Frontiers of Physics最新文献

Interlayer ferromagnetic coupling in nonmagnetic elements doped CrI3 thin films 掺杂非磁性元素的 CrI3 薄膜中的层间铁磁耦合

IF 6.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2024-08-09 DOI: 10.1007/s11467-024-1435-2

Xuqi Li, Xuyan Chen, Shi-Huai Sun, Huihui Zhang, Haidan Sang, Xiaonan Wang, Shifei Qi, Zhenhua Qiao

引用次数: 0

Magnon, doublon and quarton excitations in 2D S=1/2 trimerized Heisenberg models 二维 S=1/2 三元海森堡模型中的磁子、双子和夸子激元

IF 7.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2024-07-27 DOI: 10.1007/s11467-024-1418-3

Yue-Yue Chang, Jun-Qing Cheng, Hui Shao, Dao-Xin Yao, Han-Qing Wu

{"title":"Magnon, doublon and quarton excitations in 2D S=1/2 trimerized Heisenberg models","authors":"Yue-Yue Chang, Jun-Qing Cheng, Hui Shao, Dao-Xin Yao, Han-Qing Wu","doi":"10.1007/s11467-024-1418-3","DOIUrl":"https://doi.org/10.1007/s11467-024-1418-3","url":null,"abstract":"We investigate the magnetic excitations of the two-dimensional (2D) S = 1/2 trimerized Heisenberg models with intratrimer interaction J1 and intertrimer interaction J2 on four different lattices using a combination of stochastic series expansion quantum Monte Carlo (SSE QMC) and stochastic analytic continuation methods (SAC), complemented by cluster perturbation theory (CPT). These models exhibit quasi-particle-like excitations when g = J2/J1 is weak, characterized by low-energy magnons, intermediate-energy doublons, and high-energy quartons. The low-energy magnons are associated with the magnetic ground states. They can be described by the linear spin wave theory (LSWT) of the effective block spin model and the original spin model. Doublons and quartons emerge from the corresponding internal excitations of the trimers with distinct energy levels, which can be effectively analyzed using perturbative calculation when the ratio of exchange interactions g is weak. In this weak g regime, we observe a clear separation between the magnon and higher-energy spectra. As g increases, doublon and quarton gradually merge into the magnon modes or some continua. Notably, in the Collinear II and trimerized Hexagon lattice, a broad continuum emerges above the single-magnon spectrum, originating from the quasi-1D physics due to the dilute connections between chains. In addition, we also compare our numerical results to the experimental RIXS spectrum and analyze the difference. Our numerical analysis of these 2D trimers yields valuable theoretical predictions and explanations for the inelastic neutron scattering (INS) spectra of 2D magnetic materials featuring trimerized lattices.","PeriodicalId":573,"journal":{"name":"Frontiers of Physics","volume":null,"pages":null},"PeriodicalIF":7.5,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780310","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

Recent advances of light-field modulated operation in laser-induced breakdown spectroscopy 激光诱导击穿光谱中光场调制操作的最新进展

IF 7.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2024-07-26 DOI: 10.1007/s11467-024-1436-1

Shangyong Zhao, Yuchen Zhao, Yujia Dai, Ziyuan Liu, Huihui Zha, Xun Gao

引用次数: 0

Temperature dependence of positive and negative magnetoresistances of tantalum-covered multiwalled carbon nanotubes 钽包覆多壁碳纳米管正负磁阻的温度依赖性

IF 7.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2024-07-25 DOI: 10.1007/s11467-024-1432-5

Julienne Impundu, Wenxiang Wang, Zheng Wei, Yushi Xu, Yu Wang, Jiawang You, Wenbin Huang, Yong Jun Li, Lianfeng Sun

引用次数: 0

Key electronic parameters of 2H-stacking bilayer MoS2 on sapphire substrate determined by terahertz magneto-optical measurement in Faraday geometry 通过法拉第几何太赫兹磁光测量确定蓝宝石衬底上 2H 堆积双层 MoS2 的关键电子参数

IF 6.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2024-07-18 DOI: 10.1007/s11467-024-1425-4

Xingjia Cheng, Wen Xu, Hua Wen, Jing Zhang, Heng Zhang, Haowen Li, François M. Peeters

引用次数: 0

First-principles investigation of two-dimensional iron molybdenum nitride: A double transition-metal cousin of MoSi2N4(MoN) monolayer with distinctive electronic and topological properties 二维氮化钼铁的第一性原理研究：具有独特电子和拓扑特性的 MoSi2N4（MoN）单层双过渡金属表层

IF 6.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2024-07-18 DOI: 10.1007/s11467-024-1431-6

Yi Ding, Yanli Wang

引用次数: 0

Multi-conditioned controlled growth of CoBi nanostructures on SrTiO3 钴铋纳米结构在 SrTiO3 上的多条件受控生长

IF 6.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2024-07-17 DOI: 10.1007/s11467-024-1423-6

Desheng Cai, Yumin Xia, Pengju Li, Kun Xie, Yuzhou Liu, Yitong Gu, Gan Yu, Changgan Zeng, Ping Cui, Shengyong Qin

引用次数: 0

Giant anomalous transverse transport properties of Co-doped two-dimensional Fe3GaTe2 掺杂 Co 的二维 Fe3GaTe2 的巨型反常横向输运特性

IF 7.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2024-07-12 DOI: 10.1007/s11467-024-1424-5

Imran Khan, Jisang Hong

{"title":"Giant anomalous transverse transport properties of Co-doped two-dimensional Fe3GaTe2","authors":"Imran Khan, Jisang Hong","doi":"10.1007/s11467-024-1424-5","DOIUrl":"https://doi.org/10.1007/s11467-024-1424-5","url":null,"abstract":"In spintronics, transverse anomalous transport properties have emerged as a highly promising avenue surpassing the conventional longitudinal transport behaviors. Here, we explore the transverse transport properties of monolayer and bilayer Fe3−xCoxGaTe2 (x = 0.083, 0.167, 0.250, and 0.330) systems. All the systems exhibit ferromagnetic ground states with metallic features and also have perpendicular magnetic anisotropy. Besides, the magnetic anisotropy is substantially enhanced with increasing Co-doping concentration. However, unlike magnetic anisotropy, the Curie temperature is suppressed by increasing the Co-doping concentration. For instance, the monolayer and bilayer Fe2.917Co0.083GaTe2 hold a Curie temperature of 253 K and 269 K, which decreases to 163 K and 173 K in monolayer and bilayer Fe2.67Co0.33GaTe2 systems, respectively. We find a giant anomalous Nernst conductivity (ANC) of 6.03 A/(K·m) in the monolayer Fe2.917Co0.083GaTe2 at −30 meV, and this is further enhanced to 11.30 A/(K·m) in the bilayer Fe2.917Co0.083GaTe2 at −20 meV. Moreover, the bilayer Fe2.917Co0.083GaTe2 structure has a large anomalous thermal Hall conductivity (ATHC) of −0.14 W/(K·m) at 100 K. Overall, we find that the Fe3−xCoxGaTe2 (x = 0.083, 0.167, 0.250, and 0.330) structures have better anomalous transverse transport performance than the pristine Fe3GaTe2 system and can be used for potential spintronics and spin caloritronics applications.","PeriodicalId":573,"journal":{"name":"Frontiers of Physics","volume":null,"pages":null},"PeriodicalIF":7.5,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141612592","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

Emerging single-photon detection technique for high-performance photodetector 用于高性能光电探测器的新兴单光子探测技术

IF 7.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2024-07-12 DOI: 10.1007/s11467-024-1428-1

Jinxiu Liu, Zhenghan Peng, Chao Tan, Lei Yang, Ruodan Xu, Zegao Wang

{"title":"Emerging single-photon detection technique for high-performance photodetector","authors":"Jinxiu Liu, Zhenghan Peng, Chao Tan, Lei Yang, Ruodan Xu, Zegao Wang","doi":"10.1007/s11467-024-1428-1","DOIUrl":"https://doi.org/10.1007/s11467-024-1428-1","url":null,"abstract":"Single-photon detections (SPDs) represent a highly sensitive light detection technique capable of detecting individual photons at extremely low light intensity levels. This technology mainly relies on the mainstream SPDs, such as photomultiplier tubes (PMTs), avalanche photodiodes (SAPD), superconducting nanowire single-photon detectors (SNSPDs), superconducting transition-edge sensor (TES), and hybrid lead halide perovskite. However, the complexity and high manufacturing cost, coupled with the requirement of special conditions like a low-temperature environment, pose significant challenges to the wide adoption of SPDs. To address the challenges faced by SPDs, significant efforts have been devoted to enhancing their performance. In this review, we first summarize the principles and technical challenges of several SPDs. Conductors, superconductors, semiconductors, 3D bulk materials, 2D film materials, 1D nanowires, and 0D quantum dots have all been discussed for single-photon detectors. Methods such as special optical structure, waveguide integration, and strain engineering have been employed to elevate the performance of single-photon detectors. These techniques enhance light absorption and modulate the band structure of the material, thereby improving the single-photon sensitivity. By providing an overview of the current situation and future challenges of SPDs, this review aims to propose potential solutions for photon detection technology.","PeriodicalId":573,"journal":{"name":"Frontiers of Physics","volume":null,"pages":null},"PeriodicalIF":7.5,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141612584","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

Machine learning in laser-induced breakdown spectroscopy: A review 激光诱导击穿光谱学中的机器学习：综述

IF 7.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2024-07-12 DOI: 10.1007/s11467-024-1427-2

Zhongqi Hao, Ke Liu, Qianlin Lian, Weiran Song, Zongyu Hou, Rui Zhang, Qianqian Wang, Chen Sun, Xiangyou Li, Zhe Wang

{"title":"Machine learning in laser-induced breakdown spectroscopy: A review","authors":"Zhongqi Hao, Ke Liu, Qianlin Lian, Weiran Song, Zongyu Hou, Rui Zhang, Qianqian Wang, Chen Sun, Xiangyou Li, Zhe Wang","doi":"10.1007/s11467-024-1427-2","DOIUrl":"https://doi.org/10.1007/s11467-024-1427-2","url":null,"abstract":"Laser-induced breakdown spectroscopy (LIBS) is a spectroscopic analytic technique with great application potential because of its unique advantages for online/in-situ detection. However, due to the spatially inhomogeneity and drastically temporal varying nature of its emission source, the laser-induced plasma, it is difficult to find or hard to generate an appropriate spatiotemporal window for high repeatable signal collection with lower matrix effects. The quantification results of traditional physical principle based calibration model are unsatisfactory since these models were not able to compensate for complicate matrix effects as well as signal fluctuation. Machine learning is an emerging approach, which can intelligently correlated the complex LIBS spectral data with its qualitative or/and quantitative composition by establishing multivariate regression models with greater potential to reduce the impacts of signal fluctuation and matrix effects, therefore achieving relatively better qualitative and quantitative performance. In this review, the progress of machine learning application in LIBS is summarized from two main aspects: i) Pre-processing data for machine learning model, including spectral selection, variable reconstruction, and denoising to improve qualitative/quantitative performance; ii) Machine learning methods for better quantification performance with reduction of the impact of matrix effect as well as LIBS spectra fluctuations. The review also points out the issues that researchers need to address in their future research on improving the performance of LIBS analysis using machine learning algorithms, such as restrictions on training data, the disconnect between physical principles and algorithms, the low generalization ability and massive data processing ability of the model.","PeriodicalId":573,"journal":{"name":"Frontiers of Physics","volume":null,"pages":null},"PeriodicalIF":7.5,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141612581","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