The European Physical Journal B最新文献_第5页

Magnetic states of finite-length Mn chains on Pt(332) surface induced by the Dzyaloshinskii–Moriya interaction Dzyaloshinskii-Moriya相互作用诱导Pt（332）表面有限长度Mn链的磁态

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-08-20 DOI: 10.1140/epjb/s10051-025-01024-y

Sergey V. Kolesnikov, Ekaterina S. Glazova, Alexander M. Saletsky

{"title":"Magnetic states of finite-length Mn chains on Pt(332) surface induced by the Dzyaloshinskii–Moriya interaction","authors":"Sergey V. Kolesnikov, Ekaterina S. Glazova, Alexander M. Saletsky","doi":"10.1140/epjb/s10051-025-01024-y","DOIUrl":"10.1140/epjb/s10051-025-01024-y","url":null,"abstract":"<p>Using the geodesic nudged elastic band method and the harmonic approximation of transition state theory the magnetic properties of finite-length Mn atomic chains on the Pt(332) surface have been investigated. Our study accounted for exchange interaction, magnetic anisotropy energy, Dzyaloshinskii–Moriya interaction (DMI), and long-range dipole–dipole interactions. We found that finite-length Mn chains can exhibit both quasicollinear and helical structures, with the DMI at the chain ends playing a crucial role in stabilizing these configurations. The competition between magnetic anisotropy energy and DMI determines the plane in which the helical structures are oriented. Additionally, dipole–dipole interactions contribute to narrowing the domain wall width and reducing the deviation of magnetic moments at the chain ends from the easy magnetization axis. Our results show that the lifetimes of magnetic states are highly sensitive to temperature and chain length. For certain chain lengths, the lifetimes of four or even six different magnetic states are nearly identical or very close. This result may be interesting for future technical applications.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144869136","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}

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Editorial - EPJ B topical collections: recent advances in complex systems 编辑- EPJ B专题文集：复杂系统的最新进展

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-08-19 DOI: 10.1140/epjb/s10051-025-01011-3

T. Di Matteo, Marcelo A. Moret, Hernane Borges de Barros Pereira, Thiago B. Murari, Tarcísio M. da Rocha Filho, José Fernando F. Mendes

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Quantum correlations of the photon fields in a waveguide quantum electrodynamics 波导量子电动力学中光子场的量子相关

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-08-14 DOI: 10.1140/epjb/s10051-025-01020-2

Ya. S. Greenberg, O. A. Chuikin, A. G. Moiseev, A. A. Shtygashev, O. V. Kibis

{"title":"Quantum correlations of the photon fields in a waveguide quantum electrodynamics","authors":"Ya. S. Greenberg, O. A. Chuikin, A. G. Moiseev, A. A. Shtygashev, O. V. Kibis","doi":"10.1140/epjb/s10051-025-01020-2","DOIUrl":"10.1140/epjb/s10051-025-01020-2","url":null,"abstract":"<div><p>We present a time-dependent quantum calculations of the first-order and second-order photon correlation functions for the scattering of a single-photon pulse on a two-level atom (qubit) embedded in a one-dimensional open waveguide. Within Markov approximation we find the analytic expression for the quantum operator of positive frequency electric field. We restricted Hilbert space of initial states by the states with one and two excitations and show that the photon probability amplitudes are given by the off-diagonal matrix elements of the electric field operator between these states. For two-excitation initial state where the atom is excited and there exists a single photon in a waveguide we calculate the second-order correlation function which describes the measurements by two detectors at two different space-time points. The second-order correlation function exhibits the interference term showing that the measurements of two detectors are correlated. This interference is similar to that found in the Hanbury Brown and Twiss correlation experiment with two indistinguishable photons.</p></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144843206","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

Diagnosing chaos in a periodically driven Ising model with a ramping field via out-of-time-order correlation saturation 基于非时序相关饱和的斜坡场周期性驱动Ising模型混沌诊断

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-08-13 DOI: 10.1140/epjb/s10051-025-01021-1

Rohit Kumar Shukla, Gaurav Rudra Malik, S. Aravinda, Sunil Kumar Mishra

{"title":"Diagnosing chaos in a periodically driven Ising model with a ramping field via out-of-time-order correlation saturation","authors":"Rohit Kumar Shukla, Gaurav Rudra Malik, S. Aravinda, Sunil Kumar Mishra","doi":"10.1140/epjb/s10051-025-01021-1","DOIUrl":"10.1140/epjb/s10051-025-01021-1","url":null,"abstract":"<p>The dynamic region of out-of-time-ordered correlators (OTOCs) serves as a powerful indicator of chaos in classical and semiclassical systems, capturing the characteristic exponential growth. However, in spin systems, the dynamic region of OTOCs does not reliably quantify chaos as both integrable and chaotic systems display similar behavior. Instead, we utilize the saturation behavior of OTOCs to differentiate between chaotic and integrable regimes. In integrable systems, the saturation region of OTOCs exhibits oscillatory behavior, while in chaotic systems, it shows a stable saturation. To evaluate this distinction, we investigate a time-dependent Ising spin system subjected to a linearly ramping transverse field, analyzing both integrable (without longitudinal field) and non-integrable (with longitudinal field) scenarios. This setup accelerates system ergodicity due to the introduction of an additional time scale within the system, enhancing chaotic dynamics in the non-integrable regime, and provides a compelling model for studying the interplay between integrability and chaos in quantum systems. To further support our findings, we investigate the level spacing distribution of time-dependent unitary operators, which effectively distinguishes chaotic from regular regions in our system and corroborates the results obtained from the saturation behavior of the OTOC. Additionally, we calculate a metric for the normalized Fourier spectrum of the OTOC which is dependent on the number of frequency components present to gain insights into the observed oscillations and its dependence on the ramping field.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-025-01021-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144832275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Quantum capacitance in two-dimensional TMDC semiconductors: effects of temperature, electric field, and spin–valley Zeeman field 二维TMDC半导体中的量子电容：温度、电场和自旋谷塞曼场的影响

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-08-12 DOI: 10.1140/epjb/s10051-025-01023-z

Do Muoi, Le Van Tan

{"title":"Quantum capacitance in two-dimensional TMDC semiconductors: effects of temperature, electric field, and spin–valley Zeeman field","authors":"Do Muoi, Le Van Tan","doi":"10.1140/epjb/s10051-025-01023-z","DOIUrl":"10.1140/epjb/s10051-025-01023-z","url":null,"abstract":"<div><p>We investigate the dependence of quantum capacitance <span>(left({C}_{text{Q}}right))</span> on the Fermi energy <span>(left({E}_{text{F}}right))</span> in two-dimensional semiconductor materials belonging to the transition metal dichalcogenide (TMDC) family, taking into account the influences of external electric fields, Zeeman fields, and temperature. At low temperatures, distinct peaks and abrupt steps are clearly observed; whereas, at room temperature, these features are suppressed owing to thermal broadening from the Fermi–Dirac distribution. When external electric fields and Zeeman field components are introduced, the structure of <span>({C}_{text{Q}})</span> becomes more complex, exhibiting step-like features and deep valleys around the Fermi level. These reflect energy level splitting induced by spin–orbit coupling and valley polarization. A comparison among MoS<sub>2</sub>, MoSe<sub>2</sub>, WS<sub>2</sub>, and WSe<sub>2</sub> reveals significant differences in the band gap width and density of states. These results demonstrate that the quantum capacitance in TMDCs is sensitive to external parameters, highlighting its potential for applications in quantum electronic devices, high-sensitivity sensors, and spintronic technologies based on two-dimensional materials.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144832195","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}

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On the Wiedemann–Franz law violation in graphene and quark–gluon plasma systems 石墨烯和夸克-胶子等离子体系统中Wiedemann-Franz定律的违反

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-08-09 DOI: 10.1140/epjb/s10051-025-01009-x

Ashutosh Dwibedi, Subhalaxmi Nayak, Sathe Subodh Kiran, Sabyasachi Ghosh, Sesha Vempati

{"title":"On the Wiedemann–Franz law violation in graphene and quark–gluon plasma systems","authors":"Ashutosh Dwibedi, Subhalaxmi Nayak, Sathe Subodh Kiran, Sabyasachi Ghosh, Sesha Vempati","doi":"10.1140/epjb/s10051-025-01009-x","DOIUrl":"10.1140/epjb/s10051-025-01009-x","url":null,"abstract":"<p>A comparative study of the thermodynamic and transport properties of the ultra-relativistic quark–gluon plasma produced in heavy ion collisions with the “quasi-relativistic” massless electron–hole plasma in graphene sample have been performed. We observe that the enthalpy per net charge carrier emerges as a useful physical quantity determining the transport variables in hydrodynamic domain. Lorenz ratio is defined as thermal to electrical conductivity ratio, normalized by temperature and Lorenz number <span>(L_{0}=frac{pi ^{2}}{3}left( frac{k_{B}}{e}right) ^{2})</span>. The validity of the Wiedemann–Franz law can be checked by evaluating the Lorenz ratio, which is expected to be unity. We investigate the validity of the Wiedemann–Franz law by examining whether the Lorenz ratio equals unity or deviates from it. Our findings indicate that, within the fluid-based framework, the Lorenz ratio consistently leads to a violation of the Wiedemann–Franz law. This is attributed to the proportional relation between Lorenz ratio and enthalpy per net charge carrier in the fluid. Based on the experimental observation, graphene and quark–gluon plasma, both systems at a low net carrier density, violate the Wiedemann–Franz law due to their fluidic nature. However, graphene at a relatively high net carrier density obeys the Wiedemann–Franz law, followed by metals with high Fermi energy or electron density. It indicates a fluid to the non-fluid transition of the graphene system from low to high carrier density. In this regard, the fluid or non-fluid aspect of quark–gluon plasma at high density is yet to be explored by future facilities such as Compressed Baryonic Matter and Nuclotron-based Ion Collider fAcility experiments.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163820","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

First principles calculations of structural, electronic, and optical properties of K3GaF6 structure using density functional theory approach 利用密度泛函理论方法计算K3GaF6结构的结构、电子和光学性质的第一性原理

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-08-09 DOI: 10.1140/epjb/s10051-025-01014-0

Ali Albaghdadi, Ali Bakhshayeshi, Rohollah Taghavimendi, Leili Motevalizadeh

{"title":"First principles calculations of structural, electronic, and optical properties of K3GaF6 structure using density functional theory approach","authors":"Ali Albaghdadi, Ali Bakhshayeshi, Rohollah Taghavimendi, Leili Motevalizadeh","doi":"10.1140/epjb/s10051-025-01014-0","DOIUrl":"10.1140/epjb/s10051-025-01014-0","url":null,"abstract":"<div><p>The structural, electronic, and optical properties of the K<sub>3</sub>GaF<sub>6</sub> compound were investigated using the Wien2k package, based on the density functional theory (DFT) and the full-potential linearized augmented plane-wave (FP-LAPW) method. The atomic positions in the structure were optimized, and the generalized gradient approximation (GGA) was employed for the exchange–correlation functional. The total and partial densities of states (DOS), Van Hove singularities, and the electronic contributions from each atom within specific energy ranges were analyzed in detail. The calculated band structure along the high-symmetry directions in the Brillouin zone reveals a direct bandgap of approximately 5.58 eV, primarily arising from the hybridization of atomic orbitals in the conduction band. In the optical analysis, the static dielectric constant, as well as the real and imaginary parts of the dielectric function, and the reflectivity were computed. K<sub>3</sub>GaF<sub>6</sub> exhibits low reflectivity and high transparency across a wide range of photon energies, making it a promising candidate for optoelectronic and UV-transparent applications.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163821","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

Correction: Utilizing data mining techniques for the design of structural and mechanical properties of ABX3 perovskites 修正：利用数据挖掘技术设计ABX3钙钛矿的结构和力学性能

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-08-08 DOI: 10.1140/epjb/s10051-025-01016-y

Wissem Benaissa, Fatiha Saidi, Khadidja Rahmoun

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Praseodymium-doped zinc oxide nanoparticles: preparation and its manifold applications 镨掺杂氧化锌纳米颗粒的制备及其广泛应用

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-08-07 DOI: 10.1140/epjb/s10051-025-01007-z

L. Bruno Chandrasekar, M. Karunakaran, M. Divya Gnaneswari, S. Jegatheeswaran, Sonaimuthu Mohandoss, Subramanian Palanisamy, P. Shunmuga Sundaram, J. Thirumalai, Samar A. Aldossari

{"title":"Praseodymium-doped zinc oxide nanoparticles: preparation and its manifold applications","authors":"L. Bruno Chandrasekar, M. Karunakaran, M. Divya Gnaneswari, S. Jegatheeswaran, Sonaimuthu Mohandoss, Subramanian Palanisamy, P. Shunmuga Sundaram, J. Thirumalai, Samar A. Aldossari","doi":"10.1140/epjb/s10051-025-01007-z","DOIUrl":"10.1140/epjb/s10051-025-01007-z","url":null,"abstract":"<div><p>The attributes of anticancer efficacy, electrochemical and photocatalytic properties of the chemically prepared praseodymium-doped zinc oxide nanoparticles are herein chronicled. The results of the XRD analysis show the formation of the wurtzite geometry irrespective of the doping concentration of praseodymium. Crystallite size, strain, lattice constants and Young’s modulus are also assessed. The anticancer property of the undoped and Pr-doped ZnO nanoparticles against the human breast cancer cell line was evaluated using the MTT assay. The concentration-dependent decrease in cell proliferation is observed, and 100% cell toxicity is achieved at the concentration of 40 μg/ml, irrespective of doping with the IC50 ranging from 7.9 to 9.9 μg/ml. The doping enhances the specific capacitance of the prepared substance as an electrode material. The photocatalytic properties of the prepared nanoparticles are discussed using methyl orange as the pollutant. At 150 min, the degradation efficiency of the prepared zinc oxide catalyst is 78%, whereas the 5% praseodymium-doped zinc oxide is almost the maximum.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163261","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}

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An investigation of an α-phase Ti–xTc alloy from a mechanical and thermodynamic properties α-相Ti-xTc合金的力学和热力学性能研究

IF 1.7 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-08-07 DOI: 10.1140/epjb/s10051-025-01013-1

W. Bahloul, B. R. Sadouki, O. Arbouche, A. Bentouaf

{"title":"An investigation of an α-phase Ti–xTc alloy from a mechanical and thermodynamic properties","authors":"W. Bahloul, B. R. Sadouki, O. Arbouche, A. Bentouaf","doi":"10.1140/epjb/s10051-025-01013-1","DOIUrl":"10.1140/epjb/s10051-025-01013-1","url":null,"abstract":"<div><p>In this paper, we have carried out a computational investigation of electronic, mechanical, and thermodynamic characteristics of the phase of αTi–<i>x</i>Tc utilizing the density functional theory (DFT) implemented in the quantum espresso code. We applied the exchange and correlation functions in the Perdew–Burke–Ernzerhof generalized gradient approximation (GGA). We have substituted a Tc atom for the <i>x</i>% of Ti atoms using a virtual crystal approximation (VCA), since it has been successfully employed in several doped materials. Our structural findings are in strong accord with the existing experimental and theoretical data regarding titanium's pure structure. For the electronic computations, we have estimated the band structure and the density of states (DOS). Our findings show that each compound is stable, metallic, and conforms to the stability criteria. In terms of elastic characteristics, we found that Ti–10Tc has Young's modulus of 58.45, which is comparable to Young's modulus of human bone (10–30 GPa). Exception of <i>C</i><sub>12</sub>, C<sub>13</sub>, Poisson's ratio, anisotropy, and <i>B</i>/<i>G</i> ratio, all estimated properties of the alloys declined as the Tc concentration increased. In addition, every material under investigation exhibited ductility, necessitating the determination of Young's modulus values for additional applications. Designers can use these studies to produce alternative low-modulus alloys for biomedical purposes.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><img></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163043","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