Journal of physics. Condensed matter : an Institute of Physics journal最新文献_第4页

Synergistic regulation of temperature and primary knock-on atom energy on irradiation damage evolution in tantalum: A molecular dynamics study. 温度和初敲原子能量对钽辐照损伤演化的协同调控：分子动力学研究。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-10-13 DOI: 10.1088/1361-648X/aeb3e2

Kai Wang, Junfeng Teng, Lei Zhang, Shuo Wang, Xinfang Jia, Haixia Cheng, Ping Qian

引用次数: 0

An Energy Integration Free Kubo-Bastin Formula Decomposition. 无能量积分的Kubo-Bastin公式分解。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-10-13 DOI: 10.1088/1361-648X/aeb3e3

Ousmane Ly

引用次数: 0

Boundary memory in ultrafast field emission: a two-time quantum statistical theory. 超快场发射中的边界记忆：一个双时间量子统计理论。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-10-12 DOI: 10.1088/1361-648X/aeb343

Benat Gurrutxaga Lerma

{"title":"Boundary memory in ultrafast field emission: a two-time quantum statistical theory.","authors":"Benat Gurrutxaga Lerma","doi":"10.1088/1361-648X/aeb343","DOIUrl":"https://doi.org/10.1088/1361-648X/aeb343","url":null,"abstract":"Ultrafast field emission is usually modelled by evaluating the stationary tunnelling current at the instantaneous driving field. We show that this fails whenever the emitting surface has electronic structure near the Fermi level: the vacuum escape channel reacts back on the occupied boundary spectrum that feeds it, and because that spectrum relaxes on a finite timescale the emitted current carries memory of the field's recent history. Formulating the driven emission problem on the Keldysh contour and propagating the boundary Green functions with a material specific surface spectrum, we find two distinct kinds of memory: a traversal memory that filters and delays the carrier when the driving frequency approaches the tunnelling rate, and a spectral relaxation memory that suppresses and reshapes the current when a pulse drives a thin barrier emitter through the stationary overcoupling turnover. The second can dominate even when the barrier traversal is quasistatic, and predicts a current that falls while the instantaneous transparency still rises. Which memory governs a surface is set by its barrier thickness and its coupling to the vacuum, so the ultrafast waveform distinguishes emitters that the instantaneous theory treats alike.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149169776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Relaxing bulk modulus in water: evidence from computer simulation of instantaneous compression. 水中松弛体模量：来自瞬时压缩计算机模拟的证据。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-10-12 DOI: 10.1088/1361-648X/aea959

Yu D Fomin, V V Brazhkin

引用次数: 0

From methanol to 1-nonanol: chain length effects on dielectric relaxation and dipolar correlations in linear alcohols. 从甲醇到1-壬醇：链长对线性醇的介电弛豫和偶极相关性的影响。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-10-12 DOI: 10.1088/1361-648X/aead3d

Martina Požar

{"title":"From methanol to 1-nonanol: chain length effects on dielectric relaxation and dipolar correlations in linear alcohols.","authors":"Martina Požar","doi":"10.1088/1361-648X/aead3d","DOIUrl":"10.1088/1361-648X/aead3d","url":null,"abstract":"The dielectric properties of a series of alcohols, from methanol to 1-nonanol, were studied using molecular dynamics simulations. Three commonly used force fields, the united atom OPLS and TraPPE and the all atom CHARMM, were employed to calculate the static dielectric constant, Kirkwood correlation factor, collective and single molecule dipole relaxation and the frequency domain dielectric spectra. All three force fields underestimate the static dielectric constant, with CHARMM and OPLS doing so by a near constant factor across the series, and TraPPE showing strong chain length dependence. The collective and single molecule dipole relaxation times grow significantly with the increase in the alkyl chain length, most prominently for CHARMM and more modestly for the two united-atom force fields. A dynamic Kirkwood factor, defined as the ratio of collective to single molecule dipole relaxation times, is introduced to connect the static and dynamic picture. This dynamic Kirkwood factor is shown to be systematically larger than its static counterpart and its growth with chain length in the CHARMM model mirrors the transition of the alkyl tail from a dynamic spectator to a dynamic governor. The results are discussed alongside available experimental data, highlighting the strengths and weaknesses of each force field in modeling the dielectric behavior of linear alcohols.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149077144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Edge states in non-Hermitian photonic Chern insulators: remote excitation with a real-frequency point source. 非厄米光子陈绝缘子的边缘态：实频点源远激。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-10-12 DOI: 10.1088/1361-648X/aea72c

Heming Shen, Yichen Li, Fanyong Liu, Xinyu Zhao, Maoxiong Zhao, Xinhua Hu

引用次数: 0

Channel resolved field emission beyond the work function: a quantum statistical approach. 通道分辨场发射超越功函数：量子统计方法。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-10-12 DOI: 10.1088/1361-648X/aeb342

Benat Gurrutxaga Lerma

{"title":"Channel resolved field emission beyond the work function: a quantum statistical approach.","authors":"Benat Gurrutxaga Lerma","doi":"10.1088/1361-648X/aeb342","DOIUrl":"https://doi.org/10.1088/1361-648X/aeb342","url":null,"abstract":"Cold field emission is almost universally analysed through the Fowler-Nordheim law, in which the metal enters only as a scalar work function and a free electron supply density. We show that the emitted current is instead controlled by the channel resolved overlap between the vacuum escape kernel and the occupied boundary spectral density of the metal, and that this overlap reorders the material rankings the standard theory predicts.Formulating the emission problem on the Keldysh contour and integrating out the vacuum exterior of a conducting wedge yields an exact retarded vacuum self energy, whose boundary reduction expresses the stationary current as a trace pairing between an escape rate carrying the geometry and the barrier, and a boundary spectral density carrying the surface electronic structure. We evaluate this pairing from first principles across 38 surface orientations of 14 metals and compounds. Materials of nearly identical work function differ by up to an order of magnitude in emitted current, the leading emitters being those whose spectral weight lies in the transverse momentum channels that the vacuum selects most strongly. Surface orientation emerges as an important independent design variable, with facet to facet variations of up to a factor of about six that are almost entirely spectral in origin. On thin barrier surfaces the vacuum self energy depletes the boundary spectrum from which emission is drawn, and the channel resolved emission current exhibits a turnover as the field increases. Work function screening alone is an insufficient criterion for selecting field emitters.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149169396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

General formulas for calculating the ballistic conductance of two-dimensional Dirac materials. 二维狄拉克材料弹道电导的一般计算公式。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-10-12 DOI: 10.1088/1361-648X/aeb341

Mehdi Saeidi, Mahdi Esmaeilzadeh

{"title":"General formulas for calculating the ballistic conductance of two-dimensional Dirac materials.","authors":"Mehdi Saeidi, Mahdi Esmaeilzadeh","doi":"10.1088/1361-648X/aeb341","DOIUrl":"https://doi.org/10.1088/1361-648X/aeb341","url":null,"abstract":"One important electrical quantity in devices is the conductance; for systems on the mesoscopic scale and nanoscale, the conductance is given by the Landauer-Buttiker formalism. In this paper, by using the minimal Weyl Hamiltonian, a theoretical study on the ballistic conductance of two-dimensional (2D) Dirac materials is carried out, with the aim of deriving properties of the ballistic conductance. In addition, formulas for calculating and comparing the ballistic conductance of Dirac materials with diverse cones are given. Our study reveals that the ballistic conductance can be both isotropic and anisotropic, depending on the values of the Dirac cone characteristics (i.e., the anisotropy and tilt). The effects of the anisotropy and tilt of the Dirac cone on the ballistic conductance are investigated in detail. For the right Dirac cone, we show that the ballistic conductance in the x direction does not depend on the strength of the anisotropy of Dirac cone, while the ballistic conductance in the y direction varies inversely with the strength of anisotropy. We find that the ballistic conductance of the oblique Dirac cone is greater than that of the right Dirac cone. Also, when the strength of tilt increases, that is, when the Dirac cone becomes more tilted, the ballistic conductance rises. We also investigate symmetry properties of the ballistic conductance. This paper provides a new and deeper insight into properties of the ballistic conductance from massless Dirac fermions and can be useful for designing electronic devices with desired performance.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149168520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experiment-specific memory and relaxation structure in graphene transport: a kernel-first state-trajectory analysis. 石墨烯输运中的实验特异性记忆和弛豫结构：核优先状态轨迹分析。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-10-08 DOI: 10.1088/1361-648X/aeb218

Louis Hin Lok Tsang

{"title":"Experiment-specific memory and relaxation structure in graphene transport: a kernel-first state-trajectory analysis.","authors":"Louis Hin Lok Tsang","doi":"10.1088/1361-648X/aeb218","DOIUrl":"https://doi.org/10.1088/1361-648X/aeb218","url":null,"abstract":"Graphene transport experiments probe relaxation through different observables, timescales and measurement domains, making direct comparison of reported relaxation parameters difficult. Here we develop a kernel-first, provenance-constrained methodology for determining what aspects of relaxation structure can be identified from heterogeneous transport measurements before assigning them a common physical interpretation. The approach distinguishes measured, processed, fitted and theoretically derived quantities, and separates response magnitude, kernel sensitivity and experimentally observed state evolution.The method is applied to three complementary graphene experiments. Frequency-resolved complex conductivity provides identifiable spectral relaxation descriptors and, where an admissible parametrisation is supported, permits explicit kernel-sensitivity and state-trajectory analysis. Ultrafast electronic heat spreading constrains an additional short-time response relative to an independently determined momentum-relaxation interval, but does not identify a unique kernel time. DC electrical and thermal measurements constrain integrated response weights, geometry dependence and a relative relaxation hierarchy without uniquely determining temporal kernel shape. The three experiments therefore occupy different levels of dynamical identifiability rather than providing interchangeable relaxation times.A localized change in an effective-kernel trajectory is not by itself interpreted as a triggered process. The stronger test requires such a change to reproducibly predict an independently measured dynamical response. We propose a same-device, cross-domain experiment implementing this criterion across controlled state trajectories. The principal contribution is a general analysis methodology for determining what relaxation information heterogeneous measurements support and what additional evidence is required before state-dependent response is promoted to a physical mechanism.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149140312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The spin-SHeisenberg antiferromagnet on the Shastry-Sutherland lattice. Shastry-Sutherland晶格上的自旋- sheisenberg反铁磁体。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2026-10-07 DOI: 10.1088/1361-648X/ae8e18

Hiroki Nakano, Yuko Hosokoshi, Toru Sakai

引用次数: 0