Physica B-condensed Matter最新文献

{"title":"The electronic and optical properties of graphene nanoribbons under the influence of the periodic strain","authors":"Chunwen Zhang ,&nbsp;W.X. Yan","doi":"10.1016/j.physb.2024.416711","DOIUrl":"10.1016/j.physb.2024.416711","url":null,"abstract":"<div><div>The electronic and optical properties of graphene nanoribbons under uniaxial periodic strain have been explored using various nearest-neighbor hopping patterns. It is found that by properly selecting hopping patterns, momentum-resolved gaps within minibands emerge, modifying the energy band structure to exhibit hollowed-out profiles, and enhancing peak intensity in local density of states but reducing peak count. The optical transitions are impacted by altered parity symmetry of wavefunctions, causing changes in optical selection rules. The parity of wavefunctions for strained GNRs has been established through rigorous mathematical proof, whereby the optical selection rule is determined for the strained GNRs. The absorption curves arise from a complex interplay between diminished velocity matrix elements and escalated joint density of states.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416711"},"PeriodicalIF":2.8,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701581","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 low copper content alloy Al(1-x)Cux, x≤0.1: A joint computational and experimental study","authors":"M.A. Frolov ,&nbsp;E.M. Dvoryanova ,&nbsp;A.F. Krutov ,&nbsp;V.E. Pavlova ,&nbsp;A.V. Burchakov ,&nbsp;V.A. Novikov ,&nbsp;O.A. Blatova ,&nbsp;A.V. Sokolov ,&nbsp;A.P. Zentsov ,&nbsp;V. Yu Sorokin ,&nbsp;A.N. Gataullin ,&nbsp;S.S. Petrov ,&nbsp;M.O. Kudryashova ,&nbsp;A.A. Kabanov ,&nbsp;V.A. Blatov","doi":"10.1016/j.physb.2024.416741","DOIUrl":"10.1016/j.physb.2024.416741","url":null,"abstract":"<div><div>Atomistic simulation of Al_1-xCu_x (x ≤ 0.1) alloy is performed and the mechanical properties are calculated within the framework of the density functional theory (DFT) by using of the virtual crystal approximation (VCA). The elastic matrix is calculated within the DFT using the CASTEP code and the dependences of Young's, shear and bulk moduli, Vickers hardness, Poisson's ratio, plasticity coefficient and anisotropy indices on the amount of copper are obtained. Al_0.9Cu_0.1 alloy was synthesized by spark plasma sintering (SPS) method. As a result, the aluminum and intermetallic CuAl₂ phases were identified in the obtained sample by X-ray diffraction patterns. The microstructure (SEM) and Vickers microhardness of the sample were studied. The results of the work compensate for the lack of data for the <em>Al-Cu</em> alloys with a low copper content.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416741"},"PeriodicalIF":2.8,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701480","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":"Crystal field and microscopic spin Hamiltonians approach for V3+ ions in α-ZnAl2S4 single crystals","authors":"F. Mselmi,&nbsp;H. Souissi,&nbsp;Abir Hadded,&nbsp;S. Kammoun,&nbsp;E. Dhahri","doi":"10.1016/j.physb.2024.416739","DOIUrl":"10.1016/j.physb.2024.416739","url":null,"abstract":"<div><div>The optical properties of α-ZnAl₂S₄:V³⁺ single crystals were investigated by S. Angel et al. (Anghel et al., 2011) [1]. The spectra of α-ZnAl₂S₄:V³⁺ reveal electronic transitions between the energy levels of V³⁺ ions located at the octahedral site. A comprehensive theoretical study was performed, examining crystal field, spin-spin and other spin orbit interactions. The calculated energy level schemes significantly correspond with the experimental results of V³⁺ doped α-ZnAl₂S₄ at both low and room temperatures. A novel, consistent interpretation of the radiative properties is proposed, considering the effect of temperature on crystal field parameters. This interpretation supports the potential use of α-ZnAl₂S₄: V³⁺ single crystals, excited at λ_ex = 532 nm, as active media in tunable lasers and amplifiers.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416739"},"PeriodicalIF":2.8,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701478","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":"Analysis of the differences and similarities in electromagnetic forces of different equivalent structures of Bi-2212 circular wire","authors":"Bin Wang ,&nbsp;Wenhai Zhou ,&nbsp;Feng Jiang ,&nbsp;Shijie Shi ,&nbsp;Jiafeng Cao","doi":"10.1016/j.physb.2024.416744","DOIUrl":"10.1016/j.physb.2024.416744","url":null,"abstract":"<div><div>Bi-2212 high-temperature superconducting circular wire exhibit excellent superconducting and electromagnetic properties, making them the preferred material for the next generation of high-temperature superconducting cables, as they can be wound in multiple layers. However, the high stress generated during the transmission of large current by the cable may damage the equipment, and the current density, magnetic field and stress distribution are different in the constant external field and the alternating external field environment. Therefore, it is critical to study the difference between the electromagnetic field distribution and the stress distribution of the circular wire in different forms of external field. In this paper, we focus on Bi-2212 circular wires and establish three types of two-dimensional finite element models using homogenization methods. We emphasize the electromagnetic field, radial stress, and circumferential stress distribution characteristics under constant magnetic field and alternating magnetic field environments. We analyze the similarities and differences among these three equivalent models under the two different external field conditions. When the background magnetic field remains constant, the electromagnetic field, radial stress, and circumferential stress exhibit a center-symmetric distribution. Under an alternating magnetic field, the electromagnetic field and stress exhibit an upper-lower symmetric distribution, with the amplitude being smaller on the left side than on the right side. When the amplitude of the background magnetic field is the same, the electromagnetic field and stress have larger amplitudes under an alternating magnetic field. When the alternating field frequency is large, the current penetration depth in the superconducting region decreases, and a part of the current is driven to Ag and Ag-Mg alloys. The Filament-matrix Homogenized Model accurately reflects the distribution patterns of the electromagnetic field and stress. Under an alternating magnetic field, the Bundle-matrix Homogenized Model has a smaller error in stress amplitude compared to the original structure.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416744"},"PeriodicalIF":2.8,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701579","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":"Low threshold quantum correlations via synthetic magnetism in Brillouin optomechanical system","authors":"D.R.K. Massembele ,&nbsp;P. Djorwé ,&nbsp;K.B. Emale ,&nbsp;Jia-Xin Peng ,&nbsp;A.-H. Abdel-Aty ,&nbsp;K.S. Nisar","doi":"10.1016/j.physb.2024.416689","DOIUrl":"10.1016/j.physb.2024.416689","url":null,"abstract":"<div><div>We propose a scheme to generate low driving threshold quantum correlations in Brillouin optomechanical system based on synthetic magnetism. Our proposal consists of a mechanical (acoustic) resonator coupled to two optical modes through the standard optomechanical radiation pressure (an electrostrictive force). The electrostrictive force that couples the acoustic mode to the optical ones striggers Backward Stimulated Brillouin Scattering (BSBS) process in the system. Moreover, the mechanical and acoustic resonators are mechanically coupled through the coupling rate <span><math><msub><mrow><mi>J</mi></mrow><mrow><mi>m</mi></mrow></msub></math></span>, which is <span><math><mi>θ</mi></math></span>-phase modulated. Without a mechanical coupling, the generated quantum correlations, i.e., between optical and mechanical modes, require strong optomechanical and acoustic couplings. By accounting phonon hopping coupling, the synthetic magnetism is induced and the quantum correlations are generated for low coupling strengths. The generated quantum correlations display sudden death and revival phenomena, and are robust against thermal noise. Our results suggest a way for low threshold quantum correlations generation, and are useful for quantum communications, quantum sensors, and quantum computational tasks.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416689"},"PeriodicalIF":2.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661740","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":"Two-strand ladder network variants: Localization, multifractality, and quantum dynamics under an Aubry-André-Harper kind of quasiperiodicity","authors":"Sougata Biswas","doi":"10.1016/j.physb.2024.416705","DOIUrl":"10.1016/j.physb.2024.416705","url":null,"abstract":"<div><div>In this paper we demonstrate, using a couple of variants of a two-strand ladder network that, a quasiperiodic Aubry-André-Harper (AAH) modulation applied to the vertical strands, mimicking a deterministic distortion in the network, can give rise to certain exotic features in the electronic spectrum of such systems. While, for the simplest ladder network all the eigenstates become localized as the modulation strength crosses a threshold, for the second variant, modeling an ultrathin graphene nano-ribbon, the central part of the energy spectrum remains populated by extended wavefunctions. The multifractal character in the energy spectrum is observed for both these networks close to the critical values of the modulation. We substantiate our findings also by studying the quantum dynamics of a wave packet on such decorated lattices. Interestingly, while the mean square displacement (MSD) changes in the usual manner in a pure two-strand ladder network as the modulation strength varies, for the ultrathin graphene nanoribbon the temporal behavior of the MSD remains unaltered only up to a strong modulation strength. This, we argue, is due to the extendedness of the wavefunction at the central part of the energy spectrum. Other measurements like the return probability, temporal autocorrelation function, the time dependence of the inverse participation ratio, and the information entropy are calculated for both networks with different modulation strengths and corroborate our analytical findings.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416705"},"PeriodicalIF":2.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701582","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":"Simultaneous enhancement of visible light absorption and energy storage performances of W5+ implanted WO3-x thin film electrodes","authors":"Lukman O. Animasahun ,&nbsp;Saheed A. Adewinbi ,&nbsp;Bidini A. Taleatu ,&nbsp;Abdulmajeed Abdullah Alayyaf ,&nbsp;Haekyonug Kim ,&nbsp;Adeniyi Y. Fasasi","doi":"10.1016/j.physb.2024.416737","DOIUrl":"10.1016/j.physb.2024.416737","url":null,"abstract":"<div><div>Herein, we report the implantation of oxygen vacancy dopants in electro-coated WO₃ thin film electrodes for enhanced energy and environmental applications. The implantation method involved partial de-oxidation in sodium borohydride to introduce oxygen vacancies into the WO₃ electrodes. The doped WO_3-x demonstrated a significantly lowered average band energy of 2.11 eV, indicating its ability to absorb over 75 % of the visible light spectrum. Moreover, a thin film asymmetric supercapacitor assembled with WO_3-x negatrode demonstrated an improved areal capacitance of 1.15 mFcm⁻² and energy density of 0.33 μWhcm⁻² while consuming power at 17.50 μWcm⁻² when cycled at 25 μAcm⁻². Our solution-processed technique allows for controllable vacancy implantation and binder-free coating of WO_3-x on various substrates. It significantly reduces the processing time and requires low energy consumption, making it a practical and efficient method for enhancing the overall photo-conversion and energy storage performances of WO₃-based electrodes.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416737"},"PeriodicalIF":2.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701584","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":"Orientation dependent thermal behavior of CVD grown few layer MoS2 films","authors":"Ankita Singh,&nbsp;Ashish Kumar Mishra","doi":"10.1016/j.physb.2024.416738","DOIUrl":"10.1016/j.physb.2024.416738","url":null,"abstract":"<div><div>Differently oriented supported MoS₂ nanostructures are ideal candidates for various electronic and optoelectronic applications, with their performance influenced by thermal properties and is still not comprehensively studied. In this paper, we study the temperature-dependent Raman response of CVD synthesized horizontally (H-MoS₂) and vertically (V-MoS₂) oriented MoS₂ grown over SiO₂-Si substrate from 80 to 333 K. The V-MoS₂ shows a relatively higher peak shift, attributed to its smaller contact area with the substrate, giving it a suspended-like characteristic. Then to facilitate quantitative understanding of the non-linear temperature dependency in differently oriented MoS₂ films, a physical model incorporating both volume and thermal effect is employed. The greater four-phonon contribution for in-plane mode of H-MoS₂ compared to V-MoS₂ may be attributed to the larger contact area with the substrate, leading to higher-order scattering due to interface formation. Our study can be leveraged for understanding thermal response in future applications of low-power thermoelectric and optoelectronic devices.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416738"},"PeriodicalIF":2.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661741","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":"Unveiling unsaturated modes from multi-frequency ferromagnetic resonance using maghemite nanoparticles","authors":"M.S. Pessoa ,&nbsp;M.A. Sousa ,&nbsp;P.S. Moscon ,&nbsp;J.R.C. Proveti ,&nbsp;L.C. Merino ,&nbsp;P.C. Morais ,&nbsp;F. Pelegrini ,&nbsp;M. Parise ,&nbsp;L.C. Figueiredo ,&nbsp;E. Baggio-Saitovitch","doi":"10.1016/j.physb.2024.416736","DOIUrl":"10.1016/j.physb.2024.416736","url":null,"abstract":"<div><div>This study reports on the use of ferromagnetic resonance (FMR), at various microwave frequencies (1.1 GHz, 3.5 GHz, 9.4 GHz, and 33.9 GHz), to investigate nanosized maghemite-based (γ-Fe₂O₃) samples in both powder (P) and aqueous-based magnetic fluid (MF) presentations. The structure of the as-synthesized sample was confirmed through x-ray diffraction (XRD), revealing the maghemite phase with average diameter of about 12 nm. Analyses of the room temperature (RT) FMR spectra suggest that the samples are in a non-saturated state for microwave frequencies below about 10 GHz (X-band). Comparisons between theoretical modelling (acceptable) parameters and those obtained through fittings of the experimental data revealed significant discrepancies, highlighting an increase in divergence as the measurement condition deviates from the magnetic saturation condition, taking place at microwave frequencies below about 10 GHz.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416736"},"PeriodicalIF":2.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661743","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":"The role of synthesizing time on the optoelectronic properties of TiO2-ZnO nanocomposite on PTFE substrate fabricated by the chemical bath deposition method","authors":"Youssif S.M. Elzawiei ,&nbsp;Md Roslan Hashim ,&nbsp;Abdullah Abdulhameed ,&nbsp;Mohd Mahadi Halim","doi":"10.1016/j.physb.2024.416734","DOIUrl":"10.1016/j.physb.2024.416734","url":null,"abstract":"<div><div>ZnO-based ultraviolet photodetectors have been employed in advanced applications, including environmental monitoring, space exploration, and secured optical communication. In this work, TiO₂-ZnO nanocomposite that included Ti-doped ZnO nanorods was synthesized using chemical bath deposition method at 96 °C on PTFE substrates for ultraviolet photodetectors. ZnO nanorods grew for 3 h, followed immediately by the synthesis of TiO₂ for 2 h. The characterizations revealed several distinguished structural, optical, and electrical properties compared with reference ZnO-only samples deposited for 3 h and 5 h respectively. The indirect band gap of the produced nanocomposite was 3.09 eV. The fabricated ultraviolet photodetector revealed outstanding results: a responsivity of 673.667 mA/W, a detectivity of 5.121 × 10⁸ Jones, and an external quantum efficiency of 229.44 %. The results showed the potential of the nanocomposite for photodetector applications on flexible substrate.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416734"},"PeriodicalIF":2.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701580","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}