Chinese Physics Letters最新文献_第4页

Low-Voltage IGZO Field-Effect Ultraviolet Photodiode 低电压 IGZO 场效应紫外线光电二极管

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2024-06-01 DOI: 10.1088/0256-307x/41/6/068501

Shuang Song, Huili Liang, Wenxing Huo, Guang Zhang, Yonghui Zhang, Jiwei Wang, Zengxia Mei

{"title":"Low-Voltage IGZO Field-Effect Ultraviolet Photodiode","authors":"Shuang Song, Huili Liang, Wenxing Huo, Guang Zhang, Yonghui Zhang, Jiwei Wang, Zengxia Mei","doi":"10.1088/0256-307x/41/6/068501","DOIUrl":"https://doi.org/10.1088/0256-307x/41/6/068501","url":null,"abstract":"In the era of Internet of Things (IoTs), an energy-efficient ultraviolet (UV) photodetector (PD) is highly desirable considering the massive usage scenarios such as environmental sterilization, fire alarm and corona discharge monitoring. So far, common self-powered UV PDs are mainly based on metal-semiconductor hetero-structures or p–n heterojunctions, where the limited intrinsic built-in electric field restricts further enhancement of the photoresponsivity. In this work, an extremely low-voltage field-effect UV PD is proposed using a gate-drain shorted amorphous IGZO (a-IGZO) thin film transistor (TFT) architecture. A combined investigation of the experimental measurements and technology computer-aided design (TCAD) simulations suggests that the reverse current (<italic toggle=\"yes\">I</italic>R) of field-effect diode (FED) is highly related with the threshold voltage (<italic toggle=\"yes\">V</italic>th) of the parental TFT, implying an enhancement-mode TFT is preferable to fabricate the field-effect UV PD with low dark current. Driven by a low bias of −0.1 V, decent UV response has been realized including large UV/visible (<italic toggle=\"yes\">R</italic>300/<italic toggle=\"yes\">R</italic>550) rejection ratio (1.9 × 103), low dark current (1.15 × 10−12 A) as well as high photo-to-dark current ratio (PDCR, ∼ 103) and responsivity (1.89 A/W). This field-effect photodiode provides a new platform to construct UV PDs with well-balanced photoresponse performance at a low bias, which is attractive for designs of large-scale smart sensor networks with high energy efficiency.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"40 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141574781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Imaging plate scanners calibration and the attenuation behavior of imaging plate signals 成像板扫描仪的校准和成像板信号的衰减行为

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2024-06-01 DOI: 10.1088/1674-1056/ad43d4

Nan Bo, Nai-Yan Wang

引用次数: 0

Dissipation-Driven Superradiant Phase Transition of a Two-Dimensional Bose–Einstein Condensate in a Double Cavity 双腔中二维玻色-爱因斯坦凝结物的耗散驱动超辐射相变

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2024-06-01 DOI: 10.1088/0256-307x/41/6/064201

Bo-Hao Wu, Xin-Xin Yang, Yu Chen, Wei Zhang

引用次数: 0

Universal Machine Learning Kohn–Sham Hamiltonian for Materials 材料的通用机器学习 Kohn-Sham 哈密顿方程

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2024-05-31 DOI: 10.1088/0256-307x/41/7/077103

Yang Zhong, 阳钟, Hongyu Yu, 宏宇于, Jihui Yang, 吉辉杨, Xingyu Guo, 星宇郭, Hongjun Xiang, 红军向, Xingao Gong and 新高龚

{"title":"Universal Machine Learning Kohn–Sham Hamiltonian for Materials","authors":"Yang Zhong, 阳钟, Hongyu Yu, 宏宇于, Jihui Yang, 吉辉杨, Xingyu Guo, 星宇郭, Hongjun Xiang, 红军向, Xingao Gong and 新高龚","doi":"10.1088/0256-307x/41/7/077103","DOIUrl":"https://doi.org/10.1088/0256-307x/41/7/077103","url":null,"abstract":"While density functional theory (DFT) serves as a prevalent computational approach in electronic structure calculations, its computational demands and scalability limitations persist. Recently, leveraging neural networks to parameterize the Kohn–Sham DFT Hamiltonian has emerged as a promising avenue for accelerating electronic structure computations. Despite advancements, challenges such as the necessity for computing extensive DFT training data to explore each new system and the complexity of establishing accurate machine learning models for multi-elemental materials still exist. Addressing these hurdles, this study introduces a universal electronic Hamiltonian model trained on Hamiltonian matrices obtained from first-principles DFT calculations of nearly all crystal structures on the Materials Project. We demonstrate its generality in predicting electronic structures across the whole periodic table, including complex multi-elemental systems, solid-state electrolytes, Moiré twisted bilayer heterostructure, and metal-organic frameworks. Moreover, we utilize the universal model to conduct high-throughput calculations of electronic structures for crystals in GNoME datasets, identifying 3940 crystals with direct band gaps and 5109 crystals with flat bands. By offering a reliable efficient framework for computing electronic properties, this universal Hamiltonian model lays the groundwork for advancements in diverse fields, such as easily providing a huge data set of electronic structures and also making the materials design across the whole periodic table possible.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"8 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Cosmology-Independent Photon Mass Limits from Localized Fast Radio Bursts by Using Artificial Neural Networks 利用人工神经网络从局部快速射电暴得出与宇宙学无关的光子质量极限

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2024-05-01 DOI: 10.1088/0256-307x/41/5/059501

Jing-Yu Ran, Bao Wang, Jun-Jie Wei

{"title":"Cosmology-Independent Photon Mass Limits from Localized Fast Radio Bursts by Using Artificial Neural Networks","authors":"Jing-Yu Ran, Bao Wang, Jun-Jie Wei","doi":"10.1088/0256-307x/41/5/059501","DOIUrl":"https://doi.org/10.1088/0256-307x/41/5/059501","url":null,"abstract":"A hypothetical photon mass <italic toggle=\"yes\">mγ\u0000</italic> can produce a frequency-dependent vacuum dispersion of light, which leads to an additional time delay between photons with different frequencies when they propagate through a fixed distance. The dispersion measure and redshift measurements of fast radio bursts (FRBs) have been widely used to constrain the rest mass of the photon. However, all current studies analyzed the effect of the frequency-dependent dispersion for massive photons in the standard ΛCDM cosmological context. In order to alleviate the circularity problem induced by the presumption of a specific cosmological model based on the fundamental postulate of the masslessness of photons, here we employ a new model-independent smoothing technique, artificial neural network (ANN), to reconstruct the Hubble parameter <italic toggle=\"yes\">H</italic>(<italic toggle=\"yes\">z</italic>) function from 34 cosmic-chronometer measurements. By combining observations of 32 well-localized FRBs and the <italic toggle=\"yes\">H</italic>(<italic toggle=\"yes\">z</italic>) function reconstructed by ANN, we obtain an upper limit of <italic toggle=\"yes\">mγ\u0000</italic> ≤ 3.5 × 10−51 kg, or equivalently <italic toggle=\"yes\">mγ\u0000</italic> ≤ 2.0 × 10−15 eV/c2 (<italic toggle=\"yes\">mγ\u0000</italic> ≤ 6.5 × 10−51 kg, or equivalently <italic toggle=\"yes\">mγ\u0000</italic> ≤ 3.6 × 10−15 eV/c2) at the 1<italic toggle=\"yes\">σ</italic> (2<italic toggle=\"yes\">σ</italic>) confidence level. This is the first cosmology-independent photon mass limit derived from extragalactic sources.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"50 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141190321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Current-Induced Magnetization Switching Behavior in Perpendicular Magnetized L10-MnAl/B2-CoGa Bilayer 垂直磁化 L10-MnAl/B2-CoGa 双层中电流诱导的磁化切换行为

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2024-05-01 DOI: 10.1088/0256-307x/41/5/057503

Hong-Li Sun, Rong-Kun Han, Hong-Rui Qin, Xu-Peng Zhao, Zhi-Cheng Xie, Da-Hai Wei, Jian-Hua Zhao

{"title":"Current-Induced Magnetization Switching Behavior in Perpendicular Magnetized L10-MnAl/B2-CoGa Bilayer","authors":"Hong-Li Sun, Rong-Kun Han, Hong-Rui Qin, Xu-Peng Zhao, Zhi-Cheng Xie, Da-Hai Wei, Jian-Hua Zhao","doi":"10.1088/0256-307x/41/5/057503","DOIUrl":"https://doi.org/10.1088/0256-307x/41/5/057503","url":null,"abstract":"Rare-earth-free Mn-based binary alloy L10-MnAl with bulk perpendicular magnetic anisotropy (PMA) holds promise for high-performance magnetic random access memory (MRAM) devices driven by spin-orbit torque (SOT). However, the lattice-mismatch issue makes it challenging to place conventional spin current sources, such as heavy metals, between L10-MnAl layers and substrates. In this work, we propose a solution by using the B2-CoGa alloy as the spin current source. The lattice-matching enables high-quality epitaxial growth of 2-nm-thick L10-MnAl on B2-CoGa, and the L10-MnAl exhibits a large PMA constant of 1.04 × 106 J/m3. Subsequently, the considerable spin Hall effect in B2-CoGa enables the achievement of SOT-induced deterministic magnetization switching. Moreover, we quantitatively determine the SOT efficiency in the bilayer. Furthermore, we design an L10-MnAl/B2-CoGa/Co2MnGa structure to achieve field-free magnetic switching. Our results provide valuable insights for achieving high-performance SOT-MRAM devices based on L10-MnAl alloy.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"14 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141516029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Magnetism and Superconductivity in the t–J Model of La3Ni2O7 Under Multiband Gutzwiller Approximation 多带古茨维勒近似下 La3Ni2O7 t-J 模型的磁性和超导性

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2024-04-30 DOI: 10.1088/0256-307x/41/5/057403

Jie-Ran Xue, 洁然薛, Fa Wang and 垡王

{"title":"Magnetism and Superconductivity in the t–J Model of La3Ni2O7 Under Multiband Gutzwiller Approximation","authors":"Jie-Ran Xue, 洁然薛, Fa Wang and 垡王","doi":"10.1088/0256-307x/41/5/057403","DOIUrl":"https://doi.org/10.1088/0256-307x/41/5/057403","url":null,"abstract":"The recent discovery of possible high temperature superconductivity in single crystals of La3Ni2O7 under pressure renews the interest in research on nickelates. The density functional theory calculations reveal that both dz2 and dx2–y2 orbitals are active, which suggests a minimal two-orbital model to capture the low-energy physics of this system. In this work, we study a bilayer two-orbital t–J model within multiband Gutzwiller approximation, and discuss the magnetism as well as the superconductivity over a wide range of the hole doping. Owing to the inter-orbital super-exchange process between dz2 and dx2–y2 orbitals, the induced ferromagnetic coupling within layers competes with the conventional antiferromagnetic coupling, and leads to complicated hole doping dependence for the magnetic properties in the system. With increasing hole doping, the system transfers to A-type antiferromagnetic state from the starting G-type antiferromagnetic (G-AFM) state. We also find the inter-layer superconducting pairing of dx2–y2 orbitals dominates due to the large hopping parameter of dz2 along the vertical inter-layer bonds and significant Hund’s coupling between dz2 and dx2–y2 orbitals. Meanwhile, the G-AFM state and superconductivity state can coexist in the low hole doping regime. To take account of the pressure, we also analyze the impacts of inter-layer hopping amplitude on the system properties.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"22 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141062475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Quantum Anomalous Hall Effect with Tunable Chern Numbers in High-Temperature 1T-PrN2 Monolayer 高温 1T-PrN2 单层中具有可调谐切尔数的量子反常霍尔效应

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2024-04-30 DOI: 10.1088/0256-307x/41/5/057303

Xu-Cai Wu, 绪才吴, Shu-Zong Li, 树宗李, Jun-Shan Si, 君山司, Bo Huang, 博黄, Wei-Bing Zhang and 卫兵张

{"title":"Quantum Anomalous Hall Effect with Tunable Chern Numbers in High-Temperature 1T-PrN2 Monolayer","authors":"Xu-Cai Wu, 绪才吴, Shu-Zong Li, 树宗李, Jun-Shan Si, 君山司, Bo Huang, 博黄, Wei-Bing Zhang and 卫兵张","doi":"10.1088/0256-307x/41/5/057303","DOIUrl":"https://doi.org/10.1088/0256-307x/41/5/057303","url":null,"abstract":"Quantum anomalous Hall (QAH) insulators have highly potential applications in spintronic device. However, available candidates with tunable Chern numbers and high working temperature are quite rare. Here, we predict a 1T-PrN2 monolayer as a stable QAH insulator with high magnetic transition temperature of above 600 K and tunable high Chern numbers of C = ±3 from first-principles calculations. Without spin-orbit coupling (SOC), the 1T-PrN2 monolayer is predicted to be a p-state Dirac half metal with high Fermi velocity. Rich topological phases depending on magnetization directions can be found when the SOC is considered. The QAH effect with periodical changes of Chern number (±1) can be produced when the magnetic moment breaks all twofold rotational symmetries in the xy plane. The critical state can be identified as Weyl half semimetals. When the magnetization direction is parallel to the z-axis, the system exhibits high Chern number QAH effect with C = ±3. Our work provides a new material for exploring novel QAH effect and developing high-performance topological devices.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"12 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141152342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Maxwell Demon and Einstein–Podolsky–Rosen Steering 麦克斯韦魔与爱因斯坦-波多尔斯基-罗森转向

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2024-04-30 DOI: 10.1088/0256-307x/41/5/050302

Meng-Jun Hu, 孟军胡, Xiao-Min Hu, 晓敏胡, Yong-Sheng Zhang and 永生张

{"title":"Maxwell Demon and Einstein–Podolsky–Rosen Steering","authors":"Meng-Jun Hu, 孟军胡, Xiao-Min Hu, 晓敏胡, Yong-Sheng Zhang and 永生张","doi":"10.1088/0256-307x/41/5/050302","DOIUrl":"https://doi.org/10.1088/0256-307x/41/5/050302","url":null,"abstract":"Research of Maxwell demon and quantum entanglement is important because of its foundational significance in physics and its potential applications in quantum information. Previous studies on the Maxwell demon have primarily focused on thermodynamics, taking into account quantum correlations. Here we consider from another perspective and ask whether quantum non-locality correlations can be simulated by performing work. The Maxwell demon-assisted Einstein–Podolsky–Rosen (EPR) steering is thus proposed, which implies a new type of loophole. The application of Landauer’s erasure principle suggests that the only way to close this loophole during a steering task is by continuously monitoring the heat fluctuation of the local environment by the participant. We construct a quantum circuit model of Maxwell demon-assisted EPR steering, which can be demonstrated by current programmable quantum processors, such as superconducting quantum computers. Based on this quantum circuit model, we obtain a quantitative formula describing the relationship between energy dissipation due to the work of the demon and quantum non-locality correlation. The result is of great physical interest because it provides a new way to explore and understand the relationship between quantum non-locality, information, and thermodynamics.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"34 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141152345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Interlayer Magnetic Interaction in the CrI3/CrSe2 Heterostructure CrI3/CrSe2 异质结构中的层间磁相互作用

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2024-04-30 DOI: 10.1088/0256-307x/41/5/057401

Qiu-Hao Wang, 秋皓王, Mei-Yan Ni, 美燕倪, Shu-Jing Li, 淑静李, Fa-Wei Zheng, 法伟郑, Hong-Yan Lu, 洪艳路, Ping Zhang and 平张

引用次数: 0