel, Onur; Turnalı, Ahmet; Işık Taşgın, Dilek; Toffoli, Hande; Toffoli, Daniele; İlday, Fatih Ömer; Turan, Raşit; Pavlov, Ihor; Bek, Alpan (2024-09-01)
Recently-demonstrated high-quality three-dimensional (3D) subsurface laser processing inside crystalline silicon (c-Si) wafers opens a door to a wide range of novel applications in multidisciplinary research areas. Using t...
Influence of boron doping profile on emitter and metal contact recombination for n-PERT silicon solar cells
Bektaş, Gence; Aslan, Sercan; Keçeci, Ahmet Emin; Özyahni, Vahdet; Canar, Hasan Hüseyin; Asav, Hasan; Seyrek, Selin; Verlinden, Pierre J.; Turan, Raşit (2024-08-01)
Increasing interest in n-type silicon (Si) solar cells due to the high-quality material properties of the n-Si wafers, their relatively low sensitivity to donor-like impurities like iron and their resistance to light-induc...
Annealing-free, electron-selective ohmic contacts using zirconium oxide and aluminum for n-type crystalline silicon solar cells
Madbouly, Loay Akmal; Nasser, Hisham; Borra, Mona Zolfaghari; Çiftpınar, Emine Hande; Altiner, Gokhan; Aliefendioglu, Atescan; Canar, Hasan Huseyin; Turan, Raşit; Ünalan, Hüsnü Emrah (2024-06-15)
The challenge of Fermi-level pinning significantly complicates the establishment of Ohmic, low-resistance contacts for lightly doped n-type crystalline silicon (c-Si), a critical requirement for economically feasible devic...
The expected potential of hadronic PeVatron searches with spectral γ-ray data from the Southern Wide-field Gamma-ray Observatory
Angüner, Ekrem Oğuzhan; Ergin, Tülün (2024-06-01)
The presence of a spectral softening, occurring at ∼3 PeV energies, seen in the local cosmic-ray energy spectrum provides an evidence that our Galaxy hosts astrophysical objects, known as ’hadronic PeVatrons’, that are cap...
QCD sum rule study of <i>J</i> <SUP> <i>P</i> </SUP>=1<SUP>±</SUP> exotic states with two heavy quarks in the molecular picture
Alıyev, Tahmasıb; Bilmiş, Selçuk; Savcı, M. (2024-06-01)
In this study, the spectroscopic parameters of exotic molecular states composed of mesons containing two heavy quarks (scalar - axial and pseudoscalar - axial meson combinations) are investigated within the QCD sum rules. ...
Performance analysis of CuSbSe2 thin-film solar cells with Cd-free window layers
SÜRÜCÜ, GÖKHAN; Bal, Ersin; Gencer, Aysenur; Parlak, Mehmet; Surucu, Ozge (2024-05-15)
This study investigates novel thin-film solar cells featuring CuSbSe2 (CASe) with ZnSnO and ZnMgO windows in the layer superstrate structure. For glass/ITO/ZnMgO/CASe/Cu + Au, the J-V measurements reveal a short-circuit cu...
Coupling Constants as Conserved Charges in Black Hole Thermodynamics
Hajian, Kamal; Tekin, Bayram (2024-05-10)
In a generic theory of gravity coupled to matter fields, the Smarr formula for black holes does not work properly if the contributions of the coupling constants defining the theory are not incorporated. However, these coup...
Scaling symmetry, Smarr relation, and the extended first law in lower-dimensional Lovelock gravity
Alkaç, Gökhan; Özen, Gökçen Deniz; Özşahin, Hikmet; Süer, Gün; Tek, Mustafa (2024-05-01)
Recently, it was discovered that lower-dimensional versions of Lovelock gravity exist as scalar-tensor theories that are examples of Horndeski gravity. We study the thermodynamics of the static black hole solutions in thes...
Revealing photoluminescence and nonlinear optical absorption characteristics of PbMo0.75W0.25O4 single crystal for optical limiting applications
Doğan, Anıl; Karatay, Ahmet; Isik, Mehmet; Yıldız, Elif; Hasanlı, Nızamı; Elmalı, Ayhan (2024-05-01)
Nonlinear absorption properties of PbMo0.75W0.25O4 single crystal fabricated by the Czochralski method were studied. The band gap energy of the crystal was determined as 3.12 eV. Urbach energy which represents the defect s...
Insights into Reaction Mechanisms in Liquid Metals from Density Functional Theory: CH4 Pyrolysis in BiNiX (X = Cu, Al) Molten Metals as a Case Study
Erbasan, Arda; Toffoli, Hande; Toffoli, Daniele; Gökalp, İskender; KARDAŞ, GÜLFEZA; Çelik, Gökhan (2024-04-22)
Pyrolysis of methane using molten metal catalysts in bubble column reactors presents a cleaner and coking-free alternative for hydrogen production from natural gas due to its lack of direct CO2 emissions. Bubble column rea...
Regularized Weyl double copy
Alkaç, Gökhan; Gümüş, Mehmet Kemal; Kaşlkçl, Oǧuzhan; Olpak, Mehmet Ali; Tek, Mustafa (2024-04-15)
We propose a regularization procedure in the sourced Weyl double copy, a spinorial version of the classical double copy, such that it matches much more general results in the Kerr-Schild version. In the regularized Weyl do...
Temperature-dependent tuning of band gap of Fe3O4 nanoparticles for optoelectronic applications
Delice, S.; Isik, M.; Hasanlı, Nızamı (2024-04-01)
We have investigated structural, morphological and temperature dependent absorption characteristics of Fe3O4 nanoparticles. X-ray diffraction pattern exhibited six diffraction peaks belonging to the cubic phase structure w...
A theoretical study on quasifission and fusion–fission processes in heavy-ion collisions
Kayaalp, A.; Ocal, S.E.; Yaprakli, B.; Arık, Mert; Yılmaz, Osman; Umar, A.S. (2024-04-01)
The stochastic mean-field (SMF) technique beyond the time-dependent-Hartree-Fock approach is used to explore the primary mass yields of quasifission fragments in the 58Fe+208Pb reaction at the bombarding energy Ec.m. = 238...
Voltage-controlled extraordinary optical transmission in the visible regime
Asif, Hira; Bek, Alpan; TAŞGIN, MEHMET EMRE; ŞAHİN, RAMAZAN (2024-03-15)
Control of components in integrated photonic circuits is crucial in achieving programmable devices. Operation bandwidth of a plasmonic device cannot be generally tuned once it is manufactured, especially in the visible reg...
Mass formulas for individual black holes in merging binaries
Ozkarsligil, Zeynep Tugce; Tekin, Bayram (2024-03-01)
We give formulas for individual black hole masses in a merger, by using Newtonian physics, in terms of the three measured quantities in the detector: the initial wave frequency f 1, the maximum detected frequency (chirp fr...
Reanalysis of rare radiative Ξb- → Ξ-γ decay in QCD
Alıyev, Tahmasıb; Özpineci, Altuğ; Sarac, Y. (2024-03-01)
The upper limit of the branching ratio of the rare Ξb-→Ξ-γ decay is obtained as BR(Ξb-→Ξ-γ)<1.3×10-4 by the LHCb. In the present work we study this decay within the light cone QCD sum rules employing the Ξb distribution am...
Revealing defect centers in PbWO4 single crystals using thermally stimulated current measurements
Isik, M.; Hasanlı, Nızamı (2024-02-28)
The trap centers have a significant impact on the electronic properties of lead tungstate (PbWO4), suggesting their crucial role in optoelectronic applications. In the present study, we investigated and revealed the presen...
Exciton related nonlinear optical properties of a quantum wire
Ustoglu Unal, V.; Tomak, Mehmet; Zorlu, O.; Aksahin, E. (2024-02-15)
A considerable amount of work is done on nonlinear optical properties in quantum wells and dots. However, relatively fewer work is done on both quantum well wires and the excitonic effects. This work analyzes the excitonic...
Nonstationary energy of perfect fluid sources in general relativity
Altas, Emel; Tekin, Bayram (2024-02-15)
The Arnowitt-Deser-Misner (ADM) energy for asymptotically flat spacetimes or its generalizations to asymptotically nonflat spacetimes measure the energy content of a stationary spacetime, such as a single black hole. Such ...
Effect of the cathode surface temperature on the cathode fall layer parameters: experiment and simulation
Simonchik, Leanid; Tomkavich, Mikalai; Islamov, Gubad; Eylenceoglu, Ender; Rafatov, İsmail (2024-02-01)
Combined experimental and numerical studies reveal a significant effect of the cathode temperature on the basic parameters (such as the electric field profile, thickness of the cathode fall layer, current density, and gas ...
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