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Sholihun, Sholihun
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Physics

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STUDY OF DOS (DENSITY OF STATE) OF HALIDE PEROVSKITES CH3NH3PbI3 USING TROTTER-SUZUKI TIME PROPAGATION METHOD Perdana, Teguh Iman; Sholihun, Sholihun; Santoso, Imam
JOURNAL ONLINE OF PHYSICS Vol. 10 No. 2 (2025): JOP (Journal Online of Physics) Vol 10 No 2
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v10i2.41224

Abstract

This study investigates the electronic properties of CH₃NH₃PbI₃ using the tight-binding time propagation method (TB-TPM) combined with the Trotter-Suzuki decomposition. The research focuses on computing the density of states (DOS) for various system sizes and time step parameters, employing a real-space approach to model the electronic structures of the material. Considering only the s-orbitals of Pb and I atoms reduces the computational complexity, enabling efficient simulations. The results indicate a metallic behavior, deviating from the expected semiconducting properties reported in prior studies due to the exclusion of critical p-orbital interactions. The study also highlights the effect of timestep size on the accuracy of the correlation functions and DOS, emphasizing the need for smaller timesteps to resolve spectral features effectively.
SIMULASI NUMERIK TUMBUKAN DUA PROYEKTIL DI UDARA Yuliani, Rohma; Saifullah, Khalid; Purnomo, Agus Dwi; Jehadu, Valerianus; Sholihun, Sholihun
JOURNAL ONLINE OF PHYSICS Vol. 10 No. 3 (2025): JOP (Journal Online of Physics) Vol 10 No 3
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v10i3.45624

Abstract

Penelitian ini menyajikan model komputasi untuk analisis intersepsi proyektil dengan mempertimbangkan gaya hambat udara kuadratik (Fd ∝ ). Persamaan gerak dimodelkan sebagai Persamaan Diferensial Biasa (PDB) dan diselesaikan secara numerik menggunakan metode Runge-Kutta orde 4/5. Sudut peluncuran proyektil penembak dioptimalkan untuk meminimalkan jarak terhadap target menggunakan algoritma optimasi. Hasil menunjukkan model berhasil menentukan sudut peluncuran optimal untuk mencapai intersepsi. Visualisasi mengkonfirmasi lintasan non-parabola yang khas akibat hambatan udara, yang secara signifikan mengurangi jangkauan proyektil. Model ini terbukti menjadi alat analisis yang efektif dan akurat untuk memprediksi lintasan dalam skenario intersepsi yang realistis. Kata Kunci: Simulasi, Gerak Proyektil, Gaya Hambat Udara, Python
LINTASAN BOLA BERMUATAN BERPUTAR DALAM MEDAN MAGNET DENGAN PENGARUH EFEK MAGNUS Fanleon, Chandra; Hidayat, Aldi Nur; Tamsil, Tamsil; Trifina, Leonora Livi Riza; Sholihun, Sholihun
JOURNAL ONLINE OF PHYSICS Vol. 10 No. 3 (2025): JOP (Journal Online of Physics) Vol 10 No 3
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v10i3.46178

Abstract

Penelitian ini menganalisis lintasan bola konduktor bermuatan dan netral dalam medan elektromagnetik tidak homogen dengan efek Magnus melalui simulasi numerik. Metode Runge-Kutta orde 4/5 diaplikasikan untuk menyelesaikan persamaan diferensial gerak yang melibatkan interaksi gaya Lorentz, Magnus, dan Gravitasi. Hasil simulasi menunjukkan perbedaan signifikan pada lintasan bola: kasus bermuatan (q = 1.0 C) membentuk heliks kompleks dengan displacement horizontal 12.5 m dan variasi ketinggian 3.8m akibat kopling elektromagnetik- rotasional, sedangkan kasus netral (q =0 C) menghasilkan lintasan parabola sederhana dengan displacement 2.3 m. Analisis gaya Magnus menunjukkan amplitudo osilasi lebih besar pada benda bermuatan, menegaskan pengaruh medan magnet terhadap energi rotasi.
COMPARATIVE STUDY OF EOS (EQUATION OF STATES) MODELS FOR FITTING ENERGY VERSUS VOLUME DATA IN THERMODYNAMICS Bandhaso, David; Lukmantoro, Arif; Sholihun, Sholihun
JOURNAL ONLINE OF PHYSICS Vol. 9 No. 2 (2024): JOP (Journal Online of Physics) Vol 9 No 2
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v9i2.31973

Abstract

One of the essential aspects of material design research is studying the stability of the model designed. In Thermodynamics, material stability can be expressed by the equation of state (EOS). However, not all EoS will fit with the energy versus volume data from the material being designed. Moreover, if the materials prepared have a unique structure, more factors need to be considered so that the data fitting is carried out more precisely. In this research, a comparative study of 1 mathematical approach (second order polynomial) and 4 EoS (Murnaghan EoS, Birch EoS, Birch EoS, Birch-Murnaghan EoS, and Vinet EoS) was carried out for fitting energy versus volume data on 3D (bulk) and 2D materials. obtained from density functional theory (DFT) calculations. This research found that fitting energy versus volume data in 3D material models can be done using second-order polynomials. In contrast, for 2D models, only two EoS fit (Birch-Murnaghan and Vinet). Apart from that, the result is that the Vinet equation of state is an equation that has the smallest tolerance value in the range of 10-4 - 10-10 eV
Co-Authors Bandhaso, David Fanleon, Chandra Hidayat, Aldi Nur Imam Santoso Jehadu, Valerianus Lukmantoro, Arif Perdana, Teguh Iman Purnomo, Agus Dwi Saifullah, Khalid Tamsil Tamsil Trifina, Leonora Livi Riza Yuliani, Rohma