Journal of the Korean Physical Society最新文献_第3页

Investigation of large-amplitude ion acoustic solitary waves in a warm magnetoplasma with positive ions and relativistic electrons 研究带有正离子和相对论电子的暖磁等离子体中的大振幅离子声孤波

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-08-22 DOI: 10.1007/s40042-024-01153-0

B. Madhukalya, M. Das, R. Das, L. Kalita

{"title":"Investigation of large-amplitude ion acoustic solitary waves in a warm magnetoplasma with positive ions and relativistic electrons","authors":"B. Madhukalya, M. Das, R. Das, L. Kalita","doi":"10.1007/s40042-024-01153-0","DOIUrl":"10.1007/s40042-024-01153-0","url":null,"abstract":"<div>The Sagdeev pseudopotential (SP) method is used to study ion acoustic solitary waves (IASWs) in a warm, magnetized plasma with relativistic electrons. Employing the pseudopotential approach allows for the investigation of solitary wave (SW) structures across arbitrary amplitudes. The study highlights the simultaneous occurrence of compressive (left( {N > 1} right)) subsonic (left( {M < 1} right)) solitons, as well as rarefactive (left( {N < 1} right)) subsonic and supersonic (left( {M > 1} right)) solitons, under specific parametric conditions. Notably, it is seen that as the direction cosine of wave propagation (k_{z}) increases, both the amplitude of SWs and the depth of the potential well decrease. The reduction in amplitude indicates a closer alignment between the magnetic field lines and the direction of wave propagation. The coexistence of compressive subsonic, rarefactive subsonic, and supersonic solitons in this plasma model is a rich and complex phenomenon that has both fundamental and practical implications in plasma physics. It reflects the intricate interplay of nonlinear effects, particle dynamics, and wave propagation in plasmas, with potential applications in both laboratory and astrophysical contexts.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142184473","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

Engineering high Chern number insulators 高切尔诺数绝缘体工程

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-08-15 DOI: 10.1007/s40042-024-01162-z

Sungjong Woo, Seungbum Woo, Jung-Wan Ryu, Hee Chul Park

{"title":"Engineering high Chern number insulators","authors":"Sungjong Woo, Seungbum Woo, Jung-Wan Ryu, Hee Chul Park","doi":"10.1007/s40042-024-01162-z","DOIUrl":"10.1007/s40042-024-01162-z","url":null,"abstract":"<div>The concept of Chern insulators is one of the most important building block of topological physics, enabling the quantum Hall effect without external magnetic fields. The construction of Chern insulators has been typically through an guess-and-confirm approach, which can be inefficient and unpredictable. In this paper, we introduce a systematic method to directly construct two-dimensional Chern insulators that can provide any nontrivial Chern number. Our method is built upon the one-dimensional Rice–Mele model, which is well known for its adjustable polarization properties, providing a reliable framework for manipulation. By extending this model into two dimensions, we are able to engineer lattice structures that demonstrate predetermined topological quantities effectively. This research not only contributes the development of Chern insulators but also paves the way for designing a variety of lattice structures with significant topological implications, potentially impacting quantum computing and materials science. With this approach, we are to shed light on the pathways for designing more complex and functional topological phases in synthetic materials.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142184492","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

Single proton tight coupling in the bacterial flagellar motor 细菌鞭毛马达中的单质子紧密耦合

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-08-14 DOI: 10.1007/s40042-024-01160-1

Caden Kesselring, Andrew McGovern, Ilyong Jung

{"title":"Single proton tight coupling in the bacterial flagellar motor","authors":"Caden Kesselring, Andrew McGovern, Ilyong Jung","doi":"10.1007/s40042-024-01160-1","DOIUrl":"10.1007/s40042-024-01160-1","url":null,"abstract":"<div>The bacterial flagellar motor is the largest and most complex biological rotary machine that exerts a torque of up to about 1000 pN to propel the swimming of flagellated bacteria. It is embedded in the cell membrane and consists of a 40 nm rotor and about 11 stators. Each stator unit, a torque generating protein complex, is driven by the proton motive force, a proton electrochemical gradient across the inner membrane. However, despite much progress, we lack sufficient evidence of how the ion flow is coupled to motor rotation. Here, we measured the motor speed as a function of the number of stators and found that the number of stators is linearly proportional to the motor speed. Our measurement shows that each stator passes about 24 ions per revolution, indicating that each proton flow can generate torque to drive the motor rotation about 14 degrees which is consistent with 26-fold periodic due to 26 FliG subunits. This result shows that the fixed number of ions yields a constant motor rotation independent of the number of stators and motor speed, indicating proton tight coupling between torque generation and proton flux.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142184493","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

Electromagnetic (N+gamma ^{*}rightarrow N^{*}) transition form factors of nucleons from the hard-wall AdS/QCD model 从硬壁 AdS/QCD 模型看核子的电磁 $$N+gamma ^{*}rightarrow N^{*}$$ 过渡形式因子

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-08-14 DOI: 10.1007/s40042-024-01152-1

Shahin Mamedov, Shahnaz Taghiyeva

{"title":"Electromagnetic (N+gamma ^{*}rightarrow N^{*}) transition form factors of nucleons from the hard-wall AdS/QCD model","authors":"Shahin Mamedov, Shahnaz Taghiyeva","doi":"10.1007/s40042-024-01152-1","DOIUrl":"10.1007/s40042-024-01152-1","url":null,"abstract":"<div>The electromagnetic transition form factors for the (N+gamma ^{*}rightarrow N^{*}) transition between the ground and excited states of nucleons is studied in the framework of the hard-wall model of AdS/QCD. The 5-dimensional equation of motion was solved for the fermion and vector fields. The profile function of the spinor field and bulk-to-boundary propagator of the vector field are presented. The interaction Lagrangian includes other kinds of terms in addition to the minimal coupling term. Using the AdS/CFT correspondence between the generating functions in the bulk and boundary theories, an expression for the transition form factors is obtained from the bulk action for the interaction between the photon and nucleon fields. We consider the (N^{*}(1440,1535,1710)rightarrow N) transitions and plot the Dirac, Pauli and electric, magnetic form factors dependencies on momentum transfer. Also, plots for the helicity amplitudes have been presented and compared to experimental data. The transition radii obtained within the soft-wall model are close to the experimental data for the radii of the nucleons at ground states.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142223967","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

Electroluminescence and photocurrent generation in pn-diode of trilayer phosphorene 三层磷烯 pn 二极管中的电致发光和光电流生成

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-08-13 DOI: 10.1007/s40042-024-01142-3

Sangho Yoon, Taeho Kim, Su-Beom Song, Kenji Watanabe, Takashi Taniguchi, Jonghwan Kim

引用次数: 0

Displacement analysis in three configurations of Si0.5Ge0.5/Si junctionless gate-all-around FET: a study from device to binary and ternary circuit applications Si0.5Ge0.5/Si 无结全栅极场效应晶体管三种配置的位移分析：从器件到二元和三元电路应用的研究

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-08-13 DOI: 10.1007/s40042-024-01159-8

Neda Ghoreishi, Keivan Navi, Reza Sabbaghi-Nadooshan, Mohammad Esmaeldoust

{"title":"Displacement analysis in three configurations of Si0.5Ge0.5/Si junctionless gate-all-around FET: a study from device to binary and ternary circuit applications","authors":"Neda Ghoreishi, Keivan Navi, Reza Sabbaghi-Nadooshan, Mohammad Esmaeldoust","doi":"10.1007/s40042-024-01159-8","DOIUrl":"10.1007/s40042-024-01159-8","url":null,"abstract":"<div>This article investigates the performance of a 14 nm gate length heterostructure Si0.5Ge0.5/Si junctionless gate-all-around (SiGe-JLGAA) device employing SILVACO ATLAS 3D simulator. The proposed device is analyzed in three configurations: underlap, fit, and overlap, and they are compared to a conventional entire region silicon JLGAA structure. First, the choice of x = 0.5 for Ge molar fraction and the device’s physical behavior for all states are discussed. Second, many analog/radio frequency (RF) figures of merit (FoMs) in terms of transconductance (gm), gate-to-gate capacitance (CGG), cutoff frequency (fT), gain bandwidth product (GBP), transit time (τ), and transconductance frequency product (TFP) are investigated. The fit configuration SiGe-JLGAA device demonstrates gm = 67.4 µS, fT = 1033 GHz, GBP = 115 GHz, TFP = 4.2 THz/V and τ = 1.3 × 1013 s, whereas the corresponding values for a conventional device are 13.5 µS, 354 GHz, 37 GHz, 1.2 THz/V and 5.9 × 1013 s, respectively. In addition, the reliability of the proposed device in terms of linearity for the three forms is compared. Finally, using a Verilog-A model in Cadence tool, the applications of the SiGe-JLGAA device in designing two types of inverters, binary and ternary, are demonstrated. The fit form exhibits superior DC and transient characteristics compared to other structures. The proposed device significantly enhances all configurations compared to the conventional JLGAA structure, thereby opening up a wide range of applications in digital circuits.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142184494","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

Out-coupling characteristics of partial resonator mirror for compact terahertz free-electron laser 用于紧凑型太赫兹自由电子激光器的部分谐振器镜面的外耦合特性

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-08-13 DOI: 10.1007/s40042-024-01161-0

Varun Pathania, Hyeon Sang Bark, Kyu-Ha Jang, Kitae Lee, Young Uk Jeong

{"title":"Out-coupling characteristics of partial resonator mirror for compact terahertz free-electron laser","authors":"Varun Pathania, Hyeon Sang Bark, Kyu-Ha Jang, Kitae Lee, Young Uk Jeong","doi":"10.1007/s40042-024-01161-0","DOIUrl":"10.1007/s40042-024-01161-0","url":null,"abstract":"<div>Terahertz light sources with small size and high output enable a variety of new applications. Free-electron laser (FEL) is the most powerful light source in the terahertz (THz) range with perfect wavelength tunability. However, the size of the FEL facility is too large. We are developing a table-top THz FEL using a small microtron accelerator. Through the development of a high-performance and compact undulator and a new waveguide-mode resonator, we confirmed that an FEL size of 1.5 × 2 m2 is possible. One of the reasons we could design the small FEL is because we do not use electromagnets to force the electron beam into and out of the FEL resonator. We have developed an out-coupling mirror of the FEL resonator for a wide spectral range from 0.5 to 1 THz to have a structure in which the electron and THz beam transmit simultaneously without any bending magnets. The out-coupling mirror has wire-grid-polarizer (WGP) structure in the center. This paper discusses optimizing the WGP's parameters like wire thickness and period to get appropriate reflectance and transmittance in the 0.5–1 THz region and has low electron beam loss in the waveguide-based resonator using the COMSOL Multiphysics simulation. Simulations found the optimized value of wire thickness and period as 20 and 100 µm, respectively. We further calculated the TE transmittance of the WGP, which is 1-030% for the optimized values, depending on the frequency, ranging from 0.5 to 1 THz. Experiments using the THz time-domain spectroscopy method validated that the measured results agreed with those of the simulations.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142184501","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 analysis of gated SWIR imaging system for target against plume background 针对目标和羽流背景的门控 SWIR 成像系统性能分析

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-08-13 DOI: 10.1007/s40042-024-01158-9

Jung Rim Nam, Yong San Shin, Eun Suk Yoon

引用次数: 0

Ultraviolet CMOS image sensor for environment analysis via energy-down-shift mechanism of blue-light emitting quantum dots 通过蓝光发射量子点的能量下移机制实现用于环境分析的紫外线 CMOS 图像传感器

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-08-08 DOI: 10.1007/s40042-024-01132-5

Ui-Hyun Jeong, Jea-Gun Park

{"title":"Ultraviolet CMOS image sensor for environment analysis via energy-down-shift mechanism of blue-light emitting quantum dots","authors":"Ui-Hyun Jeong, Jea-Gun Park","doi":"10.1007/s40042-024-01132-5","DOIUrl":"10.1007/s40042-024-01132-5","url":null,"abstract":"<div>Recently, there has been a global societal focus on the management of air pollution. Measurements of air pollution are conducted using various methods depending on the pollutants, including ultraviolet (UV) absorption methods for ozone (O3) and fluorescence methods for sulfur dioxide (SO2). However, the conventional silicon-based complementary metal–oxide–semiconductor image sensor (Si-CIS) is not suitable for UV measurements due to the low quantum efficiency (QE) of silicon for UV light. Consequently, different types of detection sensors are used for different air pollutants, leading to limitations in measurement locations and resulting in errors depending on the installation position. To address these limitations, we propose a quantum dot complementary metal–oxide–semiconductor image sensor (QD-CIS) capable of imaging UV light using the energy-down-shift (EDS) mechanism of quantum dots (QDs). The synthesized QDs absorb light at UV wavelengths, convert it into visible blue light through EDS, and emit luminescence. The converted intensity allows the detection of UV intensity by the CIS. Through the designed QD-CIS and UV LED illumination, we measured the sensitivity to changes in the concentrations of the representative air pollutants NO2 and SO2. The results showed a sensitivity increase of 6.83 times for NO2 and 21.39 times for SO2 compared to conventional CIS. This suggests the potential of UV imaging to overcome these limitations using existing CIS components.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141928126","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

Holographic dark energy with torsion 带有扭转的全息暗能量

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-08-08 DOI: 10.1007/s40042-024-01154-z

Yongjun Yun, Jungjai Lee

引用次数: 0