Journal of Physics: Condensed Matter最新文献_第4页

Magnetic Order in Nanogranular Iron Germanium (Fe0.53Ge0.47) Films. 纳米粒状铁锗（Fe0.53Ge0.47）薄膜中的磁序。

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/ad8c0a

Ruthi Linnea Zielinski, Nhat Nguyen, Bryce Herrington, Amir Tarkian, Omar Ahmed Hassan Ahmed Taha, Wai Kiat Chin, Ather Mahmood, Xiaoqian Chen, Christoph Klewe, Padraic Shafer, Jim Ciston, Paul Ashby, Claudio Mazzoli, Robert Streubel

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":null,"pages":null},"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

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":null,"pages":null},"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

From Weak- to Strong-Coupling Superconductivity in the AlB2-Type Solid Solution SrGa1-xAlxGe with Honeycomb Layers. 具有蜂巢层的 AlB2 型固溶体 SrGa1-xAlxGe 中从弱耦合到强耦合的超导性。

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/ad8c0b

Dorota I Iwona Walicka, Olivier Blacque, Tomasz Klimczuk, Fabian Von Rohr

{"title":"From Weak- to Strong-Coupling Superconductivity in the AlB2-Type Solid Solution SrGa1-xAlxGe with Honeycomb Layers.","authors":"Dorota I Iwona Walicka, Olivier Blacque, Tomasz Klimczuk, Fabian Von Rohr","doi":"10.1088/1361-648X/ad8c0b","DOIUrl":"https://doi.org/10.1088/1361-648X/ad8c0b","url":null,"abstract":"We report on the structure and the superconducting properties of 9-electron 111 compounds with honeycomb layers, namely SrGaGe, SrAlGe, and the SrGa1-x AlxGe solid solution. By means of single-crystal X-ray diffraction we show that, on one hand, SrGaGe  crystallizes into the centrosymmetric P6/mmm space group (a = 4.2555(2) ˚A, c = 4.7288(2) ˚A) with statistical disorder in the [GaGe]2- 6 honeycomb layers. On the other hand, we confirm that SrAlGe crystallizes in a non-centrosymmetric space group, namely P6m2 (a = 4.2942(1) ˚A, c = 4.7200(2) ˚A) with fully ordered [AlGe]2- 6 honeycomb layers. By using magnetization and specific heat measurements, we show that the superconducting properties of SrGaGe and SrAlGe differ significantly from each other. SrGaGe is a superconductor with a critical temperature of Tc = 2.6 K falling into the weak coupling limit, while SrAlGe has a Tc = 6.7 K and can be classified in the strong coupling limit. By realizing the SrGa1-x AlxGe solid solution, we were able to investigate the transition between  the different crystal structures as well as the evolution of the electronic properties. We show that the transition from the weak to the strong coupling superconductivity in this system is likely associated with the disorder-to-order transition of the honeycomb layer, along with the loss of the inversion center in the crystal structure.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142522207","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

Hot carrier transfer from plasmon decay in Ag₂₀at H-Si(111) surface: Real-time TDDFT simulation in Wannier gauge. H-Si(111)表面 Ag20 等离子衰减产生的热载流子转移：万尼尔规中的实时 TDDFT 模拟。

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/ad8b8e

John Bost, Christopher Shepard, Yosuke Kanai

引用次数: 0

Charge Transfer Induced Phase Transition in Li₂MnO₃at High Pressure. 高压下 Li2MnO3 中电荷转移诱导的相变。

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/ad8b8f

Ajinkya P Khangal, Nishant N Patel, Ajay Kumar Kumar Mishra

{"title":"Charge Transfer Induced Phase Transition in Li2MnO3at High Pressure.","authors":"Ajinkya P Khangal, Nishant N Patel, Ajay Kumar Kumar Mishra","doi":"10.1088/1361-648X/ad8b8f","DOIUrl":"https://doi.org/10.1088/1361-648X/ad8b8f","url":null,"abstract":"Efficient and better energy storage materials are of utmost technological importance to reduce energy dependence on the fossil fuels. Li2MnO3is one such material having potential to meet most of the requirements for energy storage. This material has been synthesized using solid state synthesis route. High pressure structural and vibrational studies on this material have been carried out upto~ 22 and 26 GPa respectively. These investigations show occurrence of a hitherto unknown second order phase transition to a new low symmetry phase whose symmetry is constrained to be monoclinic with space group P21/n at pressure of ~ 2.3 GPa in Li2MnO3. The bulk modulus and its derivative determined by fitting the P-V data with third order Birch-Murnaghan (B-M) equation of state (EOS) are 113.3 ± 13.1 GPa and 4.1 ± 1.2 respectively. Mode Grüneisen parameter calculated for all the Raman modes show positive values which indicates the absence of any soft mode in this material. A microscopic mechanism based on bond-charge transfer is invoked and applied to understand the spectroscopic changes occurring in this material which also manifests second order structural phase transition. Enhancement in covalent character of Li-O bonds in the Li-O polyhedra is inferred based on the spectroscopic observation and above mechanism.&#xD.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142502583","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":null,"pages":null},"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

Vanadium incorporation in 2D-layered MoSe2. 二维层 MoSe2 中的钒掺入。

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/ad8abb

João Vitor Bastos Del Piero, Roberto Hiroki Miwa, Wanderla Luis Scopel

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