Journal of Physics: Condensed Matter最新文献_第10页

Osmotically-induced rupture of viral capsids.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-27 DOI: 10.1088/1361-648X/adb46f

Felipe Aguiar, Thiago Colla

{"title":"Osmotically-induced rupture of viral capsids.","authors":"Felipe Aguiar, Thiago Colla","doi":"10.1088/1361-648X/adb46f","DOIUrl":"10.1088/1361-648X/adb46f","url":null,"abstract":"A simple model is proposed aimed to investigate how the amount of dissociated ions influences the mechanical stability of viral capsids. After an osmotic and mechanical equilibrium is established with the outer solution, a non-adiabatic change in salt concentration at the external environment is considered, which results in a significant solvent inflow across the capsid surface, eventually leading to its rupture. The key assumption behind such an osmotic shock mechanism is that solvent flow takes place at timescales much shorter than the ones typical of ionic diffusion. In order to theoretically describe this effect, we herein propose a thermodynamic model based on the traditional Flory theory. The proposed approach is further combined with a continuum Hookian elastic model of surface stretching and pore-opening along the lines of a classical nucleation theory, allowing us to establish the conditions under which capsid mechanical instability takes place. Despite its non-local character, the proposed model is able to capture most of the relevant physical mechanisms controlling capsid stability, namely the volume exclusion and entropy of mixing effects among the densely-packed components, the elastic cost for capsid stretching and further pore opening, the Donnan equilibrium across the interface, as well as the large entropy loss resulting from folding the viral genome into close-packed configurations inside the capsid. It is shown that, depending on the particular combination of initial condition and capsid surface strength, the capsid can either become unstable after removal of a prescribed amount of external salt, or be fully stable against osmotic shock, regardless of the amount of ionic dilution.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143391205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Spin-orbit torque in a three-fold-symmetric bilayer and its effect on magnetization dynamics.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-27 DOI: 10.1088/1361-648X/adb192

Wuzhang Fang, Edward Schwartz, Alexey A Kovalev, K D Belashchenko

{"title":"Spin-orbit torque in a three-fold-symmetric bilayer and its effect on magnetization dynamics.","authors":"Wuzhang Fang, Edward Schwartz, Alexey A Kovalev, K D Belashchenko","doi":"10.1088/1361-648X/adb192","DOIUrl":"10.1088/1361-648X/adb192","url":null,"abstract":"Field-free switching of perpendicular magnetization has previously been observed in an epitaxial L11-ordered CoPt/CuPt bilayer and attributed to spin-orbit torque (SOT) arising from the crystallographic 3mpoint group of the interface. Using a first-principles nonequilibrium Green's function formalism combined with the Anderson disorder model, we calculate the angular dependence of the SOT in a CoPt/CuPt bilayer and find that the magnitude of the 3mSOT is about 20% of the conventional dampinglike SOT. We further study the magnetization dynamics in perpendicularly magnetized films in the presence of 3mSOT and Dzyaloshinskii-Moriya interaction, using the equations of motion for domain wall dynamics and micromagnetic simulations. For systems where strong interfacial DMI results in the Néel character of domain walls, we find that a very large current density is required to achieve deterministic switching, because reorientation of the magnetization inside the domain wall is necessary to induce the switching asymmetry. For thicker films with relatively weak interfacial DMI and the Bloch character of domain walls, deterministic switching is possible at much smaller current densities, which may explain the recent experimental findings.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143123099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Extended Haldane model- a modern gateway to topological insulators.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-27 DOI: 10.1088/1361-648X/adb6e9

Tanay Nag, Saptarshi Mandal

引用次数: 0

On the shape of Gaussian scale-free polymer networks.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-26 DOI: 10.1088/1361-648X/adb4b6

Viktoria Blavatska, Yurij Holovatch

引用次数: 0

Investigation of MoTe nanowires in honeycomb and kagome lattices: Dirac cones and flat bands. 研究蜂巢和鹿角晶格中的碲镉钼纳米线：狄拉克锥和扁平带

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-25 DOI: 10.1088/1361-648X/adb5e6

Túlio V de Oliveira, Guilherme A S Ribeiro, Mario S C Mazzoni

引用次数: 0

Edge effects in a planar magnet caused by the impact of an electric field.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-25 DOI: 10.1088/1361-648X/adb676

E B Magadeev, R M Vakhitov

引用次数: 0

Inferring traits of hyperuniformity from local structures via persistent homology.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-20 DOI: 10.1088/1361-648X/adb11b

Abel H G Milor, Marco Salvalaglio

{"title":"Inferring traits of hyperuniformity from local structures via persistent homology.","authors":"Abel H G Milor, Marco Salvalaglio","doi":"10.1088/1361-648X/adb11b","DOIUrl":"10.1088/1361-648X/adb11b","url":null,"abstract":"Hyperuniformity refers to the suppression of density fluctuations at large scales. Typical for ordered systems, this property also emerges in several disordered physical and biological systems, where it is particularly relevant to understand mechanisms of pattern formation and to exploit peculiar attributes, e.g. interaction with light and transport phenomena. While hyperuniformity is a global property, ideally defined for infinitely extended systems, several disordered correlated systems have finite size. It has been shown in Salvalaglioet al(2024Phys. Rev. Res.6023107) that global hyperuniform (HU) characteristics systematically correlate with distributions of topological properties representative of local arrangements. In this work, building on this information, we explore and assess the inverse relationship between hyperuniformity and local structures in point patterns as described by persistent homology. Standard machine learning algorithms trained on persistence diagrams are shown to detect hyperuniformity of periodic point patterns with high accuracy. Therefore, we demonstrate that the information on patterns' local structures allows for characterizing whether finite size arrangements are analogous to those realized in HU patterns. Then, addressing more quantitative aspects, we show that parameters defining hyperuniformity globally can be reconstructed by comparing persistence diagrams of targeted patterns with reference ones. We also explore the generation of patterns entailing given topological properties. The results of this study pave the way for advanced analysis of HU patterns including local information, and introduce basic concepts for their inverse design.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143074548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Existence of structural, electronic and magnetic correlations in Sm₂NiMnO₆double perovskite.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-20 DOI: 10.1088/1361-648X/adb2d1

Supriyo Majumder, Malvika Tripathi, D O de Souza, A Sagdeo, L Olivi, M N Singh, S Pal, D M Phase, R J Choudhary

{"title":"Existence of structural, electronic and magnetic correlations in Sm2NiMnO6double perovskite.","authors":"Supriyo Majumder, Malvika Tripathi, D O de Souza, A Sagdeo, L Olivi, M N Singh, S Pal, D M Phase, R J Choudhary","doi":"10.1088/1361-648X/adb2d1","DOIUrl":"10.1088/1361-648X/adb2d1","url":null,"abstract":"Coupling between different interactions allows the control of physical aspects in multifunctional materials by perturbing any degrees of freedom. Here, we aim to probe the correlation among structural, electronic, and magnetic observables in Sm2NiMnO6(SNMO) ferromagnetic insulator double perovskite. Our employed methodology includes thermal evolution of x-ray diffraction, x-ray absorption spectroscopy, and bulk magnetometry. The magnetic ordering in SNMO adopts two transitions, atTC= 160 K due to the ferromagnetic arrangement of Ni-Mn sublattice and atTd= 34 K because of anti-parallel alignment of polarized Sm paramagnetic moments with respect to Ni-Mn network. Signature of Ni/Mn anti-site disorders are evidenced from short-range structure and magnetization analysis. The long-range as well as short-range crystal structure of SNMO undergo changes acrossTCandTd, observed through temperature dependent variation in Ni/Mn-O bonding characters. Hybridization between Ni, Mn 3d, O 2pelectronic states show changes in the vicinity of magnetic transition. The change in crystal environments governs the magnetic response by imposing alteration in metal-ligand orbital overlap. On the other hand, it is observed that application of electric bias causes monotonic reduction in the saturation magnetic moment. By using these experimental methods, we demonstrate how the structural, electronic, and magnetic properties are correlated in SNMO, which makes it a potential platform for technological usage.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143255861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Upper critical fields in high-Tcsuperconductors.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-20 DOI: 10.1088/1361-648X/adb2d2

Wei Wei, Yuling Xiang, Qiang Hou, Yue Sun, Zhixiang Shi

引用次数: 0

Hydrogen adsorption and properties of goldene: a first-principles study.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-20 DOI: 10.1088/1361-648X/adb471

Natalya Sheremetyeva, Vincent Meunier

{"title":"Hydrogen adsorption and properties of goldene: a first-principles study.","authors":"Natalya Sheremetyeva, Vincent Meunier","doi":"10.1088/1361-648X/adb471","DOIUrl":"10.1088/1361-648X/adb471","url":null,"abstract":"Goldene, a single-atom Au monolayer with a hexagonal lattice in the P6/mmm space group, exhibits interesting hyrdrogen absorption properties, as revealed using density functional theory calculations. This study focuses on H-adsorbed goldene at different coverage ratios, and provides insights into the energetic and electronic properties of this system, distinguishing it from the well-studied pristine goldene. Hydrogen adsorption on goldene, while energetically comparable to bulk gold, shows a slight reduction in energetic favorability and introduces specific scanning tunneling microscopy images, reported here for the first time. Raman spectra of H-adsorbed goldene at a 1/9 coverage ratio are also first reported here, along with a vibrational mode analysis, highlighting distinct atomic displacement patterns. Finally, for completeness, previously reported results on the dynamical and mechanical stability of pristine goldene are reported, with a special emphasis on the quadratic flexural mode characteristic of 2D materials. New insights into the thermodynamic properties of goldene compared to bulk gold are also discussed. Although bulk gold remains thermodynamically more stable at all temperatures, the vibrational contributions to the Helmholtz free energy favor goldene above 175 K, narrowing the stability gap with temperature. Overall, this study validates goldene's robustness and expands its potential for experimental and theoretical exploration in the context of hydrogen adsorption and functionalized 2D materials more broadly.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143391203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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