Physica E-low-dimensional Systems & Nanostructures最新文献

{"title":"The generalized Su–Schrieffer–Heeger double chains with the chiral and spatial inversion symmetries","authors":"Tao Du,&nbsp;Yuexun Li,&nbsp;Helin Lu,&nbsp;Hui Zhang","doi":"10.1016/j.physe.2025.116255","DOIUrl":"10.1016/j.physe.2025.116255","url":null,"abstract":"<div><div>The central object of this article is the generalized Su–Schrieffer–Heeger double chains with long-range couplings between chains and electron hoppings along the chain. The chiral symmetry and spatial inversion symmetry are applied to give the topologically non-trivial band structure and simplify the model respectively. The topological invariant and energy band of this model are given subsequently. Combining the energy band and topological invariant, we investigate the effects of long-range couplings and hoppings in detail and give the complete phase diagrams for these couplings and hoppings. A result that seemingly violates the bulk-edge correspondence is reported in this article.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116255"},"PeriodicalIF":2.9,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817686","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}

{"title":"Tunable mid-infrared sensing based on graphene-metal hybrid structure","authors":"Xiaowei Wang ,&nbsp;Zhihui Chen ,&nbsp;Zhiyuan Wang ,&nbsp;Guang Feng ,&nbsp;Yang Wang ,&nbsp;Shan Li ,&nbsp;Yibiao Yang ,&nbsp;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}

{"title":"Theoretical predicted topological properties of Janus SrInGaTe4","authors":"Yiwen Gao ,&nbsp;Xiaojing Gao ,&nbsp;Xiaobin Niu ,&nbsp;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 SrInGaTe₄ and its parent compound SrGa₂Te₄ 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 SrInGaTe₄ can be modulated using biaxial strain and external electric fields. Under a tensile strain of 6 %, the inverted band gap of SrInGaTe₄ 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>₂) calculations reveal that SrInGaTe₄ 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}

{"title":"Quantum state transfer in ladder systems with cross-correlated disorder","authors":"M.S.S. Junior,&nbsp;G.M.A. Almeida,&nbsp;F.A.B.F. de Moura","doi":"10.1016/j.physe.2025.116249","DOIUrl":"10.1016/j.physe.2025.116249","url":null,"abstract":"<div><div>We explore a disordered ladder system as a potential platform for the transmission of a single qubit. The quantum channel consists of two coupled one-dimensional chains, with homogeneous intra- and interchain hoppings. We introduce diagonal cross-correlated disorder into the ladder by assigning opposite binary distributions across each leg. By adding two sites, one at each end of the ladder, we explore the conditions under which high-fidelity quantum state transfer can occur. A finite-size analysis shows that the cross-correlation is capable of maintaining good transfer fidelities even amid the presence of moderate disorder. Our findings contribute to the design of quasi-1D quantum channels prone to static parameter fluctuations for quantum communication devices.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"171 ","pages":"Article 116249"},"PeriodicalIF":2.9,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143737876","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}

{"title":"Simultaneously achieving multiband coherent and unidirectional perfect absorptions using hybrid resonator metamaterials","authors":"Shanfang Zhang,&nbsp;Rui Yang,&nbsp;Donghao Zhao","doi":"10.1016/j.physe.2025.116247","DOIUrl":"10.1016/j.physe.2025.116247","url":null,"abstract":"<div><div>We present a study on unidirectional perfect absorption and coherent perfect absorption of electromagnetic fields using a periodic three-cavity cascaded Helmholtz resonator coated with a nested ring resonator array in the terahertz spectrum. The transmissive Helmholtz resonator, when illuminated from both sides, achieves coherent perfect absorption at 2.6 THz, 4.85 THz and 5.3 THz, simultaneously serving as the ground for the nested ring resonator array. In contrast, the nested ring resonators act as triple-band unidirectional absorbers at the frequencies of 11.54 THz, 17.91 THz and 24.75 THz, while maintaining transparency at lower frequencies for the Helmholtz resonators. This integrated design of different resonator metamaterials capable of achieving multi-band dual-mode perfect absorptions simultaneously, promising advancements in multifunctional wave-capturing devices.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"171 ","pages":"Article 116247"},"PeriodicalIF":2.9,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143737875","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}

{"title":"Shell-induced modification of plasmon coupling and appearance of fano resonance without symmetry breaking in core/shell heteronanostructures","authors":"Zhaohua Shi,&nbsp;Fengrui Wang,&nbsp;Ting Shao,&nbsp;Qingzhi Li,&nbsp;Xibin Xu","doi":"10.1016/j.physe.2025.116254","DOIUrl":"10.1016/j.physe.2025.116254","url":null,"abstract":"<div><div>Simulations based on the Discrete Dipole Approximation (DDA) method have been conducted to construct theoretical models consisting of gold cores embedded with various materials in multi-nanoshells, aiming to investigate their plasmonic properties. The optical response of core/multi-shell systems to incident waves is significantly enhanced, with nanoshells demonstrated to effectively modulate surface plasmon frequencies. The plasmon frequencies of shells can be adjusted to match the resonance frequency of the core. The presence of shells alters the field distribution of the entire system, resulting in oscillations perpendicular to the incident polarization. The complex field distribution induced by shells supports the possibility of creating dark resonance modes, leading to predominantly dipolar resonance fano-like resonances combined with bright resonance modes. Core/multi-shell systems have been shown to support fano-like resonances without the need to break symmetry. Strong localized optical fields can be achieved at the frequency of Fano resonance. The narrow spectral features and high local fields of Fano resonances enable many applications based on surface plasmon properties. Simulations and studies have also been conducted on Au/Au core/multi-shell systems with cavity support materials. Rich plasmonic properties can be obtained at their interfaces due to the unique electronic properties of different materials. Different plasmonic phenomena have been observed for the same materials with different structures. In this paper, we only use the gold core/shell to carry out the research.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"171 ","pages":"Article 116254"},"PeriodicalIF":2.9,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726236","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}

{"title":"A comparative first-principles study of the electronic and excitonic properties of 2H-CrX2 (X = S, Se, Te) monolayers","authors":"Chao Ma ,&nbsp;Wei-Yin Li ,&nbsp;Xue-Feng Xiao ,&nbsp;Ya-Chao Liu ,&nbsp;Wen Tong Geng ,&nbsp;Vei Wang","doi":"10.1016/j.physe.2025.116237","DOIUrl":"10.1016/j.physe.2025.116237","url":null,"abstract":"<div><div>Recently, Habib et al. [Nanoscale 11, 20123 (2019)] achieved the first successful synthesis of a two-dimensional (2D) CrS₂ monolayer via chemical vapor deposition, paving the way for the exploration of Cr-based layered materials with exceptional properties. Using first-principles calculations combined with a semi-empirical van der Waals dispersion correction, we have investigated the electronic and excitonic properties of CrX₂ (X = S, Se, Te). Our results predict that the 2H phase of CrX₂ is a direct bandgap semiconductor with a gap ranging from 1.5 eV to 0.8 eV. We observe an increase in electron mobility and a decrease in hole mobility as X varies from S to Te, with values on the order of several hundred cm<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>/Vs. This behavior arises from the opposing trends in the deformation potential constants of the valence band compared to those of the conduction band. The exciton binding energy decreases progressively from 0.42 eV in CrS₂ to 0.25 eV in CrTe₂, suggesting a weakening of excitonic effects with the increasing atomic number of the chalcogen element. This trend is associated with increased dielectric screening as X transitions from S to Te. Notably, the relationship between exciton binding energy and bandgap exhibits a linear dependence, described by <span><math><mrow><msub><mrow><mi>E</mi></mrow><mrow><mi>b</mi></mrow></msub><mo>=</mo><mi>α</mi><msub><mrow><mi>E</mi></mrow><mrow><mi>g</mi></mrow></msub><mo>+</mo><mi>β</mi></mrow></math></span>, with <span><math><mrow><mi>α</mi><mo>=</mo><mn>0</mn><mo>.</mo><mn>258</mn></mrow></math></span> and <span><math><mrow><mi>β</mi><mo>=</mo><mn>0</mn><mo>.</mo><mn>033</mn></mrow></math></span>. The strong excitonic effects and tunable electronic properties of 2H-CrX₂ monolayers suggest their potential for a range of optoelectronic applications, including LEDs, photodetectors, and solar cells, while also opening up avenues for optimizing performance in quantum emitters and photovoltaics through substrate engineering or external fields.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"171 ","pages":"Article 116237"},"PeriodicalIF":2.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696690","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}

{"title":"Electronic characteristics of diamanes and diamane-based heterojunctions","authors":"K.S. Grishakov ,&nbsp;V.B. Merinov ,&nbsp;K.P. Katin ,&nbsp;M.M. Maslov","doi":"10.1016/j.physe.2025.116248","DOIUrl":"10.1016/j.physe.2025.116248","url":null,"abstract":"<div><div>In the presented article, the electronic characteristics of various diamanes are calculated from the first principles within the density functional theory, and the band discontinuities in lateral diamane-based heterojunctions are determined. The exchange-correlation functionals PBE and HSE are used. It is shown that lateral heterojunctions formed by carbon and boron-nitride diamanes with a hydrogen surface coating belong to the heterojunctions of the second type. In the case of a lateral boundary between carbon and fluorinated diamanes, a heterojunction of the first type is formed. The possibility of a significant change in the electronic characteristics of quasi-two-dimensional diamanes due to mechanical deformations of tension and compression is demonstrated.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"171 ","pages":"Article 116248"},"PeriodicalIF":2.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696691","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}

{"title":"Thermoelectric response of nanoscale devices in the nonlinear regime","authors":"Raymond J. Hartig ,&nbsp;Ioan Grosu ,&nbsp;Ionel Ţifrea","doi":"10.1016/j.physe.2025.116236","DOIUrl":"10.1016/j.physe.2025.116236","url":null,"abstract":"<div><div>We consider the thermoelectric transport through a two-terminal nanoscale device whose terminals are subject to a temperature (<span><math><mrow><mi>Δ</mi><mi>T</mi><mo>=</mo><msub><mrow><mi>T</mi></mrow><mrow><mi>L</mi></mrow></msub><mo>−</mo><msub><mrow><mi>T</mi></mrow><mrow><mi>R</mi></mrow></msub></mrow></math></span>) and voltage difference (<span><math><mrow><mi>Δ</mi><mi>μ</mi><mo>=</mo><msub><mrow><mi>μ</mi></mrow><mrow><mi>L</mi></mrow></msub><mo>−</mo><msub><mrow><mi>μ</mi></mrow><mrow><mi>R</mi></mrow></msub><mo>;</mo><mi>Δ</mi><mi>μ</mi><mo>=</mo><mo>−</mo><mi>e</mi><mi>Δ</mi><mi>V</mi></mrow></math></span>). We present general expressions for the charge and heat currents that allow us to calculate the power output in the nonlinear regime. The formulae for the charge and heat currents are <em>analytical</em>, and can be expressed using dimensionless kinetic transport coefficients <span><math><mrow><msubsup><mrow><mi>K</mi></mrow><mrow><mi>n</mi></mrow><mrow><mi>p</mi></mrow></msubsup><mrow><mo>(</mo><mi>μ</mi><mo>,</mo><mi>T</mi><mo>)</mo></mrow></mrow></math></span>. As an example, we consider the cases of Breit–Wigner, antiresonance, and Fano line-shape electronic transmission functions. In these cases, the dimensionless kinetic coefficients can be calculated in terms of Hurwitz zeta functions and Bernoulli numbers. Our analysis proves that terms beyond the standard linear approximation have to be considered when one investigates the thermoelectric response of a nanoscale device. These results allow for the optimization of the system’s thermoelectric transport efficiency in the nonlinear regime.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"171 ","pages":"Article 116236"},"PeriodicalIF":2.9,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Applied electric and magnetic field effects on the bandgap formation and antiferromagnetic ordering in AA-stacked Bilayer Graphene","authors":"V. Apinyan,&nbsp;T. Kopeć","doi":"10.1016/j.physe.2025.116235","DOIUrl":"10.1016/j.physe.2025.116235","url":null,"abstract":"<div><div>In this study, we consider a two-layer graphene structure stacked in the AA form and exposed to the influence of two different electric fields applied to different layers. The graphene layers are also subjected to an external magnetic field perpendicular to the planes of the layers. We investigate the possible effects of the applied in-plane fields and the magnetic field on excitonic pairing, antiferromagnetic order, and the chemical potential. Simultaneously, we analyze the effects of the interlayer Coulomb interaction potential on the physical properties of the considered system. We demonstrate that the application of planar electric fields leads to the formation of an unusually large bandgap in the electronic band structure, which is not typical for AA-stacked bilayer graphene. We discuss various values of the applied electric field potentials and show their influence on the electronic band structure of the system. Additionally, we identify the existence of a critical value of the magnetic field above which Wigner crystallization-like effect is present for the electrons, also affecting the excitonic gap in one spin channel. The results obtained in this study could be important for applications of AA-stacked bilayer graphene as a large band-gap material.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"171 ","pages":"Article 116235"},"PeriodicalIF":2.9,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684135","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}