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

Exploring quadratic nodal point and square nodal line in two dimensional binary C4X2 compounds (X = N, P, As) 二维二元C4X2化合物（X = N， P, As）的二次节点和方节点线研究

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-04-22 DOI: 10.1016/j.physe.2025.116279

Guanqi Wang , Jiahang Li , Li Zhou , Peng Wang , Xiaoming Zhang , Hongkuan Yuan , Tie Yang , Tianran Yang

{"title":"Exploring quadratic nodal point and square nodal line in two dimensional binary C4X2 compounds (X = N, P, As)","authors":"Guanqi Wang , Jiahang Li , Li Zhou , Peng Wang , Xiaoming Zhang , Hongkuan Yuan , Tie Yang , Tianran Yang","doi":"10.1016/j.physe.2025.116279","DOIUrl":"10.1016/j.physe.2025.116279","url":null,"abstract":"<div><div>Recently, the investigation of topological states in two dimensional materials has gained prominence, serving as a complementary area to studies of three dimensional systems. This research presents the exceptional topological properties of the monolayer binary compounds C<sub>4</sub>X<sub>2</sub> (X = N, P, As) through theoretical calculations. These compounds are characterized by a simple electronic structure consisting of only two bands near the Fermi energy and their band crossing leads to noteworthy topological features, specifically a quadratic nodal point and a Weyl square nodal line. A comprehensive analysis of the mechanisms underlying band formation and dispersion conditions has been conducted. The edge states associated with these compounds emerge from the nodal point and extend towards the nodal line, exhibiting extensive spatial distribution. The lightweight constituent elements of these materials ensure that both the topological features and edge states maintain stability, even when accounting for spin-orbit coupling effects. To enhance practical applicability, this study has also assessed the strain-dependent behaviors of the topological states alongside the anisotropic mechanical properties of the materials. Collectively, the investigation of these ideal topological states, in conjunction with the stability of the material candidates, lays a robust foundation for future experimental research. This work has the potential to facilitate significant advancements in the rapidly evolving field of two-dimensional topological materials.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116279"},"PeriodicalIF":2.9,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887413","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}

引用次数: 0

Tailoring and enhancing thermal conductivity in germanene nanotubes: A superior alternative to carbon nanotubes using external fields 锗烯纳米管的调整和增强热导率：使用外场的碳纳米管的优越替代品

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-04-22 DOI: 10.1016/j.physe.2025.116278

Somayeh Behzad

引用次数: 0

Nonlinear screening and charge redistribution in periodically doped graphene 周期性掺杂石墨烯的非线性筛选与电荷重分布

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-04-18 DOI: 10.1016/j.physe.2025.116250

K.A. Baryshnikov, A.V. Gert, Yu.B. Vasilyev, A.P. Dmitriev

{"title":"Nonlinear screening and charge redistribution in periodically doped graphene","authors":"K.A. Baryshnikov, A.V. Gert, Yu.B. Vasilyev, A.P. Dmitriev","doi":"10.1016/j.physe.2025.116250","DOIUrl":"10.1016/j.physe.2025.116250","url":null,"abstract":"<div><div>The screening problem for the Coulomb potential of a charge located in a two-dimensional (2D) system has an intriguing solution with a power law distance screening factor due to out-of-plane electrical fields. This is crucially different from a three-dimensional case with exponential screening. The long-range action of electric fields results in the effective inflow of electrons from high-doped regions to low-doped regions of a 2D heterostructure. In graphene and other materials with a linear energy spectrum for electrons, such an inflow in low-doped regions also occurs, but its effectiveness is dependent on the doping level. It can be used to fabricate high-conducting channels. We propose a theory for determining electron potential and concentration in a graphene sheet periodically doped along one dimension, taking into account all effects of long-range 2D screening. This results in a substantially nonlinear integro-differential problem, which is solved numerically via a computationally cheap algorithm. Similar nonlinear problems arise in a wide range of doped 2D heterostructures made of linear spectrum materials.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116250"},"PeriodicalIF":2.9,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874548","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}

引用次数: 0

Role of edge reconfiguration in generating corner states in Zigzag graphene nanoribbons 边缘重构在之字形石墨烯纳米带产生角态中的作用

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-04-18 DOI: 10.1016/j.physe.2025.116260

Wenxuan Jiang , Zheng-Fang Liu , Qing-Ping Wu , Xianbo Xiao

{"title":"Role of edge reconfiguration in generating corner states in Zigzag graphene nanoribbons","authors":"Wenxuan Jiang , Zheng-Fang Liu , Qing-Ping Wu , Xianbo Xiao","doi":"10.1016/j.physe.2025.116260","DOIUrl":"10.1016/j.physe.2025.116260","url":null,"abstract":"<div><div>The study investigates the significance of edge architecture in graphene nanoribbons and its implications on electronic properties and transport behavior. Particularly, it explores the effects of edge reconstruction on Zigzag graphene nanoribbons, focusing on the impact of (5, 7) edge remodeling caused by Stone–Wales defects on topological features and edge states. The energy band structure and state distribution of the reconfigured Zigzag (5, 7) graphene nanoribbon were examined using the tight-binding model. The findings indicate that the edge reconstruction creates energy gaps in the edge-state bands, resulting in the appearance of corner states at the vertices of rectangular graphene nanoflakes with reconstructed edges. Furthermore, analysis of the boundary atomic structure unveiled an SSH4-like configuration at the edges, forming a topological structure that gives rise to zero-energy corner states and two distinct nonzero-energy corner states. The study also notes a transition of non-zero energy corner states towards zero energy influenced by bulk and edge states, while zero-energy corner states shift towards non-zero energy and some merge with the edge states. Nevertheless, the impact of the staggered potential largely restores the corner states determined by the edge structure. This research underscores the significant implications of Stone–Wales-deficient reconfiguration on the topological properties and edge states of Zigzag graphene nanoribbons, providing a theoretical basis for tailoring electron transport characteristics and guiding the development of advanced optoelectronic devices.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116260"},"PeriodicalIF":2.9,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860486","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}

引用次数: 0

Entanglement negativity in non-Hermitian PT-symmetric models 非厄米pt对称模型中的纠缠负性

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-04-17 DOI: 10.1016/j.physe.2025.116271

L.S. Lima

引用次数: 0

Structural, vibrational, elastic, and electronic properties of MgO cluster-assembled monolayers MgO团簇组装单层膜的结构、振动、弹性和电子特性

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-04-17 DOI: 10.1016/j.physe.2025.116275

Yongliang Yong , Zhiyong Liu , Wentao Guo , Qihua Hou , Zhenlong Lv , Gang Liu , Zhansheng Lu , Xinxin Wang , Xinli Li

{"title":"Structural, vibrational, elastic, and electronic properties of MgO cluster-assembled monolayers","authors":"Yongliang Yong , Zhiyong Liu , Wentao Guo , Qihua Hou , Zhenlong Lv , Gang Liu , Zhansheng Lu , Xinxin Wang , Xinli Li","doi":"10.1016/j.physe.2025.116275","DOIUrl":"10.1016/j.physe.2025.116275","url":null,"abstract":"<div><div>Atomic-thin two-dimensional (2D) cluster-assembled metal oxide monolayers have been pursued as a rapidly emerging class of 2D materials with unprecedented properties and potential for versatile applications. Using stable Mg<sub>6</sub>O<sub>6</sub> clusters as building blocks, here, we established two new MgO monolayers (namely g-MgO and r-MgO) that completely differ from the known phases, and explored their growth pattern based on cluster assemblies, structural, vibrational, elastic, and electronic properties by exploiting density functional theory (DFT) calculations. Phonon dispersion calculations reveal both monolayers are dynamically stable. The g-MgO and r-MgO monolayers retain structural integrity at 1200 and 1000 K, respectively. Both monolayers have completely different Raman spectra with unique characters, enabling them to be easily identified them in experiments. The calculated in-plane stiffness and Poisson ratio of g-MgO are 75.69 N/m and 0.40, while that of r-MgO are 62.34 (33.87) N/m and 0.97 (0.53), respectively, revealing the isotropic and anisotropic mechanical response for g-MgO and r-MgO monolayers. The g-MgO (r-MgO) monolayer has direct (indirect) semiconducting properties with a wide bandgap of 4.53 (4.64) eV from HSE06 functional and possesses outstandingly high carrier mobilities (all >2.40 × 10<sup>3</sup> cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup>), offering promising potential in advanced electronic and photoelectronic applications.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116275"},"PeriodicalIF":2.9,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143844052","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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Coherent and incoherent phonon transport in graphene/h-BN superlattice: A machine learning potential 石墨烯/h-BN超晶格中相干和非相干声子输运：一种机器学习潜力

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-04-15 DOI: 10.1016/j.physe.2025.116259

Zihan Tan, Shuo Wang, Yuqi Liu, Yang Xiao, Xiaoye Zhou, Shujun Zhou, Xiaoming Xiu, Haikuan Dong

{"title":"Coherent and incoherent phonon transport in graphene/h-BN superlattice: A machine learning potential","authors":"Zihan Tan, Shuo Wang, Yuqi Liu, Yang Xiao, Xiaoye Zhou, Shujun Zhou, Xiaoming Xiu, Haikuan Dong","doi":"10.1016/j.physe.2025.116259","DOIUrl":"10.1016/j.physe.2025.116259","url":null,"abstract":"<div><div>Currently, numerous studies demonstrate two mechanisms of coherent and incoherent phonon transport in superlattices. The graphene/hexagonal boron nitride (h-BN) superlattice has attracted significant attention because of its excellent thermal, electrical, and mechanical properties. In this study, we construct an accurate neuroevolution potential (NEP) model and conduct molecular dynamics (MD) simulations using the GPUMD package to investigate phonon transport behavior in the graphene/h-BN superlattice. We find that with increasing periods, phonons transition from coherent to incoherent transport, with their intersection corresponding to the lowest thermal conductivity. Additionally, we discuss phonon transport under varying temperature conditions. We also explore phonon transport in aperiodic superlattices to further illustrate the impact of structural disorder. This study enhances our understanding of phonon transport in superlattices and has the potential to broaden the application of graphene/h-BN superlattices in thermal management and electronic devices.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116259"},"PeriodicalIF":2.9,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850430","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}

引用次数: 0

Constructing Floquet Hamiltonians with spacetime exchange symmetry 构造具有时空交换对称的Floquet哈密顿量

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-04-11 DOI: 10.1016/j.physe.2025.116256

Wensi Ke, Pei Wang

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Ultra-broadband tunable terahertz chiral metasurface integrated vanadium dioxides for tri-functional application 三功能应用的超宽带可调谐太赫兹手性超表面集成二氧化钒

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-04-11 DOI: 10.1016/j.physe.2025.116270

Junjie Wang , Lingling Yang , Bin Cai , Yongzhi Cheng , Xiangcheng Li

{"title":"Ultra-broadband tunable terahertz chiral metasurface integrated vanadium dioxides for tri-functional application","authors":"Junjie Wang , Lingling Yang , Bin Cai , Yongzhi Cheng , Xiangcheng Li","doi":"10.1016/j.physe.2025.116270","DOIUrl":"10.1016/j.physe.2025.116270","url":null,"abstract":"<div><div>In this paper, an ultra-broadband tunable chiral metasurface (CMS) integrated vanadium dioxides (VO<sub>2</sub>) films is proposed for tri-functional application in terahertz (THz) region. The proposed composite CMS is composed of two twisted sub-wavelength metal gratings adhered on continuous VO<sub>2</sub> films in front and back layers, metal deformed-split-ring resonator (DSRR) structure in a middle layer, which are separated by two dielectric layers. When VO<sub>2</sub> is in insulating state, the designed composite CMS can achieve an ultra-broadband linear polarization conversion (LPC) and asymmetric transmission (AT) effect, exhibiting that the transmission coefficient of cross-polarization and AT coefficient exceed 90 % from 0.25 THz to 1.30 THz, with a relative bandwidth of 135 %. This ultra-broadband LPC and AT effect is primarily due to interlayer interference and cross-coupling effects of EM fields arising from the anisotropic and chiral characteristics of the CMS structure. However, when VO<sub>2</sub> is in metallic state, the composite CMS can significantly reflect the incident THz waves, which promises to be used as a metal mirror reflector for electromagnetic (EM) shielding application. Furthermore, the ultra-broadband LPC efficiency and AT effect of the designed composite CMS can be dynamically modified by altering the conductivity of VO<sub>2</sub>, which is inherently temperature-dependent and passively modulates with environmental temperature shifts. Leveraging the phase transition property of VO<sub>2</sub>, the maximum modulation depth can reach an impressive 99.7 %. While the relative bandwidth for a modulation depth of 90 % extends up to 176 %. The proposed VO<sub>2</sub> integrated CMS design serves as an important reference for practical applications of THz technology.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116270"},"PeriodicalIF":2.9,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825932","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}

引用次数: 0

Acoustoelectric effect in suspended and substrated silicene 悬浮和衬底硅烯中的声电效应

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-04-10 DOI: 10.1016/j.physe.2025.116269

Subhana Nafees , Meenhaz Ansari

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