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The propagation of nonlinear waves in field-effect transistors with quantum effects 具有量子效应的场效应晶体管中非线性波的传播
IF 0.8 4区 物理与天体物理
Journal of the Korean Physical Society Pub Date : 2024-06-25 DOI: 10.1007/s40042-024-01129-0
Liping Zhang, Yunqing Yang, Jiangxu Feng, Meilin Zhang
{"title":"The propagation of nonlinear waves in field-effect transistors with quantum effects","authors":"Liping Zhang,&nbsp;Yunqing Yang,&nbsp;Jiangxu Feng,&nbsp;Meilin Zhang","doi":"10.1007/s40042-024-01129-0","DOIUrl":"10.1007/s40042-024-01129-0","url":null,"abstract":"<div><p>Shock and solitary waves are very important nonlinear structure in the channel of field-effect transistors (FET). In this paper, the propagation of shock and solitary waves with quantum effects in the channel of FET is investigated. Using reductive perturbation expansion, the quantum hydrodynamic equations are reduced to KdV–Burgers and KdV equations describing the characteristic of shock and solitary waves with quantum effects in the channel of FET. The analytical and numerical results show that there are two different types of shock waves and solitary waves in this system; the monotone shock waves, the oscillatory waves and the solitary waves can transform each other under certain condition; the quantum effects strengthened shock waves oscillation and change the width of the solitary waves. This finding provides a new idea for finding efficient THz radiation sources and opens up a new mechanism for the development of THz technology.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 5","pages":"421 - 430"},"PeriodicalIF":0.8,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503165","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
Combinatorial study of coherent multi-channel phase-locking based on covariance matrix adaptation evolution strategy 基于协方差矩阵适应演化策略的相干多通道锁相的组合研究
IF 0.8 4区 物理与天体物理
Journal of the Korean Physical Society Pub Date : 2024-06-25 DOI: 10.1007/s40042-024-01131-6
Hansol Kim, Minsu Yeo, Yoonchan Jeong
{"title":"Combinatorial study of coherent multi-channel phase-locking based on covariance matrix adaptation evolution strategy","authors":"Hansol Kim,&nbsp;Minsu Yeo,&nbsp;Yoonchan Jeong","doi":"10.1007/s40042-024-01131-6","DOIUrl":"10.1007/s40042-024-01131-6","url":null,"abstract":"<div><p>This study explores the performance and channel-scalability of the covariance matrix adaptation evolution strategy (CMA-ES)-based coherent optical phase control algorithm for coherent beam combining (CBC) systems. Leveraging the probabilistic nature of its optimization process, the CMA-ES algorithm emerges as a promising candidate for a next-generation phase control algorithm for CBC systems. To assess its functionality and channel-scalability, we conduct numerical investigations into the CMA-ES-based phase control algorithm applied to both 37- and 61-channel CBC systems with varying its algorithmic parameters. For the 37-channel configuration, consistent results demonstrate an average beam combining efficiency (BCE) exceeding 0.9, with a constrained standard deviation of 0.1 with phase sample numbers surpassing 30. The analysis of the time complexity reveals that the CMA-ES-based algorithm efficiently converges to a BCE value of 0.9 within a 10 MHz bandwidth within a 5 μs atmospheric time scale. In the case of the 61-channel configuration, a majority of phase samples exhibit an average BCE exceeding 0.95, with a small number of trials slightly falling below 0.85 yet still achieving a BCE of approximately 0.8. Similar to the 37-channel case, with the bandwidth &lt; 12 MHz, the CMA-ES-based algorithm can give rise to the BCE level of 0.9 within a 5 μs atmospheric time duration.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 5","pages":"406 - 414"},"PeriodicalIF":0.8,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141528285","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
A study on sheath structure in discharge and diffusion region of a double plasma device 双等离子体设备放电区和扩散区的鞘结构研究
IF 0.8 4区 物理与天体物理
Journal of the Korean Physical Society Pub Date : 2024-06-25 DOI: 10.1007/s40042-024-01122-7
Mrinal Kr. Mishra, Arindam Phukan, Monojit Chakraborty
{"title":"A study on sheath structure in discharge and diffusion region of a double plasma device","authors":"Mrinal Kr. Mishra,&nbsp;Arindam Phukan,&nbsp;Monojit Chakraborty","doi":"10.1007/s40042-024-01122-7","DOIUrl":"10.1007/s40042-024-01122-7","url":null,"abstract":"<div><p>The article reports about the variation of an ion sheath thickness in discharge and diffusion plasma. Two ion sheaths are formed at two negatively biased plates placed in discharge and diffusion region of a double plasma device. Plasma is only produced in one section of the device by hot filament discharge and there is no filament in the other section. When energy of primary electrons is increased, ion sheath in discharge region expands and it contracts in the diffusion region. For an increase in population of primary electrons, an ion sheath in both discharge and diffusion region contracts. Again, for drainage of electrons or ions from discharge region, the sheath structure in discharge region is highly influenced by the plasma potential whereas in diffusion region; sheath structure is mainly influenced by local plasma density.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 2","pages":"147 - 155"},"PeriodicalIF":0.8,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141528283","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
Boundary effect and correlations in fermionic Gaussian states 费米高斯态的边界效应和相关性
IF 0.8 4区 物理与天体物理
Journal of the Korean Physical Society Pub Date : 2024-06-24 DOI: 10.1007/s40042-024-01126-3
Jinhyeok Ryu, Jaeyoon Cho
{"title":"Boundary effect and correlations in fermionic Gaussian states","authors":"Jinhyeok Ryu,&nbsp;Jaeyoon Cho","doi":"10.1007/s40042-024-01126-3","DOIUrl":"10.1007/s40042-024-01126-3","url":null,"abstract":"<div><p>The effect of boundaries on the bulk properties of quantum many-body systems is an intriguing subject of study. One can define a boundary effect function, which quantifies the change in the ground state as a function of the distance from the boundary. This function serves as an upper bound for the correlation functions and the entanglement entropies in the thermodynamic limit. Here, we perform numerical analyses of the boundary effect function for one-dimensional free-fermion models. We find that the upper bound established by the boundary effect function is tight for the examined systems, providing a deep insight into how correlations and entanglement are developed in the ground state as the system size grows. As a by-product, we derive a general fidelity formula for fermionic Gaussian states in a self-contained manner, rendering the formula easier to apprehend.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 5","pages":"389 - 396"},"PeriodicalIF":0.8,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141528287","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
Feasibility study of normal tissue-sparing effect in proton minibeam radiation therapy: animal experiment 质子微束放射治疗中保留正常组织效应的可行性研究：动物实验
IF 0.8 4区 物理与天体物理
Journal of the Korean Physical Society Pub Date : 2024-06-24 DOI: 10.1007/s40042-024-01086-8
Dohyeon Kim, Kyeongyun Park, Seojin Lee, Ju Sung Kim, Sung Hun Kim, Chankyu Kim, Hak Soo Kim, Jong Hwi Jeong, Dongho Shin, Se Byeong Lee, Yang-Gun Suh, Young Kyung Lim, Ui-Jung Hwang, Sang Hyoun Choi
{"title":"Feasibility study of normal tissue-sparing effect in proton minibeam radiation therapy: animal experiment","authors":"Dohyeon Kim,&nbsp;Kyeongyun Park,&nbsp;Seojin Lee,&nbsp;Ju Sung Kim,&nbsp;Sung Hun Kim,&nbsp;Chankyu Kim,&nbsp;Hak Soo Kim,&nbsp;Jong Hwi Jeong,&nbsp;Dongho Shin,&nbsp;Se Byeong Lee,&nbsp;Yang-Gun Suh,&nbsp;Young Kyung Lim,&nbsp;Ui-Jung Hwang,&nbsp;Sang Hyoun Choi","doi":"10.1007/s40042-024-01086-8","DOIUrl":"10.1007/s40042-024-01086-8","url":null,"abstract":"<div><p>In the recent study of proton therapy, the expectation of the normal tissue-sparing effect of the proton minibeam radiation therapy (pMBRT) using a multi-slit collimator (MSC) is increasing. We designed and conducted animal experiments to verify the sparing effect on normal tissues. Proton beam irradiation was carried out on two groups of mice except a control group (0 Gy). One group was irradiated with a conventional broad beam, and the other with a minibeam. A dose of 8.5 Gy was delivered to both femurs of mice in every group. In the pMBRT group, the survival rate of bone marrow cells was significantly improved as compared to the conventional broad beam group. The survival rate in the minibeam group was 2.5 times higher. In conclusion, the pMBRT has been strongly proven to have a superior tissue-sparing effect than the conventional broad beam.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 3","pages":"267 - 270"},"PeriodicalIF":0.8,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141528289","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
Dynamical properties of nonlinear dust ion-acoustic waves on the basis of the Schamel–KdV equation 基于沙梅尔-KdV 方程的非线性尘埃离子声波的动力学特性
IF 0.8 4区 物理与天体物理
Journal of the Korean Physical Society Pub Date : 2024-06-24 DOI: 10.1007/s40042-024-01121-8
Jintu Ozah, P. N. Deka
{"title":"Dynamical properties of nonlinear dust ion-acoustic waves on the basis of the Schamel–KdV equation","authors":"Jintu Ozah,&nbsp;P. N. Deka","doi":"10.1007/s40042-024-01121-8","DOIUrl":"10.1007/s40042-024-01121-8","url":null,"abstract":"<div><p>In this present study, our objective is to investigate the formation of dust ion-acoustic solitary and periodic waves in a superthermal magnetised plasma featuring both positive and negative charged ions, energetic trapped electrons, and oppositely charged dust particles. We have used the reductive perturbation technique (RPT) to get the Schamel–Korteweg-de Vries (Schamel–KdV) equation, which describes the behaviour of dust ion-acoustic solitary waves (DIASWs). Based on the theory of planar dynamical systems, the possible existing solution of the Schamel–KdV equation is shown in the phase portrait diagram. Sagdeev’s pseudopotential equation is also derived and the features of DIASWs are analysed in combination with the soliton solution. Through the graphical presentation, we have analysed the role of the physical parameters on the characteristics of solitonic and periodic waves, along with the electric field. This investigation has the potential to elucidate the formation of nonlinear waves in diverse astrophysical settings (e.g., ionosphere, solar wind, mesosphere, auroral zone, magnetosphere, etc.) and also laboratory devices that contain opposite-polarity dust-charged particles, superthermally trapped electrons, and both positive and negative ion species.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 4","pages":"292 - 304"},"PeriodicalIF":0.8,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503167","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
Bridging terahertz metal slot antenna with parameterized electrical conductivity: insights from finite element method and microscopic theory 具有参数化导电性的桥接太赫兹金属槽天线：有限元法和微观理论的启示
IF 0.8 4区 物理与天体物理
Journal of the Korean Physical Society Pub Date : 2024-06-24 DOI: 10.1007/s40042-024-01124-5
Taehoon Kim, Ki Hoon Lee, Geonwoo Lee, Jaechan Im, Dong Ju Lim, Seonghun Kim, Sung Ju Hong, Byoung Hee Moon, Young-Mi Bahk
{"title":"Bridging terahertz metal slot antenna with parameterized electrical conductivity: insights from finite element method and microscopic theory","authors":"Taehoon Kim,&nbsp;Ki Hoon Lee,&nbsp;Geonwoo Lee,&nbsp;Jaechan Im,&nbsp;Dong Ju Lim,&nbsp;Seonghun Kim,&nbsp;Sung Ju Hong,&nbsp;Byoung Hee Moon,&nbsp;Young-Mi Bahk","doi":"10.1007/s40042-024-01124-5","DOIUrl":"10.1007/s40042-024-01124-5","url":null,"abstract":"<div><p>Metal slot antennas exhibit high transmission characteristics at resonant frequencies when electromagnetic waves with polarization in the width direction of the rectangular hole structure enter, having wavelengths approximately twice the length of the rectangular hole. In this study, we utilize COMSOL multiphysics simulation to examine the transmission behaviors of such resonators operating in terahertz frequency range, with a specific emphasis on their performance when incorporating micron-sized conductive embedding within the central region of the rectangular slot. We observe that as the conductivity of the embedding material increases, the resonant frequency undergoes a shift towards higher values through non-resonant behaviors in the intermediate conductivity range, eventually reaching nearly twice the fundamental resonant mode. The additional analytic microscopic calculation reveals that the interference effect of the electromagnetic field inside the slot antenna can be responsible for the transmittance modifications and provides a reference for investigating unknown embedded targets. These findings provide valuable insights into the versatile applications of metal slot antennas, particularly in areas such as sensing and detection of subwavelength materials.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 5","pages":"415 - 420"},"PeriodicalIF":0.8,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141528288","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
Integrating the strengths of cVAE and cGAN into cAAE for advanced inverse design of colloidal quantum dots 将 cVAE 和 cGAN 的优势整合到 cAAE 中，实现胶体量子点的高级逆向设计
IF 0.8 4区 物理与天体物理
Journal of the Korean Physical Society Pub Date : 2024-06-24 DOI: 10.1007/s40042-024-01127-2
Deokho Jang, Jungho Kim
{"title":"Integrating the strengths of cVAE and cGAN into cAAE for advanced inverse design of colloidal quantum dots","authors":"Deokho Jang,&nbsp;Jungho Kim","doi":"10.1007/s40042-024-01127-2","DOIUrl":"10.1007/s40042-024-01127-2","url":null,"abstract":"<div><p>Colloidal quantum dots (QDs) exhibit unique structures, which often result in distinctive optical properties such as emission and absorption spectra. However, QDs with different structures can sometimes show very similar emission and absorption spectra, making it difficult to inversely design their precise structural parameters from a given target emission and absorption spectra. To overcome this so-called one-to-many mapping problem, this paper introduces a novel deep-learning-based generative model for the inverse design of QDs. In particular, we implement three types of conditional generative models: the conditional generative adversarial network (cGAN), the conditional variational autoencoder (cVAE), and the conditional adversarial autoencoder (cAAE). Each model is designed and trained to predict possible layer thicknesses of QDs that can provide a given target emission and absorption spectra, thus providing possible multiple solutions rather than a single deterministic outcome. This multi-solution approach not only increases the flexibility in QD structure design, but also enhances the accuracy and efficiency of the predictive process. According to calculation results, the cAAE stands out by effectively combining the strengths of both cGAN and cVAE. This integration allows cAAE to produce a more diverse and accurate inversely designed structures of InP/ZnSe/ZnS QDs.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 5","pages":"437 - 447"},"PeriodicalIF":0.8,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141528286","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
Physical phenomena for zero temperature limit 零温极限的物理现象
IF 0.8 4区 物理与天体物理
Journal of the Korean Physical Society Pub Date : 2024-06-19 DOI: 10.1007/s40042-024-01115-6
Heetae Kim, Soon Jae Yu
{"title":"Physical phenomena for zero temperature limit","authors":"Heetae Kim,&nbsp;Soon Jae Yu","doi":"10.1007/s40042-024-01115-6","DOIUrl":"10.1007/s40042-024-01115-6","url":null,"abstract":"<div><p>Physical phenomena at the zero temperature limit are studied in the field of accelerator physics. Experimental techniques have been developed to achieve temperatures approaching 0 K. As the universe expands, its background temperature continuously decreases. The energy density of thermal radiation is depicted as a function of temperature across different dimensions. In superconducting cavities, the surface resistance reduces to residual resistance at 0 K. The resistivity of various material types is presented in terms of temperature, and the thermal expansion of solid materials is also illustrated in terms of dimension. Blackbody radiation ceases at 0 K, along with thermal diffusion and thermal noise. However, quantum diffusion and zero-point noise persist at 0 K. With the exception of helium, all gases solidify at this temperature. Despite being at 0 K, zero-point energy still exists, and fundamental forces remain active. Moreover, black holes are expected to evaporate at 0 K, and the evaporation rate of black holes is calculated under these conditions.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 2","pages":"129 - 137"},"PeriodicalIF":0.8,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503168","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
Erratum: Preliminary study on the design of a predictive structural model for daily quality assurance in proton beams 勘误：关于设计质子束日常质量保证预测结构模型的初步研究
IF 0.8 4区 物理与天体物理
Journal of the Korean Physical Society Pub Date : 2024-06-19 DOI: 10.1007/s40042-024-01125-4
Ui-Jung Hwang, Jeong-Eun Rah
{"title":"Erratum: Preliminary study on the design of a predictive structural model for daily quality assurance in proton beams","authors":"Ui-Jung Hwang,&nbsp;Jeong-Eun Rah","doi":"10.1007/s40042-024-01125-4","DOIUrl":"10.1007/s40042-024-01125-4","url":null,"abstract":"","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 2","pages":"212 - 212"},"PeriodicalIF":0.8,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142412400","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
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