Physica E-low-dimensional Systems & Nanostructures最新文献_第9页

The performance of quantum battery in a common dephasing environment 量子电池在普通失相环境下的性能

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-03-11 DOI: 10.1016/j.physe.2025.116229

Weiran Hu , Shuochen Yang , Jiangfeng Tian , Zirong He , Liang Qiu , Fangxin Zhang

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Shape and size effects on electronic thermodynamics in nanoscopic quantum dots 纳米量子点中形状和尺寸对电子热力学的影响

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-03-10 DOI: 10.1016/j.physe.2025.116228

J.A. Gil-Corrales , C.A. Dagua-Conda , M.E. Mora-Ramos , A.L. Morales , C.A. Duque

{"title":"Shape and size effects on electronic thermodynamics in nanoscopic quantum dots","authors":"J.A. Gil-Corrales , C.A. Dagua-Conda , M.E. Mora-Ramos , A.L. Morales , C.A. Duque","doi":"10.1016/j.physe.2025.116228","DOIUrl":"10.1016/j.physe.2025.116228","url":null,"abstract":"<div><div>The thermodynamic properties of strongly confined semiconductor nanostructures are significantly influenced by their geometry because the thermal de Broglie wavelength of the particles is comparable to the size of the structure. GaAs quantum dots (QDs) are nanostructures that can be configured in various geometrical forms, which makes them excellent candidates for studying how geometrical variations affect their thermodynamic properties. In this work, we present the study of the thermodynamic properties of a GaAs QD in spherical, cylindrical, cubic, and pyramidal shapes, through the finite element method (FEM) considering external infinite confinement and the effective mass approximation. The design of QDs guarantees the same volume (V) and cross-sectional area (A) for each case, providing structures with similar size characteristics. We observe stepwise behaviors in the particle number and entropy as a function of chemical potential due to shape dependence for the highest confinement configuration, which agrees with the nature of the Fermi–Dirac distribution function. Finally, we present the effect of geometrical shape for all geometrical configurations of the QD. We compare the thermodynamic properties of each arrangement and investigate the heat capacity response for different temperatures.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"170 ","pages":"Article 116228"},"PeriodicalIF":2.9,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620752","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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Laser-assisted tunneling and Hartman effect in graphene under scalar potential and exchange fields 标量势场和交换场下石墨烯的激光辅助隧穿和哈特曼效应

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-03-10 DOI: 10.1016/j.physe.2025.116227

Rachid El Aitouni , Ahmed Jellal , Pablo Díaz , David Laroze

{"title":"Laser-assisted tunneling and Hartman effect in graphene under scalar potential and exchange fields","authors":"Rachid El Aitouni , Ahmed Jellal , Pablo Díaz , David Laroze","doi":"10.1016/j.physe.2025.116227","DOIUrl":"10.1016/j.physe.2025.116227","url":null,"abstract":"<div><div>We study the tunneling effect of Dirac fermions in a graphene sheet by introducing a potential barrier in a region of width <span><math><mi>D</mi></math></span> exposed to laser field. This sheet is placed on a boron nitride/ferromagnetic substrate such as cobalt or nickel. By using the Floquet theory, we determine the solutions of the energy spectrum. We calculate the transmission and reflection coefficients by applying the boundary conditions along with the transfer matrix method. These coefficients help determine their probabilities by current densities and group delay times by their phases. We numerically show that the laser field plays a crucial role in this structure, as it completely suppresses Klein tunneling compared to the case without laser. Furthermore, in contrast to the Hartman effect, the group delay time becomes dependent on the barrier width with the appearance of additional peaks. This suggests that fermion-field interactions cause additional delays within the barrier and also help to reduce spin coupling. Adding BN layers increases the interval of transmission suppression and completely eliminates coupling after the addition of three BN layers. Total reflection is observed for incident fermions with an angle less than <span><math><mrow><mo>−</mo><mn>1</mn></mrow></math></span> or greater than one.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"170 ","pages":"Article 116227"},"PeriodicalIF":2.9,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610809","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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Existence of Mexican-hat dispersion and symmetry group of a layer 墨西哈色散和层对称群的存在性

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-03-10 DOI: 10.1016/j.physe.2025.116224

Vladimir Damljanović

引用次数: 0

Effect of the position of a hydrogen-like impurity on the generation of the third harmonic in a cylindrical quantum dot 类氢杂质的位置对圆柱形量子点三次谐波产生的影响

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-03-08 DOI: 10.1016/j.physe.2025.116223

A.A. Portacio , D. Madrid , D.A. Rasero

{"title":"Effect of the position of a hydrogen-like impurity on the generation of the third harmonic in a cylindrical quantum dot","authors":"A.A. Portacio , D. Madrid , D.A. Rasero","doi":"10.1016/j.physe.2025.116223","DOIUrl":"10.1016/j.physe.2025.116223","url":null,"abstract":"<div><div>This paper presents a theoretical study of the third-order nonlinear optical susceptibility in a GaAs/Ga<sub>0.6</sub>Al<sub>0.4</sub>As cylindrical quantum dot (CDQ) with a hydrogen-like impurity inside. The variational method was utilized to calculate the energies and wave functions corresponding to the bound states of the impurity, which include the <span><math><mrow><mn>1</mn><mi>s</mi></mrow></math></span>-like, <span><math><mrow><mn>2</mn><msub><mrow><mi>p</mi></mrow><mrow><mo>−</mo></mrow></msub></mrow></math></span>-like, <span><math><mrow><mn>2</mn><msub><mrow><mi>p</mi></mrow><mrow><mo>+</mo></mrow></msub></mrow></math></span>-like, and <span><math><mrow><mn>2</mn><msub><mrow><mi>p</mi></mrow><mrow><mi>z</mi></mrow></msub></mrow></math></span>-like states, with consideration of the impurity’s motion within the cylindrical quantum dot. The findings indicate that the resonant peaks of the optical third harmonic generation (THG) coefficient undergo a red shift as the impurity is displaced from the center of the CDQ towards the potential barrier. This shift can be attributed to a reduction in the average electrostatic interaction between the impurity and the surrounding ion as the impurity approaches the potential barrier. This phenomenon can be attributed to the decreased electrostatic attraction between the impurity and the quantum dot core as the impurity moves away from the center and approaches the region of higher potential confinement. These findings have significant implications for the design and optimization of quantum dot-based optoelectronic devices, as manipulation of the impurity position can provide additional control over the nonlinear optical properties of these systems.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"170 ","pages":"Article 116223"},"PeriodicalIF":2.9,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593302","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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Porous graphitic carbon nitride with sodium doped and N vacancies for synergistically enhancing the performance of RhB photodegradation 多孔石墨氮化碳与钠掺杂和N空位协同提高RhB光降解性能

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-03-06 DOI: 10.1016/j.physe.2025.116233

Nuo Xu , Dawei Liu , Juan Xu , Changshun Wang , Tingcha Wei , Caixia Kan

{"title":"Porous graphitic carbon nitride with sodium doped and N vacancies for synergistically enhancing the performance of RhB photodegradation","authors":"Nuo Xu , Dawei Liu , Juan Xu , Changshun Wang , Tingcha Wei , Caixia Kan","doi":"10.1016/j.physe.2025.116233","DOIUrl":"10.1016/j.physe.2025.116233","url":null,"abstract":"<div><div>Graphite carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) stands out as a highly promising visible-light-driven photocatalyst, yet it grapples with the challenge of boosting its photocatalytic performance by increasing specific surface area, inhibiting charge recombination, and stimulating light absorption. Herein, we successfully synthesized a porous g-C<sub>3</sub>N<sub>4</sub> combining sodium doped and N vacancies to synergistically enhance the photocatalytic performance through a simple secondary thermal polymerization method. The experimental results indicate that the existing porous structure elevates the specific surface area of g-C<sub>3</sub>N<sub>4</sub> to 17.52 m<sup>2</sup> g<sup>−1</sup>. Concurrently, benefiting from the narrower band gap and the more efficient charge separation derived from the synergistic modulation of sodium doped and N vacancies, Na-P-g-C<sub>3</sub>N<sub>4</sub> exhibits 5-fold enhanced catalytic efficiency of Rhodamine B photodegradation compared with the undoped g-C<sub>3</sub>N<sub>4</sub>. This work deepens our insights into optimizing g-C<sub>3</sub>N<sub>4</sub> for highly effective photocatalytic materials through synergistic modulation of sodium doped and N vacancies.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"170 ","pages":"Article 116233"},"PeriodicalIF":2.9,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577348","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

4d and 5d transition-metal doped Janus PtSSe as a viable sensitive sensor toward COCl2 掺杂 4d 和 5d 过渡金属的 Janus PtSSe 可作为 COCl2 的灵敏传感器

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-03-06 DOI: 10.1016/j.physe.2025.116234

Jiawei Shen , Qingxiao Zhou , Xinglong Yan , Weiran Li , Weiwei Ju , Chengyou Cai

{"title":"4d and 5d transition-metal doped Janus PtSSe as a viable sensitive sensor toward COCl2","authors":"Jiawei Shen , Qingxiao Zhou , Xinglong Yan , Weiran Li , Weiwei Ju , Chengyou Cai","doi":"10.1016/j.physe.2025.116234","DOIUrl":"10.1016/j.physe.2025.116234","url":null,"abstract":"<div><div>The adsorption behaviors, electronic and gas-sensing properties of phosgene (COCl<sub>2</sub>) on perfect, defected (S- and Se-vacancy), and transition-metal doped (TMs: Pd, Hf, Ta, W, Re, Os, Ir, and Au) PtSSe monolayer were explored by density functional theory (DFT). Pristine PtSSe monolayer exhibited long adsorption distance, small adsorption energy and low charge transfer for phosgene with physical adsorption. Constructing S- and Se-vacancy enhanced the PtSSe's sensitivity to phosgene, while it remained as physical adsorption nature. Furthermore, the adsorption stability of PtSSe toward COCl<sub>2</sub> was further improved after the introduction of Pd, Hf, Ta, W, Re, Ir dopants. The large adsorption energies and high charge transfer suggested that the adsorption mechanism of COCl<sub>2</sub> was converted to chemical adsorption. Moreover, the large gas response and suitable recovery time indicated the Re-doped Janus PtSSe monolayer could be reusable gas sensors for COCl<sub>2</sub> detection with high sensitivity at room temperature. These results offer insights into the design of gas sensors capable of detecting the highly toxic COCl<sub>2</sub> gas.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"170 ","pages":"Article 116234"},"PeriodicalIF":2.9,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577349","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

Optical absorption and refractive index change of neutral donors in InAs/GaAs camel-like nanostructures: 3D finite element analysis 中性给体在InAs/GaAs骆驼状纳米结构中的光吸收和折射率变化：三维有限元分析

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-03-04 DOI: 10.1016/j.physe.2025.116222

R.A. López-Doria , N. Hernández , M.R. Fulla

{"title":"Optical absorption and refractive index change of neutral donors in InAs/GaAs camel-like nanostructures: 3D finite element analysis","authors":"R.A. López-Doria , N. Hernández , M.R. Fulla","doi":"10.1016/j.physe.2025.116222","DOIUrl":"10.1016/j.physe.2025.116222","url":null,"abstract":"<div><div>Spectral and optical properties of neutral donors confined in experimentally grown InAs/GaAs camel-like nanostructures were investigated using the spatial finite element method within the effective mass approximation. The total absorption and refractive index changes were determined by using the compact matrix density formalism. The energy spectrum was found to strongly depend on the donor’s position, with transition energies between the first three low-lying levels below 20 meV (THz band) and further tuneable by applying a static electric field along the “humps”. On-center donor, on-hump donor, and nearly single-electron systems were found to be optically active even at zero electric field. Their optical properties can also be enhanced at specific electric field strengths, a phenomenon linked to the formation of significant dipole moment values and confirmed through volumetric probability density analyses. Additionally, all the systems exhibited a periodic absorption profile with the polarization angle, resembling a “nanoscopic polarizer”.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"170 ","pages":"Article 116222"},"PeriodicalIF":2.9,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562023","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}

引用次数: 0

Middle polariton and Schrödinger's cat induced by exciton-photon-phonon coupling system 激子-光子-声子耦合系统诱导的中极化子和Schrödinger的cat

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-03-01 DOI: 10.1016/j.physe.2025.116226

Xuebing Gong, Hai Zhu

引用次数: 0

Flexible modulation of topological resonator based on different domain walls based on graphene plasmonic valley photonic crystals 基于石墨烯等离子体谷光子晶体的不同畴壁拓扑谐振腔柔性调制

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-27 DOI: 10.1016/j.physe.2025.116225

Lei Xu , Shiqi Qiu , Bangyu Li , Shengqun Guo , Ruimin Huang , Weibin Qiu

{"title":"Flexible modulation of topological resonator based on different domain walls based on graphene plasmonic valley photonic crystals","authors":"Lei Xu , Shiqi Qiu , Bangyu Li , Shengqun Guo , Ruimin Huang , Weibin Qiu","doi":"10.1016/j.physe.2025.116225","DOIUrl":"10.1016/j.physe.2025.116225","url":null,"abstract":"<div><div>Topological edge states (ES) emerge at the interfaces between photonic crystals with distinct topological properties, enabling the suppression of backscattering for unidirectional transmission and exhibiting robustness against defects and disorders. In this work, we propose a flexible modulation strategy for the ES within resonators based on graphene plasmonic valley photonic crystals (VPhCs). Specifically, we initially construct four types of rhombic resonators composed by domain walls using topological valley edge states (VES), achieving localized ES optical fields at various domain walls. Subsequently, four categories of domain walls are heterogeneously integrated to form a single hexagonal resonator. The electromagnetic field distribution in the resonators is dynamically modulated by the variation of the frequency. Our results might provide opportunities for the flexible modulation of ES in graphene plasmonic VPhC resonators, offering prospects for applications in topological plasmonic lasers and high-density micro-nano photonic integration.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"170 ","pages":"Article 116225"},"PeriodicalIF":2.9,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552877","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