Journal of physics. Condensed matter : an Institute of Physics journal最新文献_第10页

Lead-free tin halide perovskites: progress, photophysics, and applications in next-generation optoelectronics. 无铅卤化锡钙钛矿：进展、光物理学及其在下一代光电子学中的应用。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-09-08 DOI: 10.1088/1361-648X/ae9d0d

Atif Suhail, Md Abdul Karim, Chinmay Barman, Vishnuvardhan Reddy Chappidi, Ashraful Islam, Sai Santosh Kumar Raavi

{"title":"Lead-free tin halide perovskites: progress, photophysics, and applications in next-generation optoelectronics.","authors":"Atif Suhail, Md Abdul Karim, Chinmay Barman, Vishnuvardhan Reddy Chappidi, Ashraful Islam, Sai Santosh Kumar Raavi","doi":"10.1088/1361-648X/ae9d0d","DOIUrl":"10.1088/1361-648X/ae9d0d","url":null,"abstract":"Metal halide perovskites have transformed the landscape of photovoltaics (PVs) and optoelectronics due to their remarkable optical and electronic properties. Although lead (Pb)-based halide perovskites have shown exceptional power conversion efficiency and superior photoluminescence properties, environmental concerns about Pb toxicity have prompted research into Pb-free alternatives. Fortunately, among the Pb-free candidates, tin (Sn)-based halide perovskites (Sn-HPs) have emerged as potential candidates. Sn-HPs have an optimal bandgap, high charge carrier mobility, and long-lived hot carriers. However, the inherent instability of Sn2+, which readily oxidizes to Sn4+, poses significant challenges, leading to unintentional p-type doping, thereby degrading perovskites solar cells performance. Despite these challenges, recent progress in the stabilization of Sn2+, improvement of thin-film quality, and advancement in device engineering has significantly enhanced the performance and reliability of Sn-HPs. In this review, we systematically discuss the fundamental photophysical properties and strategies to mitigate intrinsic defects in tin halide perovskites across various structural modifications. Furthermore, advanced spectroscopic techniques, such as time-resolved spectroscopy, ultrafast transient absorption, and hot-carrier (HC) dynamics, enhance understanding of fundamental carrier dynamics and the potential of HC-based optoelectronic devices. Subsequently, we present recent advancements in achieving stable and efficient performance in light-emitting diodes, photodetectors, and PV technology, and provide perspectives on future developments.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148805329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Strain-induced quantum anomalous valley Hall phase in Janus FeClBr monolayer: effective model and crystal-field mechanism. Janus FeClBr单层中应变诱导的量子异常谷霍尔相：有效模型和晶体场机制。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-09-08 DOI: 10.1088/1361-648X/ae9fa8

Jing Wang, Wenli Zhang, Shiru Yang, Peixuan Liu, Bin Shao, Xu Zuo

{"title":"Strain-induced quantum anomalous valley Hall phase in Janus FeClBr monolayer: effective model and crystal-field mechanism.","authors":"Jing Wang, Wenli Zhang, Shiru Yang, Peixuan Liu, Bin Shao, Xu Zuo","doi":"10.1088/1361-648X/ae9fa8","DOIUrl":"10.1088/1361-648X/ae9fa8","url":null,"abstract":"Achieving the coexistence of valley polarization and nontrivial band topology is a central challenge in two-dimensional (2D) valleytronics. Here, we combine first-principles calculations, an effectivemodel, and crystal-field analysis to develop a unified physical picture of biaxial-strain-driven topological phase transitions in the Janus ferrovalley monolayer FeClBr. First-principles calculations reveal a complete phase-transition sequence. A strain-dependent two-bandmodel yields the condition for topological nontriviality-opposite signs of the renormalized band gaps at the two valleys-reproducing the full five-stage sequence within a minimal framework. Crystal-field analysis further identifies the microscopic origin: strain, through symmetry-selective modulation, drives orbital inversion, while spin-orbit coupling imparts valley-dependent effective-gap shifts that cause the inversions to occur at different critical strains, opening a topologically nontrivial window between them. Our work establishes a complete causal chain from strain to topology and offers general design guidelines for engineering topological valley-polarized states in related 2D magnetic materials.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148842763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

First principles calculations of electric field driven topological phase transitions in silicene, germanene and stanene. 电场驱动硅烯、锗烯和斯坦烯拓扑相变的第一性原理计算。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-09-08 DOI: 10.1088/1361-648X/ae9e75

Julián Antonio Villarreal Murúa, Pablo Roura-Bas, Javier Daniel Fuhr, Ricardo Faccio

{"title":"First principles calculations of electric field driven topological phase transitions in silicene, germanene and stanene.","authors":"Julián Antonio Villarreal Murúa, Pablo Roura-Bas, Javier Daniel Fuhr, Ricardo Faccio","doi":"10.1088/1361-648X/ae9e75","DOIUrl":"10.1088/1361-648X/ae9e75","url":null,"abstract":"The emergence of two-dimensional topological materials, particularly the group-14 monolayers known as silicene, germanene, and stanene has opened promising pathways for next-generation nanoelectronics and spintronics. Their buckled honeycomb structure and strong spin-orbit coupling allow for bandgap engineering via a perpendicular electric field, leading to topological phase transitions (TPTs) from non-trivial to trivial insulating states. However, precise determination of the critical electric fieldat which these transitions occur remains challenging, with tight-binding (TB) models often underestimating these values. Here, we present a first-principles framework that combines density-functional theory, maximally localized Wannier functions, and evolution of the Wannier charge centers to accurately characterize TPTs in silicene, germanene, and stanene through thetopological invariant. In contrast to earlier work, at each electric-field strength we run fully self-consistentab initiosimulations to obtain the screened electronic structure, accounting for the material's dielectric response from both electrons and ions. From these converged results we construct a Wannier TB Hamiltonian at each electric field strength, which then enables a gauge-invariant calculation of thetopological invariant. This methodology yields significantly more accurate numerical predictions of-andfor silicene and germanene, respectively-and provides deeper insight into the interplay between electronic structure and topological order. Compared to previous approaches, our framework delivers a marked quantitative improvement for predicting topological phase boundaries, essential for guiding the design of topological field-effect transistors and electrostatically controlled quantum devices based on two-dimensional materials.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148820832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Further indications of Tomonaga-Luttinger liquid behavior in the complex Au/Ge(001) surface structure. Au/Ge（001）络合物表面结构中Tomonaga-Luttinger液体行为的进一步迹象。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-09-08 DOI: 10.1088/1361-648X/aea04a

Nico Kubetschek, Johann Tonhäuser, Till-Jakob Stehling, Marcel Schlesag, Ulrike Kürpick, René Matzdorf

引用次数: 0

Josephson effect of massive pseudospin-1 fermions in the ferromagneticα-T3model. 铁磁α- t3模型中大质量伪自旋-1费米子的约瑟夫森效应。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-09-07 DOI: 10.1088/1361-648X/ae9e78

Mengyao Li, Zixuan Ding, Hao Fu

引用次数: 0

Fabrication and characterization of high-temperature superconducting nanobridges using a thermal scanning probe. 高温超导纳米电桥的热扫描探针制备与表征。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-09-07 DOI: 10.1088/1361-648X/ae9fa9

Ngoc My Hanh Duong, Amanuel M Berhane, Dave Mitchell, Rifat Ullah, Ting Zhang, He Zhu, Jia Du, Simon K H Lam, Emma E Mitchell, Avi Bendavid

引用次数: 0

Recent progress in prediction of vapor pressure: addressing the trade-off between accuracy and generalizability. 蒸汽压预测的最新进展：解决准确性和概括性之间的权衡。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-09-07 DOI: 10.1088/1361-648X/ae9857

Xurui Li, Zhiguo Gan, Hongxiang Zhu, Jiaming Zhang, Han Wang, Diannan Lu

{"title":"Recent progress in prediction of vapor pressure: addressing the trade-off between accuracy and generalizability.","authors":"Xurui Li, Zhiguo Gan, Hongxiang Zhu, Jiaming Zhang, Han Wang, Diannan Lu","doi":"10.1088/1361-648X/ae9857","DOIUrl":"10.1088/1361-648X/ae9857","url":null,"abstract":"Accurate vapor pressure is of fundamental importance for the design of chemical engineering equipment and process optimization. Over the past century, researchers have developed various vapor pressure models based on theory, semi-empirical methods, corresponding states principles, and data-driven approaches. However and unfortunately, they have always faced a trade-off between accuracy and generalizability. In this work, we present a systematic review of the current research in the prediction of vapor pressure. Firstly, we categorize and summarize the four main types of existing vapor pressure models, analyzing their theoretical bases and ranges of applicability. Secondly, by evaluating these models against a comprehensive database of 629 compounds, we expose the shortcomings of each approach. For example, the empirical equations achieve very high accuracy but rely heavily on fitted experimental data. The corresponding state models are relatively general, but offer only limited accuracy. And the emerging graph neural network models remain in their early stages, showing poor adherence to thermodynamic constraints and requiring further improvements in modeling. To surmount the current bottleneck, we believe that the crucial approach lies in organically incorporating physical knowledge into machine learning algorithms, which in turn facilitates the construction of novel models with intrinsic satisfaction of thermodynamic constraints. We envision that future efforts will yield a new generation of vapor pressure models combining high accuracy with generalizability, thereby being applied to the accurate and precise prediction of the vapor pressure of different types of substances.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148715177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Diffusion-reaction model for positron trapping and annihilation at grain boundaries of rectangular-shaped columnar grains. 矩形柱状晶粒晶界正电子捕获和湮灭的扩散反应模型。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-09-07 DOI: 10.1088/1361-648X/ae9d0e

Roland Würschum, Marcel Simhofer

{"title":"Diffusion-reaction model for positron trapping and annihilation at grain boundaries of rectangular-shaped columnar grains.","authors":"Roland Würschum, Marcel Simhofer","doi":"10.1088/1361-648X/ae9d0e","DOIUrl":"10.1088/1361-648X/ae9d0e","url":null,"abstract":"The present work aims at an extension of the diffusion-reaction model to two spatial variables for treating positron trapping and annihilation at grain boundaries (GBs) of polycrystals with grains of rectangular column shape. Analytical solutions for the positron lifetime spectrum and the mean positron lifetime are derived taking into account concomitant transition-limited positron trapping at intragranular point defects. Despite the two-dimensional nature of the diffusion-reaction problem, single-sum expressions could be deduced for the characteristic positron annihilation parameters. The relevant limiting cases are considered, i.e. entirely reaction-limitation, yielding the solution of standard rate theory, entirely diffusion-limitation as well as entirely reaction-limitation in one direction when the extension of the rectangular column in this direction is much shorter than in the other. The present model contains the known solution for the platelet structure as the limiting case of infinite extension of the rectangular cross-section in one direction. In the regime of reaction-controlled trapping, the positron trapping rate at GBs is determined by the ratio between perimeter and cross-section of the columnar-shaped grains. Besides this geometric ratio, the shape of the columns (square-, rectangular-, cylindrical-shaped) becomes relevant, when positron trapping rate at GBs is in addition diffusion-limited.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148805355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Noncoplanar antiferromagnetism and quantum topological Hall effect in quarter-electron-filled triangular-lattice K0.5RuO2. 四分之一电子填充三角形晶格K0.5RuO2中的非共面反铁磁性和量子拓扑霍尔效应。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-09-04 DOI: 10.1088/1361-648X/ae9e77

Kai-Ying Yang, Y B Chen, Qi-Feng Liang, Jian Zhou

{"title":"Noncoplanar antiferromagnetism and quantum topological Hall effect in quarter-electron-filled triangular-lattice K0.5RuO2.","authors":"Kai-Ying Yang, Y B Chen, Qi-Feng Liang, Jian Zhou","doi":"10.1088/1361-648X/ae9e77","DOIUrl":"10.1088/1361-648X/ae9e77","url":null,"abstract":"Transition-metal compounds with triangular lattices exhibit a rich interplay among electron filling, geometric frustration, and electronic correlations, making them an ideal platform for realizing exotic quantum states. Here, using first-principles calculations, we demonstrate that the layered triangular-lattice compound KRuOstabilizes a noncoplanar antiferromagnetic state that was previously predicted in a quarter-electron-filled Kondo-lattice model on a triangular lattice. This unconventional chiral magnetic order gives rise to a quantum topological Hall effect (QTHE), namely a quantum anomalous Hall effect driven by noncoplanar spin textures. The resulting topological phase is characterized by a Chern number, which originates from the two RuOlayers in the unit cell. The QTHE phase in KRuOemerges at 1/4 filling, distinct from the 3/4-filled case where the chiral magnetic order arises from perfect Fermi-surface nesting. Furthermore, based on the modern theory of orbital magnetization, we show that the orbital magnetization varies linearly with the Fermi energy within the topological band gap, providing concrete evidence of the chiral edge states associated with the QTHE phase. These findings establish KRuOas a promising material platform for realizing chiral magnetic topological states in quarter-electron-filled triangular-lattice systems and offer guidance for future experimental and theoretical studies of topological chiral antiferromagnets.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148820878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Zero-net-magnetization hybrid magnet. 零净磁化混合磁体。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-09-04 DOI: 10.1088/1361-648X/ae9dd2

San-Dong Guo, Shi-Hao Zhang

{"title":"Zero-net-magnetization hybrid magnet.","authors":"San-Dong Guo, Shi-Hao Zhang","doi":"10.1088/1361-648X/ae9dd2","DOIUrl":"10.1088/1361-648X/ae9dd2","url":null,"abstract":"Zero-net-magnetization magnets possess ultradense and ultrafast application potential, benefiting from their intrinsic zero stray field and terahertz dynamics characteristics. Herein, we propose the concept of zero-net-magnetization hybrid magnet, in which magnetic atoms with opposite spin polarization are partially coupled via spatial inversion () symmetry, partially via rotation/mirror () symmetry or partially without any symmetry correlation. From a local perspective and neglecting the interactions between local regions, hybrid magnet can be regarded as being composed of-antiferromagnet (possessing the combined symmetry () ofand time-reversal ()), altermagnet, or fully compensated ferrimagnet. To realize hybrid magnet, we propose that such system can be constructed by forming heterojunction with three types of zero-net-magnetization magnetic monolayers. We mainly investigate the heterojunction composed of two kinds of zero-net-magnetization magnets, among which one type corresponds to fully compensated ferrimagnet. When heterojunction hybrid magnet exhibits a type-II band alignment, only one of electron doping and hole doping can induce a net magnetic moment, while the other hardly generates any net magnetization. Taking the heterojunction constructed by-antiferromagnet and fully compensated ferrimagnet as an example, we verify our proposal by means of the tight-binding (TB) model. Finally, taking the/heterojunction as an example, we perform first-principles calculations combined with electric field variation to validate our TB model and theoretical proposal. Lastly, we also note that both hidden altermagnets and surface altermagnets qualify as special zero-net-magnetization hybrid magnets.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148815369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0