Journal of the Korean Physical Society最新文献_第4页

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><p>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.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 8","pages":"691 - 697"},"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><p>The electromagnetic transition form factors for the <span>(N+gamma ^{*}rightarrow N^{*})</span> 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 <span>(N^{*}(1440,1535,1710)rightarrow N)</span> 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.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 7","pages":"541 - 551"},"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

{"title":"Electroluminescence and photocurrent generation in pn-diode of trilayer phosphorene","authors":"Sangho Yoon, Taeho Kim, Su-Beom Song, Kenji Watanabe, Takashi Taniguchi, Jonghwan Kim","doi":"10.1007/s40042-024-01142-3","DOIUrl":"10.1007/s40042-024-01142-3","url":null,"abstract":"<div><p>Van der Waals (vdW) two-dimensional semiconductors exhibit excellent optical properties due to their atomically thin thickness and unique band structures. When they are utilized in optoelectronic device applications, the devices show excellent performance as shown for transition metal dichalcogenides and graphene. However, at telecom frequencies, these demonstrations have been largely missing yet. In this study, we demonstrate that trilayer phosphorene pn-diodes can efficiently emit electroluminescence and generate photocurrent at telecom frequencies. Split gates realize electrically tunable pn-diode devices. Under reverse bias, the device shows prominent photocurrent in the photovoltaic mode. Under forward bias, the device shows prominent electroluminescence at the band edge of 0.82 eV. Interestingly, electroluminescence exhibits strong optical anisotropy due to the crystal anisotropy. Our study shows promising potential of trilayer phosphorene for efficient light emitting and photodetection device applications at telecom frequencies.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 6","pages":"520 - 524"},"PeriodicalIF":0.8,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142184495","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

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><p>This article investigates the performance of a 14 nm gate length heterostructure Si<sub>0.5</sub>Ge<sub>0.5</sub>/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 <i>x</i> = 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 (<i>g</i><sub>m</sub>), gate-to-gate capacitance (<i>C</i><sub>GG</sub>), cutoff frequency (<i>f</i><sub>T</sub>), gain bandwidth product (GBP), transit time (<i>τ</i>), and transconductance frequency product (TFP) are investigated. The fit configuration SiGe-JLGAA device demonstrates <i>g</i><sub>m</sub> = 67.4 µS, <i>f</i><sub>T</sub> = 1033 GHz, GBP = 115 GHz, TFP = 4.2 THz/V and <i>τ</i> = 1.3 × 10<sup>13</sup> s, whereas the corresponding values for a conventional device are 13.5 µS, 354 GHz, 37 GHz, 1.2 THz/V and 5.9 × 10<sup>13</sup> 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.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 8","pages":"650 - 660"},"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><p>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 m<sup>2</sup> 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.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 8","pages":"670 - 676"},"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><p>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 (O<sub>3</sub>) and fluorescence methods for sulfur dioxide (SO<sub>2</sub>). 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 NO<sub>2</sub> and SO<sub>2</sub>. The results showed a sensitivity increase of 6.83 times for NO<sub>2</sub> and 21.39 times for SO<sub>2</sub> compared to conventional CIS. This suggests the potential of UV imaging to overcome these limitations using existing CIS components.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 6","pages":"482 - 489"},"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

Erratum: A deep learning method for predicting proton beam range and spread-out Bragg peak in passive scattering mode 勘误：预测质子束射程和被动散射模式下布拉格峰扩散的深度学习方法

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-08-02 DOI: 10.1007/s40042-024-01149-w

Young Kyu Lee, Sang Hee Ahn, Chankyu Kim, Wonjoong Cheon, Haksoo Kim, Se Byeong Lee, Young Kyung Lim, Jong Hwi Jeong, Young-Nam Kang, Dongho Shin

引用次数: 0

Enhancing quantum state tomography: utilizing advanced statistical techniques for optimized quantum state reconstructions 增强量子态断层成像：利用先进统计技术优化量子态重构

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-08-01 DOI: 10.1007/s40042-024-01155-y

Jenefa Archpaul, Edward Naveen VijayaKumar, Manoranjitham Rajendran, Thompson Stephan, Punitha Stephan, Rishu Chhabra, Saurabh Agarwal, Wooguil Pak

{"title":"Enhancing quantum state tomography: utilizing advanced statistical techniques for optimized quantum state reconstructions","authors":"Jenefa Archpaul, Edward Naveen VijayaKumar, Manoranjitham Rajendran, Thompson Stephan, Punitha Stephan, Rishu Chhabra, Saurabh Agarwal, Wooguil Pak","doi":"10.1007/s40042-024-01155-y","DOIUrl":"10.1007/s40042-024-01155-y","url":null,"abstract":"<div><p>Quantum state tomography (QST) forms the foundational framework in quantum computing, enabling precise characterization of quantum states through specialized measurement arrays. This is crucial for assessing the fidelity and coherence of quantum states in various quantum systems. The complexity and high dimensionality of quantum states require advanced statistical methods to meet modern quantum paradigms’ precision and computational needs, as traditional methods often struggle with inefficiencies and inaccuracies. Conventional approaches in QST typically use linear inversion and maximum likelihood estimators, which often face computational redundancies and perform sub-optimally in high-dimensional quantum architectures. This exposition introduces pioneering statistical methodologies that combine Bayesian Inference, Variational Quantum Eigensolver, and Quantum Neural Networks to achieve enhanced fidelity approximation. The analytical discussion is supported by synthetic quantum states, demonstrating the efficacy and applicability of these statistical methods across various quantum matrices. Preliminary empirical results show a significant increase in fidelity and a notable reduction in error margins, highlighting the potential of these advanced statistical methodologies in optimizing quantum state reconstructions. Additionally, leveraging the inherent symmetry properties in quantum systems could further improve the efficiency and accuracy of state reconstructions, offering additional pathways for advancing the field.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 8","pages":"677 - 690"},"PeriodicalIF":0.8,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141872368","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