Physica E-low-dimensional Systems & Nanostructures最新文献_第10页

Capturing magic angles in twisted bilayer graphene from information theory markers 从信息论标记捕获扭曲双层石墨烯的魔角

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-12 DOI: 10.1016/j.physe.2025.116199

Manuel Calixto , Alberto Mayorgas , Octavio Castaños

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Enhanced tunneling probabilities through a barrier with embedded δ−potential wells 通过嵌入δ -势阱的势垒的隧穿概率增强

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-11 DOI: 10.1016/j.physe.2025.116200

Jamie D. Walls, Karna Nagalla

{"title":"Enhanced tunneling probabilities through a barrier with embedded δ−potential wells","authors":"Jamie D. Walls, Karna Nagalla","doi":"10.1016/j.physe.2025.116200","DOIUrl":"10.1016/j.physe.2025.116200","url":null,"abstract":"<div><div>A theory for the tunneling of electrons through a one dimensional barrier of length <span><math><msub><mrow><mi>L</mi></mrow><mrow><mi>B</mi></mrow></msub></math></span> embedded with <span><math><mrow><mi>δ</mi><mo>−</mo></mrow></math></span>wells is presented. For a periodic arrangement of <span><math><msub><mrow><mi>N</mi></mrow><mrow><mi>S</mi></mrow></msub></math></span> <span><math><mrow><mi>δ</mi><mo>−</mo></mrow></math></span>wells, 100% transmission through a barrier can occur via transmission modes with effective wavelengths <span><math><mrow><msub><mrow><mi>λ</mi></mrow><mrow><mi>l</mi></mrow></msub><mo>≈</mo><mfrac><mrow><mn>2</mn><msub><mrow><mi>L</mi></mrow><mrow><mi>B</mi></mrow></msub></mrow><mrow><mi>l</mi></mrow></mfrac></mrow></math></span> for <span><math><mrow><mi>l</mi><mo>=</mo><mn>1</mn></mrow></math></span> to <span><math><mrow><mi>l</mi><mo>=</mo><msub><mrow><mi>N</mi></mrow><mrow><mi>S</mi></mrow></msub><mo>−</mo><mn>1</mn></mrow></math></span>. An additional broad transmission band is also shown to occur for <span><math><mrow><mi>δ</mi><mo>−</mo></mrow></math></span>well coupling strengths that cause the overall, spatially averaged potential to vanish. Even for random arrangements of <span><math><mrow><mi>δ</mi><mo>−</mo></mrow></math></span>wells within a barrier, nearly perfect transmission is predicted for the lowest transmission bands (i.e., largest <span><math><msub><mrow><mi>λ</mi></mrow><mrow><mi>l</mi></mrow></msub></math></span>). Numerical calculations also demonstrate that <span><math><mrow><mi>δ</mi><mo>−</mo></mrow></math></span>wells within a 1D barrier increase conductance over a wider range of barrier heights relative to the conductance through a 1D barrier without <span><math><mrow><mi>δ</mi><mo>−</mo></mrow></math></span>wells.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"169 ","pages":"Article 116200"},"PeriodicalIF":2.9,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143418911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

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Quantum Fisher information for a nanowire system with Rashba interaction under intrinsic damping 本征阻尼下具有Rashba相互作用的纳米线系统的量子Fisher信息

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-11 DOI: 10.1016/j.physe.2025.116197

Rabie I. Mohamed , Manal G. Eldin

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The electronic and piezoelectric properties of Janus monolayer MSi2X2Y2: A first-principles study Janus单层MSi2X2Y2的电子和压电性质：第一性原理研究

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-10 DOI: 10.1016/j.physe.2025.116211

Le Li, Depeng Zhang, Dongyan Liu, Hui Zhang

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Second harmonic generation and electronic properties in the septuple-atomic-layer MA2Z4 family 七原子层MA2Z4族的二次谐波产生及电子特性

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-07 DOI: 10.1016/j.physe.2025.116202

Yanyan Qian , Yadong Wei , Weiqi Li , Weiquan Tian , Jianqun Yang , XingJi Li , Jinluo Cheng

{"title":"Second harmonic generation and electronic properties in the septuple-atomic-layer MA2Z4 family","authors":"Yanyan Qian , Yadong Wei , Weiqi Li , Weiquan Tian , Jianqun Yang , XingJi Li , Jinluo Cheng","doi":"10.1016/j.physe.2025.116202","DOIUrl":"10.1016/j.physe.2025.116202","url":null,"abstract":"<div><div>Two-dimensional (2D) Janus monolayers represent a novel class of materials characterized by their unique structures and exceptional properties. The excitonic characteristics, along with the linear and nonlinear optical responses of the 2D MA<sub>2</sub>Z<sub>4</sub> family, have been systematically investigated through first-principles calculations. The findings indicate that monolayers of MSiGeN<sub>4</sub> (M = Mo or W) exhibit a pronounced second harmonic generation (SHG) response and notable infrared transmission capabilities, due to the breaking of mirror symmetry in these materials. A comparative analysis of the SHG response of intrinsic MSi<sub>2</sub>N<sub>4</sub> (M = Mo and W) monolayers demonstrates that Janus MSiGeN<sub>4</sub> (M = Mo and W) monolayers significantly enhance the SHG response, with enhancement factors of 5.5 and 3.8 at infrared wavelengths (1064 nm). The Janus monolayers also exhibit an additional out-of-plane response, thus enhancing the efficiency of incident light utilization from all directions. Specifically, the out-of-plane response of Janus WSiGeN<sub>4</sub> monolayers is 1.1 pm/V greater than the in-plane response of intrinsic WSi<sub>2</sub>N<sub>4</sub>. Furthermore, the dependence of SHG polarizability indicates that the out-of-plane polarizability significantly modifies the SHG response as a function of the incident angle <em>θ</em>. As a derivative of the 2D MA<sub>2</sub>Z<sub>4</sub> family, MSiGeN<sub>4</sub> (M = Mo and W) expands the scope of 2D Janus materials, and these findings may inform the design and synthesis of innovative 2D nonlinear optical materials.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"169 ","pages":"Article 116202"},"PeriodicalIF":2.9,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

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Transport evidence for the quantum Wigner solid formation in two-dimensional electron systems 二维电子系统中量子维格纳固体形成的输运证据

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-04 DOI: 10.1016/j.physe.2025.116192

A.A. Shashkin , M. Yu. Melnikov , S.V. Kravchenko

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GeO2 – ZnO nanocomposite rosettes for enhancement of performance in energy technologies: Coupling organic templated synthesis with microwave treatment 用于增强能源技术性能的GeO2 - ZnO纳米复合花环：有机模板化合成与微波处理耦联

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-04 DOI: 10.1016/j.physe.2025.116198

Shaan Bibi Jaffri , Khuram Shahzad Ahmad , Isaac Abrahams , Wahidah H. Al-Qahtani

{"title":"GeO2 – ZnO nanocomposite rosettes for enhancement of performance in energy technologies: Coupling organic templated synthesis with microwave treatment","authors":"Shaan Bibi Jaffri , Khuram Shahzad Ahmad , Isaac Abrahams , Wahidah H. Al-Qahtani","doi":"10.1016/j.physe.2025.116198","DOIUrl":"10.1016/j.physe.2025.116198","url":null,"abstract":"<div><div>Current study introduces first report on the sustainable synthesis of GeO<sub>2</sub> – ZnO nano-hetero-system copulated with the microwave treatment. GeO<sub>2</sub> – ZnO has been effectively tuned for the band gap causing an alleviation from 4.89 to 2.89 eV upon the nanocomposite formation. With the hexagonal phase, GeO<sub>2</sub> – ZnO possessed an average crystallite size of the 62.11 nm. These particles existed as nano-rossettes with the uniform upward projection. The catalytic performance of the synthesized material was more inclined towards pure hydrogen generation with the lower overpotential (<em>η</em><sub><em>HER</em></sub><em>)</em> and Tafel slopes <em>i.e.</em> 128 mV and 121.9 mV dec<sup>−1</sup>. GeO<sub>2</sub> – ZnO nano-rossettes bedecked electrode remained unscathed for a prolonged duration of the 1500 min and demonstrated commendable charge storage with the unit capacity of 384 mAH g<sup>−1</sup>. As a passivation layer in perovskite solar cells, these nanomaterials improved efficiency up to 15 % by prevention of the charge aggregation.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"169 ","pages":"Article 116198"},"PeriodicalIF":2.9,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143351158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

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Achieving n- and p-type Ohmic contacts in vertical graphene/CrSi2N4 heterostructure: Role of electric field 在垂直石墨烯/CrSi2N4异质结构中实现n型和p型欧姆接触：电场的作用

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-04 DOI: 10.1016/j.physe.2025.116201

Meng Chen , Shuo Liu , Mengying Zhao , Hong Li , Fengbin Liu

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Edge effect induce spin-gapless semiconducting and half-metallic properties of N-doped zigzag graphene nanoribbons 边缘效应诱导了氮掺杂之字形石墨烯纳米带的半导体和半金属性质

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-01 DOI: 10.1016/j.physe.2024.116172

Jiewen Min, Xingyuan Ou, Xiong Liu, Wenting Zou, Zhaoting Li, Liqin Deng, Yuanxiang Deng

{"title":"Edge effect induce spin-gapless semiconducting and half-metallic properties of N-doped zigzag graphene nanoribbons","authors":"Jiewen Min, Xingyuan Ou, Xiong Liu, Wenting Zou, Zhaoting Li, Liqin Deng, Yuanxiang Deng","doi":"10.1016/j.physe.2024.116172","DOIUrl":"10.1016/j.physe.2024.116172","url":null,"abstract":"<div><div>Graphene nanoribbons with mixed edge structures are promising candidate materials for the next generation of nanoelectronics due to their unique and peculiar physical and chemical properties, as well as their interesting and tunable electronic structures. Here, we designs and calculates a series of periodic edge N-doped ZGNRs using first principles calculations based on density functional theory. The band gap of these ZGNRs can be adjusted from metal to semiconductor, by the periodic length of the nanobands, and the number and interval distance of N atom doping. Among them, 6-ZGNR-(1,3) is a metallic, 6-ZGNR-(1,4) and 6-ZGNR-(2,4) are half-metallic, 6-ZGNR-(2,5) and 6-ZGNR-(3,5) are SGS, and 6-ZGNR-(3,6) is a magnetic semiconductor. We projected band structures into p<sub>x</sub> orbitals of edge C and N atoms separately, and found that the energy near the Fermi level in 6-ZGNR-(1,4) is mainly contributed by edge C atoms, while 6-ZGNR-(3,5) is contributed by edge N atoms. This indicates that N atom doping plays a major role in the transition of spin polarization properties. Our studies suggest that it will have significant theoretical significance and practical value in the application of spintronic devices.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"167 ","pages":"Article 116172"},"PeriodicalIF":2.9,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

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Comparison of various schemes to determine the Young’s modulus of disordered carbon nanomembranes compared to crystalline graphene 测定无序碳纳米膜与结晶石墨烯的杨氏模量的各种方案的比较

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-01 DOI: 10.1016/j.physe.2024.116170

Levin Mihlan, Julian Ehrens, Jürgen Schnack

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