Journal of Physics: Condensed Matter最新文献_第8页

Unusual spin dynamics in the van der Waals antiferromagnet FeGa₂S₄. 范德华反铁磁体 FeGa2S4 中不寻常的自旋动力学。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-10-28 DOI: 10.1088/1361-648X/ad861a

Yifei Tang, Yoshihiko Umemoto, Yo Kawamoto, Masahiro Kawamata, Shinichiro Asai, Yoichi Ikeda, Masaki Fujita, Yusuke Nambu

引用次数: 0

What can we learn from the experiment of electrostatic conveyor belt for excitons? 我们能从激子静电传送带实验中学到什么？

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-10-28 DOI: 10.1088/1361-648X/ad81a7

T T Zhao, Rui Li, C S Liu

{"title":"What can we learn from the experiment of electrostatic conveyor belt for excitons?","authors":"T T Zhao, Rui Li, C S Liu","doi":"10.1088/1361-648X/ad81a7","DOIUrl":"10.1088/1361-648X/ad81a7","url":null,"abstract":"Motivated by the experiment of electrostatic conveyor belt for indirect excitons (Winbowet al2011Phys. Rev. Lett.106196806), we studied the exciton patterns for understanding the exciton dynamics. By analyzing the exciton diffusion, we found that the patterns mainly came from the photoluminescence of two kinds of excitons. The patterns near the laser spot came from the hot excitons which can be regarded as the classical particles. However, the patterns far from the laser spot come from the cooled or coherent excitons. Considering the finite lifetime of Bosonic excitons and of the interactions between them, we built a time-dependent nonlinear Schrödinger equation including the non-Hermitian dissipation to describe the coherent exciton dynamics. The real-time and imaginary-time evolutions were used alternately to solve the Schrödinger equation to simulate the exciton diffusion accompanied by the exciton cooling in the moving lattices. By calculating the escape probability, we obtained the transport distances of the coherent excitons in the conveyor, consistent with the experimental data. The cooling speed of excitons was found to be important in coherent exciton transport. Moreover, the plateau in the average transport distance cannot be explained by the dynamical localization-delocalization transition induced by the disorders.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142348893","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

Layer-number and strain effects on the structural and electronic properties of PtSe₂material. 层数和应变对 PtSe2 材料结构和电子特性的影响。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-10-28 DOI: 10.1088/1361-648X/ad8697

Rania Amairi, Adlen Smiri, Sihem Jaziri

{"title":"Layer-number and strain effects on the structural and electronic properties of PtSe2material.","authors":"Rania Amairi, Adlen Smiri, Sihem Jaziri","doi":"10.1088/1361-648X/ad8697","DOIUrl":"https://doi.org/10.1088/1361-648X/ad8697","url":null,"abstract":"Bandgap engineering of low-dimensional materials forms a robust basis for advancements in optoelectronic technologies. Platinum diselenide (PtSe2) material exhibits a transition from semi-metal to semiconductor (SM-SC) when going from bulk to monolayer. In this work, density functional theory (DFT) with various van der Waals (vdW) corrections has been tested to study the effect of the layer-number on the structural and electronic properties of the PtSe2material. The considered vdW corrections gave different results regarding the number of layers at which the SM-SC transition occurs. This variation is due to the different interlayer distances found for each correction, revealing the sensitivity of the bandgap to this distance in addition to the layer number. In fact, the bandgap increases with the increasing of the interlayer distance, due to the energy shift of conduction and valence bands dominated by Se-pzorbitals. According to the comparison with the available experimental data, the vdW corrections vdW-DF and rVV10 gave the most accurate results. Moreover, the control of the interlayer distance via vertical compressive strain led to the bandgap tuning of semiconductor PtSe2BL. Indeed, a semi-metal character of PtSe2BL can be obtained under 17% vertical strain. Our work shows a deep understanding of the correlation between the structural and electronic properties, and thus a possibility to tune the bandgap by strain means.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":"37 3","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142502600","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

Isolation and characterisation of monolayer phosphorene analogues. 单层磷烯类似物的分离与表征。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-10-25 DOI: 10.1088/1361-648X/ad81a1

Nicolas Gauriot, Raj Pandya, Jack Alexander-Webber, Akshay Rao

引用次数: 0

Special-point approach for optical absorption coefficient calculations on two-dimensional self-assemblies of type-II perovskite quantum dots. 特殊点法计算 II 型包晶量子点二维自组装的光学吸收系数。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-10-23 DOI: 10.1088/1361-648X/ad8716

C I Cabrera, R Pérez-Álvarez

{"title":"Special-point approach for optical absorption coefficient calculations on two-dimensional self-assemblies of type-II perovskite quantum dots.","authors":"C I Cabrera, R Pérez-Álvarez","doi":"10.1088/1361-648X/ad8716","DOIUrl":"10.1088/1361-648X/ad8716","url":null,"abstract":"All-inorganic perovskite quantum dots with the usual cubic shape have emerged as a successful and low-cost alternative to electronically functional nanomaterials motivating various fields of applications, including high-efficiency photovoltaics. Here, we present an efficient and almost analytic approach for optical absorption coefficient calculation on self-assembled perovskite quantum dot films with type-II band alignment. The approach takes advantage of the special point technique for integration over the two-dimensional Brillouin zone, which minimizes the computational cost. The set of special wave-vector points is generated using the Monkhorst and Pack method. The optical absorption spectrum for phenyl-C60-butyric acid methyl ester (PCBM)/CsPbI3quantum dot films is computed, in good agreement with the experiment assuming a homogeneous linewidth of 50 meV and considering a ten special-point set. We show that light absorption in these systems is a cooperative optoelectronic property resulting from the quantum-mechanical coupling between perovskite nanocubes, leading to extended system states. The generality of this approach makes it suitable for calculating the optical absorption coefficient in a broad class of perovskite quantum dot systems.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142468306","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

Multivariate growth analysis on D0₁₉-phase Mn₃Ga kagome-based topological antiferromagnets. 基于 D019 相 Mn3Ga 卡戈梅拓扑反铁磁体的多变量生长分析。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-10-23 DOI: 10.1088/1361-648X/ad81a4

Wei-Chih Chang, Anqi Cheng, Yangjun Gao, Feiya Xu, Xu Li, Yaping Wu, Zhiming Wu, Junyong Kang

引用次数: 0

Deciphering competing interactions of Kitaev-Heisenberg-Γ system in clusters: II. Dynamics of Majorana fermions. 解密集群中基塔耶夫-海森伯-texorpdfstring{$Gamma$}系统的竞争相互作用：第二部分--马约拉纳费米子的动力学。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-10-22 DOI: 10.1088/1361-648X/ad841b

Sheikh Moonsun Pervez, Saptarshi Mandal

引用次数: 0

Fundamental theory of current-induced motion of magnetic skyrmions. 电流诱导磁天目运动的基本理论。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-10-21 DOI: 10.1088/1361-648X/ad861b

Yuto Ohki, Masahito Mochizuki

{"title":"Fundamental theory of current-induced motion of magnetic skyrmions.","authors":"Yuto Ohki, Masahito Mochizuki","doi":"10.1088/1361-648X/ad861b","DOIUrl":"10.1088/1361-648X/ad861b","url":null,"abstract":"Magnetic skyrmions are topological spin textures that appear in magnets with broken spatial inversion symmetry as a consequence of competition between the (anti)ferromagnetic exchange interactions and the Dzyaloshinskii-Moriya interactions in a magnetic field. In the research of spintronics, the current-driven dynamics of skyrmions has been extensively studied aiming at their applications to next-generation spintronic devices. However, current-induced skyrmion motion exhibits diverse behaviors depending on various factors and conditions such as the type of skyrmion, driving mechanism, system geometry, direction of applied current, and type of the magnet. While this variety attracts enormous research interest of fundamental science and enriches their possibilities of technical applications, it is, at the same time, a source of difficulty and complexity that hinders their comprehensive understandings. In this article, we discuss fundamental and systematic theoretical descriptions of current-induced motion of skyrmions driven by the spin-transfer torque and the spin-orbit torque. Specifically, we theoretically describe the behaviors of current-driven skyrmions depending on the factors and conditions mentioned above by means of analyses using the Thiele equation. Furthermore, the results of the analytical theory are visually demonstrated and quantitatively confirmed by micromagnetic simulations using the Landau-Lifshitz-Gilbert-Slonczewski equation. In particular, we discuss dependence of the direction and velocity of motion on the type of skyrmion (Bloch type and Néel type) and its helicity, the system geometry (thin plate and nanotrack), the direction of applied current (length and width direction of the nanotrack) and its spin-polarization orientation, and the type of magnet (ferromagnet and antiferromagnet). The comprehensive theory provided by this article is expected to contribute significantly to research on the manipulation and control of magnetic skyrmions by electric currents for future spintronics applications.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142406527","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

Non-equilibrium dynamic hyperuniform states. 非平衡动态超均匀状态。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-10-21 DOI: 10.1088/1361-648X/ad83a0

Yusheng Lei, Ran Ni

引用次数: 0

Computational electron-phonon superconductivity: from theoretical physics to material science. 计算电子-声子超导：从理论物理学到材料科学。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-10-18 DOI: 10.1088/1361-648X/ad81a3

Shiya Chen, Feng Zheng, Zhen Zhang, Shunqing Wu, Kai-Ming Ho, Vladimir Antropov, Yang Sun

{"title":"Computational electron-phonon superconductivity: from theoretical physics to material science.","authors":"Shiya Chen, Feng Zheng, Zhen Zhang, Shunqing Wu, Kai-Ming Ho, Vladimir Antropov, Yang Sun","doi":"10.1088/1361-648X/ad81a3","DOIUrl":"10.1088/1361-648X/ad81a3","url":null,"abstract":"The search for room-temperature superconductors is a major challenge in modern physics. The discovery of copper-oxide superconductors in 1986 brought hope but also revealed complex mechanisms that are difficult to analyze and compute. In contrast, the traditional electron-phonon coupling (EPC) mechanism facilitated the practical realization of superconductivity (SC) in metallic hydrogen. Since 2015, the discovery of new hydrogen compounds has shown that EPC can enable room-temperature SC under high pressures, driving extensive research. Advances in computational capabilities, especially exascale computing, now allow for the exploration of millions of materials. This paper reviews newly predicted superconducting systems in 2023-2024, focusing on hydrides, boron-carbon systems, and compounds with nitrogen, carbon, and pure metals. Although many computationally predicted high-Tcsuperconductors were not experimentally confirmed, some low-temperature superconductors were successfully synthesized. This paper provides a review of these developments and future research directions.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142348876","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