Current Applied Physics最新文献_第6页

Electrical characteristic depending on the doping concentration of the AlGaSb barrier in the GaSb based dual-band nBn detector 基于GaSb的双波段nBn探测器中AlGaSb势垒掺杂浓度的电特性

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-24 DOI: 10.1016/j.cap.2025.06.011

Jong Hun Lee , Geun Hyeong Kim , Tae In Kang , Min Soo Kwak , Jong Su Kim , Sang Jun Lee , Dong Wan Kim

{"title":"Electrical characteristic depending on the doping concentration of the AlGaSb barrier in the GaSb based dual-band nBn detector","authors":"Jong Hun Lee , Geun Hyeong Kim , Tae In Kang , Min Soo Kwak , Jong Su Kim , Sang Jun Lee , Dong Wan Kim","doi":"10.1016/j.cap.2025.06.011","DOIUrl":"10.1016/j.cap.2025.06.011","url":null,"abstract":"<div><div>This paper investigates the effect of n-type doping in the Al0.35Ga0.65Sb barrier with undoped, Te:2x1015 cm−3, and Te:2x1016 cm−3 doping in the near-infrared (NIR)/short-wavelength infrared (SWIR) nBn detector through temperature-dependent dark current density and photocurrent density measurement. The dark current density at 80 K, 0.1 V were 0.003 A/cm2 (undoped), 0.005 A/cm2 (2x1015 cm−3), 0.053 A/cm2 (2x1016 cm−3). Given the negligible diffusion current and generation-recombination (G-R) current at low temperature, the increase is attributed to increased trap-assisted tunneling (TAT). In addition, the turn-on voltage of photocurrent at 300 K were 50 mV (undoped), 55 mV (2x1015 cm−3), and 70 mV (2x1016 cm−3), showing no significant increase with doping. This study indicates the importance of appropriate barrier doping concentration in designing of GaSb-based nBn detector for low-noise performance.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"78 ","pages":"Pages 24-28"},"PeriodicalIF":2.4,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514352","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

Revisiting LaMnO3: A density functional theory study 再论LaMnO3：密度泛函理论研究

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-18 DOI: 10.1016/j.cap.2025.06.010

Ju Hyeon Lee, Bongjae Kim

{"title":"Revisiting LaMnO3: A density functional theory study","authors":"Ju Hyeon Lee, Bongjae Kim","doi":"10.1016/j.cap.2025.06.010","DOIUrl":"10.1016/j.cap.2025.06.010","url":null,"abstract":"<div><div>Density functional theory has been widely applied to a variety of realistic materials but often fails to accurately describe the properties of correlated systems. The DFT + U method, which introduces a Hubbard U correction to the DFT, has been instrumental in the study of systems such as transition metal oxides. However, the methodological details of DFT + U and its specific impact on the electronic structure and magnetic properties of correlated systems remain incompletely understood. In this study, using the prototypical transition metal oxide LaMnO3 as an example, we systematically assess the performance of two distinct DFT + U methods: spin-polarized DFT + U (SDFT + U) and spin-unpolarized charge-only DFT + U (CDFT + U). We found that, while the Coulomb U acts similarly in both approaches, the Hund's JH plays a fundamentally different role, particularly in determining the correct magnetic phases. Our investigation demonstrates the active role of JH in the exchange splitting, leading to distinct magnetic ground states based on the different schemes. We further investigate the associated magnetic exchange interactions and compare our results with beyond-DFT methods.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"78 ","pages":"Pages 7-14"},"PeriodicalIF":2.4,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144366518","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

Selective hydrogen molecule dissociation on Ca2N monolayer 氢分子在Ca2N单层上的选择性解离

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-18 DOI: 10.1016/j.cap.2025.06.009

Gwan Woo Kim , Soonmin Jang , Gunn Kim

{"title":"Selective hydrogen molecule dissociation on Ca2N monolayer","authors":"Gwan Woo Kim , Soonmin Jang , Gunn Kim","doi":"10.1016/j.cap.2025.06.009","DOIUrl":"10.1016/j.cap.2025.06.009","url":null,"abstract":"<div><div>The development of efficient hydrogen conversion and storage technologies is critical for sustainable energy systems. We report the remarkable discovery of barrierless hydrogen dissociation on dicalcium nitride (Ca2N) monolayers through density functional theory calculations and ab initio molecular dynamics simulations. Our investigations reveal that molecular hydrogen adsorption occurs exclusively at a bridge site between calcium atoms (site B), while dissociated hydrogen atoms preferentially migrate to a calcium-centered hollow site (site A). Importantly, our simulations demonstrate a self-regulating mechanism wherein initial H2 dissociation at B-sites inhibits subsequent molecular hydrogen adsorption, effectively controlling the dissociation process. The absence of an activation energy barrier indicates an exceptionally favorable thermodynamic pathway for hydrogen dissociation under ambient conditions. These findings establish pristine Ca2N monolayers as promising candidates for catalyzing hydrogen evolution reactions and other hydrogen-related energy applications, offering a novel direction for the development of electride-based catalysts with unprecedented hydrogen activation properties.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"78 ","pages":"Pages 15-23"},"PeriodicalIF":2.4,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144480361","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

Strain-dependent charge density wave stability in monolayer Kagome AV3Sb5 (A = K, Rb, Cs) Kagome AV3Sb5单层膜应变相关电荷密度波稳定性（A = K, Rb, Cs）

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-17 DOI: 10.1016/j.cap.2025.06.008

Jun-Hee Im , Chang-Jong Kang , Chang-Youn Moon

引用次数: 0

Study on the effect of different crystal forms of benzamide on the luminescence properties of Mn2+ in organic-inorganic hybrid metal halides 苯甲酰胺不同晶型对有机-无机杂化金属卤化物中Mn2+发光性能影响的研究

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-13 DOI: 10.1016/j.cap.2025.06.007

Mengyu Guan, Ranran Bu, Haizhen Song, Changyuan Xu, Yichao Wang, Yan Zhang, Hongming Yin

引用次数: 0

Revealing the anisotropies in elasticity, sound velocities and thermal conductivities of o-HfO2: A density functional theory investigation 揭示o-HfO2弹性、声速和导热系数的各向异性：密度泛函理论研究

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-11 DOI: 10.1016/j.cap.2025.06.003

Cheng-Di Qi , Jian-Li Ma , Ze-Qing Guo , Wei-Wen Wang , Qun Wei

引用次数: 0

The significant improvements of DC magnetron sputtering plasma source via cryogenic cooling method for spintronics applications 低温冷却方法对自旋电子学应用中直流磁控溅射等离子体源的显著改进

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-09 DOI: 10.1016/j.cap.2025.06.004

Joonwoo Kim , Jaehun Cho , Si-Ho Oh , June-Seo Kim

{"title":"The significant improvements of DC magnetron sputtering plasma source via cryogenic cooling method for spintronics applications","authors":"Joonwoo Kim , Jaehun Cho , Si-Ho Oh , June-Seo Kim","doi":"10.1016/j.cap.2025.06.004","DOIUrl":"10.1016/j.cap.2025.06.004","url":null,"abstract":"<div><div>This study investigates the significant enhancement of DC magnetron sputtering plasma sources using a cryogenic cooling system to focus on its impact on thin-film deposition processes. The efficiency of magnetron-sputtering plasma sources directly depends on the in-plane magnetic fields, which are generated by permanent magnets installed inside the plasma source head. However, the permanent magnets are severely deteriorated when the system temperature is increased due to the plasma ignitions. In this case, the cryogenic cooling system effectively overcomes this limitation and it can improve the magnetic flux density and performance stability of the plasma source. Experimental results demonstrate that cryogenic cooling enhances deposition rates and film uniformity for both ferromagnetic (cobalt) and non-magnetic (tungsten) materials. Cobalt (Co) and tungsten (W) targets serve as representative examples, with deposition rates improving by approximately 27 % and 19 %, and uniformities increasing by 18 % and 19 %, respectively, compared to water-cooled systems. Additionally, the cryogenic cooling method allows for the use of thicker ferromagnetic targets that the magnetic target thickness limit is widely extended to 5.0 mm, which can reduce maintenance costs and process interruptions. From the systematic numerical simulations, one can be revealed that a strong magnetic field distortion due to a thin magnetic target is observed and it can occur the degradation of the efficiency of the plasma source. Moreover, the in-plane magnetic fields from permanent magnets are dramatically increased with decreasing the system temperatures. This study can highlight that the cryogenic cooling method of the magnetron sputtering plasma source is a transformative technology to improve the efficiency and reliability of the thin film deposition process for spintronic devices.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"77 ","pages":"Pages 100-107"},"PeriodicalIF":2.4,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262878","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

Dirac nodal line and pseudo-gap in 1T-VS2 single crystal 1T-VS2单晶中的Dirac节线和赝隙

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-09 DOI: 10.1016/j.cap.2025.06.005

Mincheol Kim , Hyuk Jin Kim , Byoung Ki Choi , Tae Gyu Rhee , Chris Jozwiak , Aaron Bostwick , Eli Rotenberg , Sunghun Lee , Young Jun Chang

{"title":"Dirac nodal line and pseudo-gap in 1T-VS2 single crystal","authors":"Mincheol Kim , Hyuk Jin Kim , Byoung Ki Choi , Tae Gyu Rhee , Chris Jozwiak , Aaron Bostwick , Eli Rotenberg , Sunghun Lee , Young Jun Chang","doi":"10.1016/j.cap.2025.06.005","DOIUrl":"10.1016/j.cap.2025.06.005","url":null,"abstract":"<div><div>Vanadium disulfide (VS2), one of transition metal dichalcogenide (TMDC) family, attracts elevated interests for its charge-density wave phase transition, ferromagnetism, optoelectronic switching, and catalytic reactivity, but the topological Dirac surface states have not been observed yet. Here we report the Dirac nodal line states of VS2 single crystals via angle-resolved photoemission spectroscopy (ARPES) measurements. ARPES analysis reveals that Dirac nodal line surface states are extended from the Μ point toward the Γ point with energy of −1.1 eV. Comparison with the other vanadium chalcogenides shows monotonic energy shift of the Dirac states depending on the spin-orbit coupling strength of the chalcogen atoms. Furthermore, we studied the temperature-dependence of pseudo gaps near both the M and Γ points. Our observations provide experimental evidence of topological electronic structures, contributing to the understanding of the correlated TMDC systems and their potential in switching devices, optical saturable absorber, and electrocatalysis.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"77 ","pages":"Pages 94-99"},"PeriodicalIF":2.4,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144254393","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

Griffiths phase and magnetocaloric behaviors of Co-doped Nd0.6Sr0.4MnO3 共掺杂Nd0.6Sr0.4MnO3的Griffiths相和磁热行为

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-05 DOI: 10.1016/j.cap.2025.06.001

Tran Dang Thanh , Kim T.H. My , Do Hung Manh , The-Long Phan , D.-H. Kim

{"title":"Griffiths phase and magnetocaloric behaviors of Co-doped Nd0.6Sr0.4MnO3","authors":"Tran Dang Thanh , Kim T.H. My , Do Hung Manh , The-Long Phan , D.-H. Kim","doi":"10.1016/j.cap.2025.06.001","DOIUrl":"10.1016/j.cap.2025.06.001","url":null,"abstract":"<div><div>Nd0.6Sr0.4Mn1-yCoyO3 (y = 0–0.09) compounds have been fabricated by using solid-state reactions. X-ray diffraction analyses reveal their monophase in the Imma orthorhombic structure. When y increases, there are gradual reductions of the unit-cell parameters and porosity. Concurrently, the Curie temperature (TC) also reduces from 280 K (y = 0) to ∼232 K (y = 0.09). In the vicinity of TC, we have observed the Griffiths phase that more develops as increasing y. The presence of this phase enhances magnetocaloric responses, corresponding to the operating range widened above 95 % and the cooling power enhanced ∼30 % for an applied field H = 30 kOe. All materials exhibit the characters of a second-order phase transition with a narrow hysteresis loop, suggesting their applicability in magnetic cooling devices operating below room temperature. A coexistence of Mn3+,4+ and Co3+,4+ ions is thought to establish randomly competing ferromagnetic and antiferromagnetic interactions in Nd0.6Sr0.4Mn1-yCoyO3 compounds that widen the Griffiths phase, short-range magnetic ordering, and magnetocaloric response.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"77 ","pages":"Pages 85-93"},"PeriodicalIF":2.4,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144242482","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

Improved ultraviolet resistant through the natural antioxidants in efficient perovskite photovoltaics 通过在高效钙钛矿光伏电池中添加天然抗氧化剂来提高其抗紫外线性能

IF 2.4 4区物理与天体物理

Current Applied Physics Pub Date : 2025-06-04 DOI: 10.1016/j.cap.2025.05.014

Xueyuan Li , Yaru Du , Niqian Du , Shanshan Du , Tianxiao Liu , Kaikai Liu , Zhiyong Liu

引用次数: 0