Journal of the Korean Physical Society最新文献

High-performance GaN-based HEMTs with β-Ga2O3 buffer layer engineering for millimeter-wave applications 具有β-Ga2O3缓冲层的高性能gan基hemt用于毫米波应用

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-07-16 DOI: 10.1007/s40042-025-01442-2

K. Nirmala Devi, G. Keerthiga, S. Ravi, P. Murugapandiyan

{"title":"High-performance GaN-based HEMTs with β-Ga2O3 buffer layer engineering for millimeter-wave applications","authors":"K. Nirmala Devi, G. Keerthiga, S. Ravi, P. Murugapandiyan","doi":"10.1007/s40042-025-01442-2","DOIUrl":"10.1007/s40042-025-01442-2","url":null,"abstract":"<div>This article presents a comprehensive theoretical analysis of device characteristics achievable through innovative channel engineering and buffer layer optimization using validated TCAD simulation models. The AlGaN/InGaN/GaN HEMT (LG = 55 nm) demonstrates impressive performance metrics, including a sheet carrier density of 2.6 × 1013 cm−2, on-resistance of 0.31 Ω.mm, and maximum drain current density of 3.14 A/mm. The device achieves a peak transconductance of 0.71 S/mm and exhibits robust breakdown characteristics with a three-terminal off-state breakdown voltage of 96.8 V. In addition, it maintains an excellent ION/IOFF ratio of 1013 and demonstrates outstanding frequency performance with fT/fmax values of 285/310 GHz. The InAlN/InGaN/GaN architecture shows enhanced performance parameters, featuring a higher sheet carrier density of 3.9 × 1013 cm−2, reduced on-resistance of 0.25 Ω.mm, and increased drain current density of 5.22 A/mm. This configuration achieves a peak transconductance of 0.74 S/mm, while maintaining a breakdown voltage of 57.1 V and an ION/IOFF ratio of 1013. Notably, it demonstrates superior frequency characteristics with fT/fmax values reaching 311/364 GHz. These results highlight the potential of β-Ga2O3 buffer engineering in advancing GaN HEMT technology for next-generation millimeter-wave applications.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 6","pages":"787 - 808"},"PeriodicalIF":0.9,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090277","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}

引用次数: 0

Research and application of machine learning methods in X-ray in-situ calibration 机器学习方法在x射线原位标定中的研究与应用

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-07-16 DOI: 10.1007/s40042-025-01422-6

Yang Xu, Chen Luo, Yu Jiang, Fei Gao, Ke-Bin Jia, Yan Huang, Min Lin

{"title":"Research and application of machine learning methods in X-ray in-situ calibration","authors":"Yang Xu, Chen Luo, Yu Jiang, Fei Gao, Ke-Bin Jia, Yan Huang, Min Lin","doi":"10.1007/s40042-025-01422-6","DOIUrl":"10.1007/s40042-025-01422-6","url":null,"abstract":"<div>The correction of environmentally scattered radiation and rapid determination of the dose rate at test points are important issues in the in-situ calibration of fixed X- and γ-ray radiation dosimeters with open X-ray reference radiation fields. In this study, a Monte Carlo calculation model of the environmentally scattered radiation for in-situ calibration was established, the environmental parameters that may affect scattered radiation under two calibration scenarios were systematically analyzed, and datasets were constructed. Three machine learning algorithms, Support Vector Regression (SVR), Adaptive Boosting (AdaBoost) and Gradient Boosting Regression Tree (GBRT), were used to establish a scattering factor prediction model, evaluate the prediction performance of the model in test sets and experiments, and carry out the application of in-situ calibration of typical dosimeters. The GBRT was found to have better comprehensive performance than the SVR and AdaBoost prediction models did, the GBRT was able to predict the scattering factor on the test set without exceeding the Mean Square Error (MSE) of 1.16E−04, the Root Mean Square Error (RMSE) of 1.08E−02 and the Mean Absolute Error (MAE) of 8.53E−03, respectively, and with R2 converging to 1. The maximum relative deviation of the scattering factor in the experiments was −6.9%. This study provides an intelligent method for dose determination in the in-situ calibration of fixed dosimeters, which can be extended to more complex calibration scenarios by expanding the database. At the same time, it provides a feasible idea for replacing isotope radiation sources with X-ray sources.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 6","pages":"821 - 832"},"PeriodicalIF":0.9,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090279","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}

引用次数: 0

Improving object density determination in coherent diffraction imaging by preprocessing truncated discrete diffraction amplitudes 通过对截断的离散衍射幅值进行预处理，改进相干衍射成像中物象密度的确定

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-07-16 DOI: 10.1007/s40042-025-01437-z

Ouyoung Kwon, Do Young Noh, Yoonhee Kim, Chan Kim

引用次数: 0

The RAON facility: an overview RAON设施：概述

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-07-15 DOI: 10.1007/s40042-025-01435-1

Sukjin Choi, Yeon Sei Chung, In-Seok Hong, Jinho Lee, Yoochul Jung, Youngman Kim, Myeun Kwon, Taeksu Shin, Seung-Woo Hong

{"title":"The RAON facility: an overview","authors":"Sukjin Choi, Yeon Sei Chung, In-Seok Hong, Jinho Lee, Yoochul Jung, Youngman Kim, Myeun Kwon, Taeksu Shin, Seung-Woo Hong","doi":"10.1007/s40042-025-01435-1","DOIUrl":"10.1007/s40042-025-01435-1","url":null,"abstract":"<div>The Rare Isotope Science Project (RISP) was launched to construct a new facility called RAON (Rare isotope Accelerator complex for ON-line experiments), dedicated to advancing nuclear physics and rare isotope science. The project is motivated for studying and utilizing rare isotopes for a wide range of applications, including fundamental nuclear physics, nuclear astrophysics, materials science, and biomedical research. RAON is uniquely designed to incorporate both isotope separation on-line (ISOL) and in-flight fragmentation (IF) methods, and combining the ISOL and IF methods to produce more exotic rare isotopes. With the first phase of the project completed, this paper documents the major milestones of the facility’s construction progress. The key technical achievements, including the commissioning of major components such as the cryogenic system, superconducting linear accelerator, and ISOL system, are highlighted. Recently, a major milestone was achieved with the first acceleration of an ISOL-produced rare isotope beam, successfully delivering a 25Na beam at 16.4 MeV/u. This paper provides an overview of RISP’s technical progress and achievements made to date.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 5","pages":"447 - 454"},"PeriodicalIF":0.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144914708","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}

引用次数: 0

Adjoint-based optimization of quadratic metalenses for wide field-of-view applications 大视场应用中二次元透镜的伴随优化

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-07-15 DOI: 10.1007/s40042-025-01441-3

Yiwei Zhang, Yongle Zhou, Juntao Li

引用次数: 0

Effect of annealing temperature on structural and optical properties of WO3:Yb3+, Er3+ upconversion phosphors by high-energy wet ball milling 退火温度对高能湿球磨WO3:Yb3+， Er3+上转换荧光粉结构和光学性能的影响

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-07-15 DOI: 10.1007/s40042-025-01424-4

In Cheol Hwang, HyeonJun Jung, Gyeong Bok Jung

{"title":"Effect of annealing temperature on structural and optical properties of WO3:Yb3+, Er3+ upconversion phosphors by high-energy wet ball milling","authors":"In Cheol Hwang, HyeonJun Jung, Gyeong Bok Jung","doi":"10.1007/s40042-025-01424-4","DOIUrl":"10.1007/s40042-025-01424-4","url":null,"abstract":"<div>Yb3+ and Er3+-co-doped WO3 upconversion phosphors (WO3:Yb3+, Er3+ UCPs) were successfully synthesized using a high-energy wet ball milling method. The structural and optical properties of the phosphors were systematically examined at various annealing temperatures. X-ray diffraction (XRD) patterns confirmed that all samples corresponded to the monoclinic WO3 phase without any secondary phases. Both the XRD and Raman peak intensities increased as the annealing temperature increased, indicating enhanced crystallinity. Similarly, photoluminescence (PL) emission intensity was positively correlated with annealing temperature. Under 980 nm excitation, PL spectra exhibited strong green emissions at 522 and 546 nm, and a weaker red emission at 654 nm, corresponding to the Er3+ transitions of 2H11/2 → 4I15/2, 4S3/2 → 4I15/2, and 4F9/2 → 4I15/2, respectively. Notably, at 522 nm, the intensity of PL spectra for the sample annealed at 1000 ℃ was approximately five times that of the sample annealed at 400 ℃. </div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 6","pages":"744 - 750"},"PeriodicalIF":0.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090674","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}

引用次数: 0

Performance enhancement in solution-processed indium–tin–zinc-oxide thin-film transistors through annealing temperature modulation and multilayer stacking 通过退火温度调制和多层堆叠提高溶液法制备铟锡锌氧化物薄膜晶体管的性能

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-07-15 DOI: 10.1007/s40042-025-01439-x

Narendra Naik Mude, Akash Bharat More, Yu-Jung Cha, Sung-Woon Cho

{"title":"Performance enhancement in solution-processed indium–tin–zinc-oxide thin-film transistors through annealing temperature modulation and multilayer stacking","authors":"Narendra Naik Mude, Akash Bharat More, Yu-Jung Cha, Sung-Woon Cho","doi":"10.1007/s40042-025-01439-x","DOIUrl":"10.1007/s40042-025-01439-x","url":null,"abstract":"<div>Amorphous metal–oxide–semiconductor (MOS)-based thin-film transistors (TFTs) are gaining attention because of their favorable electrical performance and better operational stability than conventional amorphous silicon semiconductors. This study investigates the impact of the annealing temperature and multilayered structures on the performance and stability of indium–tin–zinc-oxide (ITZO) TFTs. ITZO semiconductors are fabricated under annealing temperatures of 350, 400, and 450 °C to improve the quality of metal–oxide–metal (M–O–M) bonding networks and reduce defect states. Single-, bi-, and tri-layer film configurations are used to optimize the device’s performance and stability. TFTs fabricated at 400 °C with a bi-layer coating show superior device performance and operational stability owing to superior M–O–M bonding networks and reduced charge-trapping characteristics compared to other cases. These results emphasize the importance of annealing temperature and layer thickness in achieving a high mobility, low threshold voltage, and device stability for next-generation display technologies.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 6","pages":"778 - 786"},"PeriodicalIF":0.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090241","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}

引用次数: 0

Significance of Yamada–Ota and Xue models in shear flow analysis of hybrid nanofluids within converging boundary layers of varying strengths Yamada-Ota和Xue模型在变强度收敛边界层内混合纳米流体剪切流动分析中的意义

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-07-15 DOI: 10.1007/s40042-025-01434-2

S. Goher, Z. Abbas, M. Y. Rafiq

{"title":"Significance of Yamada–Ota and Xue models in shear flow analysis of hybrid nanofluids within converging boundary layers of varying strengths","authors":"S. Goher, Z. Abbas, M. Y. Rafiq","doi":"10.1007/s40042-025-01434-2","DOIUrl":"10.1007/s40042-025-01434-2","url":null,"abstract":"<div>This study investigates the impact of thermal radiation on the shear flow of two immiscible water-based hybrid nanofluids containing carbon nanotubes, confined within converging boundary layers of unequal strengths. The analysis focuses on comparing two widely used thermal conductivity models, namely, the Yamada–Ota and Xue models for hybrid nanofluids composed of single-walled (SWCNTs) and multi-walled carbon nanotubes (MWCNTs). By applying appropriate similarity transformations, the governing partial differential equations are reduced to a set of nonlinear ordinary differential equations, which are solved numerically using MATLAB's bvp4c solver. The effects of key parameters, including viscosity ratio, thermal conductivity ratio, radiation, and Schmidt number on velocity, temperature, and concentration fields, are examined in detail. Results demonstrate that the Xue model predicts a steeper temperature gradient compared to the Yamada–Ota model, and that increasing the Schmidt number reduces mass transfer in both fluid layers. The comparative analysis provides valuable insights for optimizing thermal and mass transport in stratified flow systems, with potential applications in microchannel heat exchangers, layered cooling devices, and energy systems.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 6","pages":"764 - 777"},"PeriodicalIF":0.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090675","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}

引用次数: 0

Heat management strategy for hybrid-bonded wafers using MgO interlayer dielectric MgO层间介质混合键合晶圆的热管理策略

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-07-09 DOI: 10.1007/s40042-025-01427-1

Anh-Duy Nguyen, Geon Park, Hyunsoo Kim, An Hoang-Thuy Nguyen, Manh-Cuong Nguyen, Rino Choi

{"title":"Heat management strategy for hybrid-bonded wafers using MgO interlayer dielectric","authors":"Anh-Duy Nguyen, Geon Park, Hyunsoo Kim, An Hoang-Thuy Nguyen, Manh-Cuong Nguyen, Rino Choi","doi":"10.1007/s40042-025-01427-1","DOIUrl":"10.1007/s40042-025-01427-1","url":null,"abstract":"<div>As the features of metal oxide semiconductor field-effect transistor (MOSFET) devices are aggressively scaled down, 3-dimensional (3D) integration is receiving significant attention for further semiconductor technology development. While hybrid bonding is a promising solution for 3D integration because it can achieve high interconnect density, thermal management of bonded dies would be a potential problem. The thermal conductivity of the interlayer dielectric is crucial for effective thermal management. With high thermal conductivity and low fabrication temperature, magnesium oxide (MgO) is one of the attractive dielectric interlayers. However, due to the high dielectric constant, crosstalk degradation is a major challenge for MgO implementation. This study proposes various strategies for MgO implementation. 2-dimensional technology, computer-aided-design, and transient thermal simulation have been utilized to investigate MgO performance as an interlayer dielectric. At the same time, the finite element method has been used to study the tradeoff with crosstalk performance. The simulated results reveal that the device operating temperature can be reduced to 7 °C by applying a MgO layer in SiO2 intermetal dielectric, with a thickness ratio ranging from 20 to 40%. MgO single-layer implementation as a heat-conducting channel has also been studied. M4, M5, or M6 are recommended for high thermal conductivity and low crosstalk tradeoff. This study demonstrates that an optimized usage of MgO layer in the back-end-of-line can minimize crosstalk degradation while maintaining heat dissipation enhancement. These results suggest that MgO interlayer can be an attractive solution to the local heating issue in high-performance applications.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 6","pages":"809 - 820"},"PeriodicalIF":0.9,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090252","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}

引用次数: 0

Analyzing challenges of the Foucault pendulum experiment in school and strategies for successful implementation 分析福柯摆实验在学校面临的挑战及成功实施的策略

IF 0.9 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-07-08 DOI: 10.1007/s40042-025-01432-4

Da Won Jung, Kyung Suk Lee

{"title":"Analyzing challenges of the Foucault pendulum experiment in school and strategies for successful implementation","authors":"Da Won Jung, Kyung Suk Lee","doi":"10.1007/s40042-025-01432-4","DOIUrl":"10.1007/s40042-025-01432-4","url":null,"abstract":"<div>The Foucault pendulum is a highly educational experiment that provides a visible demonstration of Earth’s rotation—something difficult to perceive in everyday life. However, unlike the specially crafted Foucault pendulums exhibited in science museums, it is not easy for students to observe the precession caused by Earth’s rotation employing a simply constructed spherical pendulum made by themselves. Here, we theoretically explained that it was challenging because the precession of the spherical pendulum erased the precession caused by Earth’s rotation. We also supported this explanation by actual experimental data from our own simple pendulum. Moreover, based on this empirical and theoretical understanding, we focused on minimizing the initial angular velocity, the primary factor that makes it difficult to observe the Foucault pendulum’s precession, and successfully demonstrated Earth’s rotation. We hope that our investigation would help students carry out their own Foucault pendulum experiments and probe Earth’s rotation for themselves in a typical school setting without requiring any specialized equipment.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"87 6","pages":"729 - 737"},"PeriodicalIF":0.9,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090665","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}

引用次数: 0