Physica E-low-dimensional Systems & Nanostructures最新文献_第7页

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}

引用次数: 0

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

引用次数: 0

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

引用次数: 0

The generalized Su–Schrieffer–Heeger double chains with the chiral and spatial inversion symmetries 具有手性和空间反演对称性的广义Su-Schrieffer-Heeger双链

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.2025.116255

Tao Du, Yuexun Li, Helin Lu, Hui Zhang

引用次数: 0

Tunable mid-infrared sensing based on graphene-metal hybrid structure 基于石墨烯-金属杂化结构的可调谐中红外传感

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-04-08 DOI: 10.1016/j.physe.2025.116268

Xiaowei Wang , Zhihui Chen , Zhiyuan Wang , Guang Feng , Yang Wang , Shan Li , Yibiao Yang , Yuying Hao

{"title":"Tunable mid-infrared sensing based on graphene-metal hybrid structure","authors":"Xiaowei Wang , Zhihui Chen , Zhiyuan Wang , Guang Feng , Yang Wang , Shan Li , Yibiao Yang , Yuying Hao","doi":"10.1016/j.physe.2025.116268","DOIUrl":"10.1016/j.physe.2025.116268","url":null,"abstract":"<div><div>Improving the emission efficiency of molecules or quantum dots is one of the effective means to improve the sensitivity of sensing. Here we provide a graphene-metal hybrid structure to achieve sensitivity detection in mid-infrared. The graphene-metal hybrid structure well coupling with a dipole source in mid-infrared was constructed. And then the high quality resonance peak can be detected. For different molecular detection applications, the resonance window can be controlled by geometrical parameters of metal structure in the mid-infrared range. Meanwhile the resonance wavelengths can be adjusted with graphene's chemical potential and the chemical potential of graphene can be controlled through a varying gate voltage, and the emission enhancement ratio was 105 times on average. The hybrid structures also show excellent results in different background refractive indices. The sensitivity of the hybrid structure as a refractive index sensor reaches 5367 nm/RIU. All of our analyses show that the hybrid structure can be used as a better mid-infrared sensor.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116268"},"PeriodicalIF":2.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820685","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

Theoretical predicted topological properties of Janus SrInGaTe4 理论预测Janus SrInGaTe4的拓扑性质

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-04-04 DOI: 10.1016/j.physe.2025.116257

Yiwen Gao , Xiaojing Gao , Xiaobin Niu , Jianwei Wang

{"title":"Theoretical predicted topological properties of Janus SrInGaTe4","authors":"Yiwen Gao , Xiaojing Gao , Xiaobin Niu , Jianwei Wang","doi":"10.1016/j.physe.2025.116257","DOIUrl":"10.1016/j.physe.2025.116257","url":null,"abstract":"<div><div>Two-dimensional (2D) Janus structures have emerged as promising materials due to their novel physical properties and wide-ranging potential applications. The symmetry breaking inherent in Janus structures raises an intriguing question: do their topological properties persist despite this asymmetry? Both theoretically predicted Janus SrInGaTe<sub>4</sub> and its parent compound SrGa<sub>2</sub>Te<sub>4</sub> retain their topological characteristics when spin-orbit coupling (SOC) is considered. Furthermore, Rashba-type spin splitting is observed at both the conduction band minimum (CBM) and the valence band maximum (VBM), attributed to the inversion asymmetry. The electronic properties of SrInGaTe<sub>4</sub> can be modulated using biaxial strain and external electric fields. Under a tensile strain of 6 %, the inverted band gap of SrInGaTe<sub>4</sub> increases significantly from 40 meV (at zero strain) to 124 meV. Similarly, an applied vertical electric field of 0.2V/Å enlarges the inverted band gap to 84 meV. Topological invariants (<em>Z</em><sub>2</sub>) calculations reveal that SrInGaTe<sub>4</sub> transitions to a normal insulator under a compressive strain of −2 %. Additionally, an applied electric field induces a topological phase transition from non-trivial to trivial, with a critical field of approximately −0.2V/Å. This study demonstrates that both strain and electric fields can effectively tune the topological properties of select 2D materials. These findings provide valuable insights for the design and development of advanced spintronic devices.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116257"},"PeriodicalIF":2.9,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807853","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