Journal of the Korean Physical Society最新文献

{"title":"Erratum: Sensitivity of the r-process calculation to the alpha-decay rates and fission barriers","authors":"Nguyen Thi Thu Quyen, Nguyen Ngoc Duy, Nguyen Kim Uyen","doi":"10.1007/s40042-025-01337-2","DOIUrl":"10.1007/s40042-025-01337-2","url":null,"abstract":"","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 10","pages":"1024 - 1024"},"PeriodicalIF":0.8,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Erratum: Numerical modeling of gain-switched dysprosium-doped yellow fiber lasers","authors":"Iffat Ara Talin, Md. Ziaul Amin, Md. Abdus Samad","doi":"10.1007/s40042-025-01375-w","DOIUrl":"10.1007/s40042-025-01375-w","url":null,"abstract":"","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 10","pages":"1023 - 1023"},"PeriodicalIF":0.8,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Finite-temperature crossover in resistively shunted Josephson junctions via crossing approximations","authors":"Ha-Nul Seok,&nbsp;Aaram J. Kim","doi":"10.1007/s40042-025-01358-x","DOIUrl":"10.1007/s40042-025-01358-x","url":null,"abstract":"<div><p>We study the finite temperature behavior of the minimal model of the resistively shunted Josephson junction (RSJJ) using the crossing expansions, particularly the one-crossing approximation (OCA). For a simple benchmark model of the RSJJ, the OCA shows a good agreement with the (numerically) exact method up to deep strong coupling regime. The spin-spin correlation function obtained by the OCA reveals the finite-temperature crossover between the superconductor and the insulator for finite system-bath coupling and local anharmonicity. And the observed insulating regime clearly expands in the parameter space as the temperature is raised. The estimated crossover boundary is qualitatively consistent with the previously reported ground-state phase diagram (K. Masuki et. al, Phys. Rev. Lett. <b>129</b>, 087001 (2022)), but the quantitative values are sizably different. We discuss the possible origin of the deviations.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 10","pages":"981 - 988"},"PeriodicalIF":0.8,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Green synthesis, characterization and antimicrobial activity of silver nanoparticles by using Adiantum capillus-veneris as a reducing agent","authors":"Sarfraz Khan,&nbsp;Yousaf Iqbal,&nbsp;Waqar Hussain Shah,&nbsp;Muhammad Shahzad Ahmed,&nbsp;Xinman Chen,&nbsp;Mostafa R. Abukhadra,&nbsp;Ahmed M. El-Sherbeeny","doi":"10.1007/s40042-025-01349-y","DOIUrl":"10.1007/s40042-025-01349-y","url":null,"abstract":"<div><p>Green nanotechnology represents a recent advancement in nanoscience focusing on the biological synthesis of nanoparticles (NPs). This study utilized stem and leaf extracts from <i>Adiantum</i>, a medicinal plant, to reduce silver ions into silver nanoparticles (AgNPs). Green synthesis methods are considered non-toxic compared to conventional physical and chemical methods. The formation of AgNPs was monitored through color change and confirmed by UV–Vis spectroscopy. Various characterizations including Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and X-ray diffraction (XRD) were conducted. SEM analysis revealed that the particle size of AgNPs ranged from 40 to 80 nm, while XRD analysis indicated a particle size range of 14–18 nm. The antimicrobial activity of the synthesized NPs was evaluated, demonstrating significant toxicity against various bacterial strains. The highest inhibition zone of 18 mm was observed against <i>E. coli</i> (Gram-negative), followed by <i>Staphylococcus aureus</i> (17 mm), <i>Salmonella enterica</i> (15 mm), and <i>Pseudomonas aeruginosa</i> (08 mm), as well as considerable antioxidant activity against DPPH with 70% inhibition. Furthermore, the green synthesis method proved to be faster in production compared to chemical methods. These environmentally friendly NPs have potential applications in diverse fields including cosmetics, food, and medical industries.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 10","pages":"1003 - 1013"},"PeriodicalIF":0.8,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of high-k dielectrics on enhancement-mode AlGaN/GaN MISHEMTs: performance comparison with various buffer layers for RF power electronics","authors":"R. S. Venkatesan,&nbsp;M. Maria Dominic Savio,&nbsp;Ramkumar Natarajan,&nbsp;P. Murugapandiyan","doi":"10.1007/s40042-025-01360-3","DOIUrl":"10.1007/s40042-025-01360-3","url":null,"abstract":"<div><p>This research article investigates the performance implications of incorporating high-k dielectric hafnium oxide (HfO₂ ≈ 25) in enhancement-mode AlGaN/GaN high electron mobility transistors (HEMTs) with various AlGaN barrier mole function of 0.17 and 0.25 for high-speed RF power electronics using silicon carbide (SiC) substrate. This study also explores the influence of different buffer layer materials, such as AlGaN and β-Ga₂O₃ on device characteristics and reports a comparative analysis of DC and RF performance metrics. The use of a SiC substrate and buffer layer in GaN HEMTs significantly enhances device performance by increasing breakdown voltage, improving thermal stability, reducing defects and enhancing electron transport. The proposed heterostructure device Al_0.25Ga_0.75N/GaN with β-Ga₂O₃ buffer layer exhibited significantly higher drain current (I_D) of 2.67 A/mm, transconductance (g_m) of 1.204 S/mm, cut-off frequency (f_T) of 32.4 GHz, breakdown voltage (V_BR) of 1378 V compared to Al_0.25Ga_0.75N/GaN with AlGaN buffer HEMT. The proposed device drain current is 17% higher than the AlGaN buffer HEMT. The improved performance of devices with a SiC substrate and buffer layer opens new possibilities in various fields, such as power electronics, RF amplifiers, communication devices, aerospace, and defence applications.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 10","pages":"989 - 1002"},"PeriodicalIF":0.8,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of higher-order tidal corrections on the measurement accuracy of neutron star tidal deformability","authors":"Gyeongbin Park,&nbsp;Hee-Suk Cho,&nbsp;Chang-Hwan Lee","doi":"10.1007/s40042-025-01359-w","DOIUrl":"10.1007/s40042-025-01359-w","url":null,"abstract":"<div><p>Gravitational waves emitted by binary neutron stars (BNS) provide information about the internal structure of neutron stars (NSs), helping to verify dense matter equations of state. We investigate how the measurement accuracy of NS’s tidal deformability can be improved by incorporating the higher-order post-Newtonian (pN) tidal corrections up to 7.5 pN. We assume an aligned-spin BNS system and adopt TaylorF2, which is the most commonly used pN waveform model. To calculate the measurement error, we use a semi-analytic method, Fisher matrix, which is much faster than performing parameter estimation simulations. We employ Universal Relation to remove additional parameters that appear in higher-order corrections beyond 6 pN. We find that the effect of tidal corrections shows a convergent behavior with increasing pN orders. Assuming a fiducial binary NS system whose physical parameters are compatible with GW170817, we find that the measurement error of tidal deformability decreases linearly as the effective spin increases and the tidal deformability can be better measured for stiffer equation of states.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 10","pages":"1014 - 1022"},"PeriodicalIF":0.8,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of Cu-substitution on the dielectric properties and electronic structure of cobalt nanoferrites","authors":"P. J. Banshiwal,&nbsp;A. K. Meena,&nbsp;S. Chandra,&nbsp;D. Meena,&nbsp;M. K. Gora,&nbsp;S. P. Pareek,&nbsp;A. Kumar","doi":"10.1007/s40042-025-01364-z","DOIUrl":"10.1007/s40042-025-01364-z","url":null,"abstract":"<div><p>This work studied the dielectric characteristics and electronic structure of cobalt nanoferrites with Cu substitutions. Here, Cu_<i>x</i>Co_1–<i>x</i>Fe₂O₄ (0.0 ≤ <i>x</i> ≤ 1.0, in step <i>x</i> = 0.2) (CCFO) series was synthesized by utilizing the sol–gel self-combustion process. Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and an impedance analyzer were used to analyze each sample. FTIR Spectroscopy has confirmed the existence of one absorption band due to Fe–O interaction. Further nitrate group, the bending vibrations of H–O–H and carbonyl group were identified at 1380–1418 cm⁻¹, 1533–1581 cm⁻¹, and 2312–2360 cm⁻¹. Several vibrational modes were found in the material, which revealed three different Raman modes: <i>E</i>_g, <i>T</i>_2g, and <i>A</i>_1g. The elemental chemical states of CCFO nanoparticles were investigated employing XPS and exhibited the Fe, Co, and Cu atoms valence states are Fe³⁺, Co²⁺, Cu²⁺, and Cu⁺. Adding Cu²⁺ ions to these ferrites increased the metal oxide bonds and decreased the relative oxygen vacancy. The dielectric behavior of the proposed series is evaluated with frequencies between 100 Hz and 1 MHz, and the findings are then described in terms of the dielectric constant. As the frequency increased, the dielectric constant dropped and at more significant frequencies, it became constant. The results of the dielectric properties revealed that interfacial polarization causes the typical Maxwell–Wagner type dielectric dispersion. The study indicates that these materials may be used to manufacture microwave antennas to decrease energy losses and other purposes. It shows that distinct copper concentrations in cobalt ferrite nanoparticles could successfully alter their electronic and dielectric properties.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 10","pages":"969 - 980"},"PeriodicalIF":0.8,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal fluctuation of Fe-Ge ordering in Fe5-xGeTe2 single crystals","authors":"Nguyen Huu Lam,&nbsp;Trinh Thi Ly,&nbsp;Nguyen-Hoang Dang,&nbsp;Ganbat Duvjir,&nbsp;Hyo-Bin Ahn,&nbsp;Changgu Lee,&nbsp;Jungdae Kim","doi":"10.1007/s40042-025-01361-2","DOIUrl":"10.1007/s40042-025-01361-2","url":null,"abstract":"<div><p>Fe_5-xGeTe₂ is a magnetic van der Waals material with a relatively high Curie temperature near room temperature. Fe_5-xGeTe₂ exhibits unique magnetic properties due to its chemical and structural complexities. In this study, we employed scanning tunneling microscopy (STM) to investigate the thermal fluctuation of Fe-Ge ordering in Fe_5-xGeTe₂. At low temperatures (79 K), the Fe_5-xGeTe₂ surface exhibits distinct order with √3 × √3 periodicity resulting from the ordered Fe(1) atoms located in the outermost Fe₅Ge sublayer, while Fe deficient area shows 1 × 1 hexagonal lattice. At room temperature, on the other hand, structural fluctuations occur as thermal energy drives Fe(1) atom diffusion via a vacancy-mediated process. This results in the temporal rearrangement of the √3 × √3 and 1 × 1 regions at their boundaries. These findings provide important insights into the structural and magnetic properties of Fe_5-xGeTe₂.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 10","pages":"963 - 968"},"PeriodicalIF":0.8,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tensor network method for solving the Ising model with a magnetic field","authors":"Myung-Hoon Chung","doi":"10.1007/s40042-025-01350-5","DOIUrl":"10.1007/s40042-025-01350-5","url":null,"abstract":"<div><p>We study the two-dimensional square lattice Ising ferromagnet and antiferromagnet with a magnetic field by using tensor network method. Focusing on the role of gauge fixing, we present the partition function in terms of a tensor network. The tensor has a different symmetry property for ferromagnets and antiferromagnets. The tensor network of the partition function is interpreted as a multiple product of the one-dimensional quantum Hamiltonian. We perform infinite density matrix renormalization group to contract the two-dimensional tensor network. We present the numerical result of magnetization and entanglement entropy for the Ising ferromagnet and antiferromagnet side by side. To determine the critical line in the parameter space of the temperature and magnetic field, we use the half-chain entanglement entropy of the one-dimensional quantum state. The entanglement entropy precisely indicates the critical line forming the parabolic shape for the antiferromagnetic case, but shows the critical point for the ferromagnetic case.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 10","pages":"957 - 962"},"PeriodicalIF":0.8,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stability analysis of Bose gas: effect of external trapping and three-body interaction with Gross–Pitaevskii equation in Tonks–Girardeau regimes","authors":"Rajmohan Sasireka,&nbsp;Olivier Tiokeng Lekeufack,&nbsp;Ambikapathy Uthayakumar,&nbsp;Subramaniyan Sabari","doi":"10.1007/s40042-025-01354-1","DOIUrl":"10.1007/s40042-025-01354-1","url":null,"abstract":"<div><p>In this work, we investigate the stability aspects of quintic Gross–Pitaevskii (GP) equation with the presence and absence of external trapping potential for a Bose gas (BG) in both the Tonks–Girardeau (TG) and the super Tonks–Girardeau (sTG) regimes. For this purpose, we compute both analytically and numerically a pure quintic GP equation with the presence of the scattering lengths. Using the time-dependent variational approach, we derive the equations of motion and effective potential of the system for both cases. Through the effective potential, we discuss the stability properties of pure quintic GP equation and obtain the modulational instability condition of BECs. The variational results are verified by means of direct numerical simulations using split-step Crank–Nicolson method and the observed results are in agreement with the analytical predictions.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 10","pages":"945 - 956"},"PeriodicalIF":0.8,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}