Brazilian Journal of Physics最新文献_第2页

Binary Mixtures of 4-acetylpyridine and 4-n-alkyloxybenzoic Acids (4Ac.Py:nOBA): Investigations on Mesomorphism 4-乙酰吡啶和4-n-烷基氧基苯甲酸二元混合物（4Ac.Py:nOBA）的介构性研究

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-10-05 DOI: 10.1007/s13538-026-02156-x

Suma Ramachandra Gopady, Srikrishna H. Damodar Kedlaya, Krishna S. V. S. R. Bandaru, Mallikarjun Bhavanari, Venkata Naga Ashok Kumar Attaluri, Shivanand Bhushan, Srinivasulu Maddasani

{"title":"Binary Mixtures of 4-acetylpyridine and 4-n-alkyloxybenzoic Acids (4Ac.Py:nOBA): Investigations on Mesomorphism","authors":"Suma Ramachandra Gopady, Srikrishna H. Damodar Kedlaya, Krishna S. V. S. R. Bandaru, Mallikarjun Bhavanari, Venkata Naga Ashok Kumar Attaluri, Shivanand Bhushan, Srinivasulu Maddasani","doi":"10.1007/s13538-026-02156-x","DOIUrl":"10.1007/s13538-026-02156-x","url":null,"abstract":"<div><p>The induction and stability of mesomorphism in new binary mixtures capable of forming intermolecular hydrogen-bonding (HB) interactions were investigated. The mixtures were prepared by treating 4-acetylpyridine, a nonmesogenic liquid, with mesogenic 4-<i>n</i>-alkyloxybenzoic acids (<i>n</i>OBA, pentyl to undecyl homologues) in a 1:1 molar ratio. The vibrational absorption spectral peak shifts resulting from the interaction between the pyridyl nitrogen of 4-acetylpyridine and the carboxylic acid group of <i>n</i>OBA indicate that HB interactions exist between them in a mixture. Frontier molecular orbitals were assessed by geometrical optimization, and Density Functional Theory (DFT) calculations. Mesomorphic properties were studied using polarizing optical microscopy (POM) and differential scanning calorimetry (DSC). The results indicate that the mixtures exhibit enantiotropic nematic (N) and smectic C (SmC) phases, mirroring the phase types of <i>n</i>OBAs but significantly altering the thermal spans. Smectic G (SmG) phase was induced in some binary mixtures and was monotropic. Both the N and SmC mesophases were stabilized over a wide temperature range. Notably, the melting and clearing temperatures of the mixtures were lower than those of the <i>n</i>OBAs; however, they displayed a substantial enhancement in the mesomorphic thermal ranges. This behavior is fundamentally attributed to the robust nature of the intermolecular HB interactions. These findings reveal that pyridyl moieties can effectively tune the thermal spans and phase variants of the mixtures.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 6","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13538-026-02156-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132370","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

One-Way Flagged Probabilistic Implementation of a Nonlocal Controlled-NOT Gate 非局部控制非门的单向标记概率实现

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-10-05 DOI: 10.1007/s13538-026-02157-w

Xiao-Nan Zhang, Yu-Guang Yang, Guang-Bao Xu, Dong-Huan Jiang

{"title":"One-Way Flagged Probabilistic Implementation of a Nonlocal Controlled-NOT Gate","authors":"Xiao-Nan Zhang, Yu-Guang Yang, Guang-Bao Xu, Dong-Huan Jiang","doi":"10.1007/s13538-026-02157-w","DOIUrl":"10.1007/s13538-026-02157-w","url":null,"abstract":"<div><p>Entanglement-assisted nonlocal gates are key primitives for distributed quantum computing. We investigate a one-way probabilistic implementation of a nonlocal controlled-NOT (CNOT) gate using one shared Bell pair and one classical bit transmitted from Alice to Bob. For arbitrary inputs, including inputs entangled with an external reference system, the honest noiseless protocol realizes a flagged quantum instrument with two equiprobable conditional operations, <b>U</b><sub><b>CNOT</b></sub> and <b>Z</b><sub><b>a</b></sub><b>U</b><sub><b>CNOT</b></sub>. Discarding the branch flag yields a dephased post-CNOT channel rather than a mixture of CNOT and the identity operation. We further show that Alice’s ability to infer the branch is input dependent and provide an explicit counterexample to input-independent branch obliviousness. Qiskit Aer simulations verify the branch probabilities, conditional process fidelities, local trace distances, and behavior under specified depolarizing-noise and heralded-erasure models. The construction should therefore be viewed as a compact nonlocal-gate primitive and a demonstration of the communication–correction trade-off, rather than as a realization of standard all-or-nothing oblivious transfer.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 6","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132368","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

Sagnac Interferometer-assisted Microwave Photonic Link for 5G mmWave Signal Generation 5G毫米波信号产生的Sagnac干涉仪辅助微波光子链路

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-10-02 DOI: 10.1007/s13538-026-02159-8

Kajal Shiv Raj Meena, Mandeep Singh

{"title":"Sagnac Interferometer-assisted Microwave Photonic Link for 5G mmWave Signal Generation","authors":"Kajal Shiv Raj Meena, Mandeep Singh","doi":"10.1007/s13538-026-02159-8","DOIUrl":"10.1007/s13538-026-02159-8","url":null,"abstract":"<div><p>The demand for high-capacity, low-latency communication systems in 5G networks has driven the development of innovative signal generation techniques, particularly in the millimeter wave (mmWave) spectrum. This paper proposes a novel optical link architecture that incorporates two parallel Mach-Zehnder modulators (MZMs) in series with a fiber based Sagnac loop. A Sagnac loop is known for introducing phase modulation to an input optical signal. This approach offers advantages, such as enhanced spectral purity, sideband suppression ratio, and cost-effectiveness compared to conventional methods. The proposed model is validated through both simulation and experimental results, demonstrating agreement between the predicted 2nd and 4th order harmonics and the generated RF spectrum peaks at 24 GHz (frequency-doubled), and 48 GHz (frequency-quadrupled). It confirms an optical sideband suppression ratio (OSSR) of 28 dB and a radio frequency sideband suppression ratio (RFSSR) of 57 dB. The optical carrier suppression and the quality of generated mmWave signals are investigated under varying system parameters. A phase noise of -108.69 dBc/Hz has been achieved at 10 kHz offset frequency. The results confirm the robustness and reliability of the proposed approach in real-world applications, such as wireless communication, radar systems, and sensing applications.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 6","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132119","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

Ryzhov’s Defect Formalism on A Rigid-Slip Strip: Dislocations in an Ideal Quasi-One-Dimensional Wigner Crystal 刚性滑移带上的Ryzhov缺陷形式：理想准一维维格纳晶体中的位错

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-10-02 DOI: 10.1007/s13538-026-02154-z

Airat G. Kiiamov, Dmitrii A. Tayurskii

引用次数: 0

Designing Noble Metal Nanoparticle Interfaces for Biosensing: A Fabrication-to-Validation Roadmap 设计用于生物传感的贵金属纳米颗粒界面：从制造到验证路线图

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-10-02 DOI: 10.1007/s13538-026-02161-0

João Victor Vieira Lessa, Leonardo Peres Chiaradia Costa, Éder José Guidelli, Marcelo Mulato

{"title":"Designing Noble Metal Nanoparticle Interfaces for Biosensing: A Fabrication-to-Validation Roadmap","authors":"João Victor Vieira Lessa, Leonardo Peres Chiaradia Costa, Éder José Guidelli, Marcelo Mulato","doi":"10.1007/s13538-026-02161-0","DOIUrl":"10.1007/s13538-026-02161-0","url":null,"abstract":"<div><p>Noble metal nanoparticles have become central components of biosensor design, yet their contribution is often described mainly in terms of signal enhancement or diagnostic performance. This review takes a complementary perspective by focusing on how gold, silver, and platinum nanoparticles become functional biosensing interfaces through controlled synthesis, interfacial incorporation, surface functionalization, characterization, and analytical validation. We first examine how colloidal synthesis, direct substrate growth, electrodeposition, thin-film-derived nanostructuring, organized film assembly, and nanocomposite formation produce interfaces with distinct optical, electrical, catalytic, and surface-chemical properties. We then discuss how linker chemistry, receptor immobilization, blocking, and antifouling strategies determine whether a nanoparticle-modified surface becomes a selective biosensor. Characterization is treated as a question-driven framework for verifying nanomaterial formation, interfacial assembly, biorecognition-layer immobilization, charge-transfer or optical response, and analytical reliability. Representative electrochemical, conductometric, colorimetric, and plasmonic platforms are analyzed to show that noble metal nanoparticles do not act as universal enhancers, but rather as catalytic domains, conductive modifiers, immobilization supports, signal tags, or plasmonic transducers depending on the sensing architecture. Finally, we highlight reproducibility, matrix effects, fouling, scalability, and validation in real samples as key barriers to translation. By reframing noble metal nanoparticle biosensors as engineered interfaces, this review emphasizes that analytical performance depends on aligning material properties, interface architecture, and sensing mechanism.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 6","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13538-026-02161-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132146","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

Segmental Dynamics and Complex Viscosity of a Confined Charged Rouse Chain in a Magnetic Field 磁场中约束荷电链的节段动力学和复黏性

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-09-26 DOI: 10.1007/s13538-026-02152-1

James E. Monteroso, Bienvenido M. Butanas Jr.

{"title":"Segmental Dynamics and Complex Viscosity of a Confined Charged Rouse Chain in a Magnetic Field","authors":"James E. Monteroso, Bienvenido M. Butanas Jr.","doi":"10.1007/s13538-026-02152-1","DOIUrl":"10.1007/s13538-026-02152-1","url":null,"abstract":"<div><p>We develop an analytically tractable overdamped Rouse model for a harmonically confined chain of charged Brownian beads in a uniform magnetic field. Normal-mode analysis shows that the Lorentz coupling converts transverse relaxation into damped rotation, while the longitudinal motion remains purely relaxational. From the mode correlations, we derive the segmental mean-square displacement and the finite-frequency viscoelastic response. The segmental motion crosses from short-time diffusion to intermediate Rouse-like <span>(t^{1/2})</span> subdiffusion and, under confinement, to a finite long-time plateau. The magnetic field changes the transient approach to equilibrium without changing the long-time plateau. Its effects are more pronounced in the finite-frequency rheological response, where it modifies the complex viscosity and the storage and loss moduli, while leaving the zero-frequency viscosity unchanged. From the present analysis, increasing the magnetic field is predicted to shift the viscoelastic response toward lower frequencies and enhance the loss-modulus peak. These effects provide experimentally testable signatures through oscillatory-shear frequency sweeps. Highly charged colloidal chains and complex-plasma systems provide possible platforms for testing these predictions.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 6","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149133025","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

Atomistic Modeling of Nonlinear Energy Transmission in Aluminum 铝中非线性能量传输的原子模型

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-09-22 DOI: 10.1007/s13538-026-02151-2

R. T. Murzaev, O. V. Bachurina

{"title":"Atomistic Modeling of Nonlinear Energy Transmission in Aluminum","authors":"R. T. Murzaev, O. V. Bachurina","doi":"10.1007/s13538-026-02151-2","DOIUrl":"10.1007/s13538-026-02151-2","url":null,"abstract":"<div><p>Nonlinear energy transmission in a three-dimensional, defect-free aluminum crystal is investigated using molecular dynamics simulations. Local harmonic excitation of a pair of neighboring atoms at frequencies above the phonon spectrum is employed to examine the supratransmission phenomenon. An amplitude-dependent critical driving frequency is identified that separates transmitting and non-transmitting regimes. Below this threshold, vibrational energy is injected into the lattice through the spontaneous nucleation of discrete breathers, which propagate away from the excitation region and enable energy transfer beyond the limits of linear phonon propagation. Above the threshold, the injected energy remains localized near the driven atoms, and supratransmission is suppressed. A correlation between the nucleation time and propagation velocity of discrete breathers is established: higher driving frequencies and amplitudes lead to faster breather formation and increased velocities. These results highlight the central role of discrete breathers in facilitating energy transmission in frequency regimes inaccessible to conventional phonon-mediated mechanisms.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 6","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149034968","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

Fock-state Filtering of Squeezed States: Enhanced Nonclassicality and Effects of a Thermal Bath 挤压态的Fock-state滤波：增强的非经典性和热浴的效果

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-09-21 DOI: 10.1007/s13538-026-02146-z

João Pedro Gonzalez de Oliveira, Antonio Vidiella-Barranco

引用次数: 0

Correction: Coherent Manipulation of Optical Force Birefringence in Chiral Atomic Medium 修正：手性原子介质中光力双折射的相干操纵

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-09-16 DOI: 10.1007/s13538-026-02149-w

Iqbal Hussain, Asghar Ali, Bakht Amin Bacha, Ali Akgül

引用次数: 0

Impact of Dipolar and Antisymmetric Interactions on Quantum Correlations in a Mixed-Spin Two-Site System 偶极和反对称相互作用对混合自旋二元体系中量子相关的影响

IF 1.8 4区物理与天体物理

Brazilian Journal of Physics Pub Date : 2026-09-11 DOI: 10.1007/s13538-026-02145-0

B. Adnane, Y. Moqine, A. Khribach, A. Benaoum, R. Houça

{"title":"Impact of Dipolar and Antisymmetric Interactions on Quantum Correlations in a Mixed-Spin Two-Site System","authors":"B. Adnane, Y. Moqine, A. Khribach, A. Benaoum, R. Houça","doi":"10.1007/s13538-026-02145-0","DOIUrl":"10.1007/s13538-026-02145-0","url":null,"abstract":"<div><p>In this work, we investigate the quantum correlations of a hybrid-spin (1/2, 1) system governed by an XXZ Hamiltonian that incorporates both a dipolar coupling and the antisymmetric Dzyaloshinskii–Moriya interaction. By determining the full energy spectrum and constructing the corresponding thermal density matrix, we systematically analyze how entanglement, quantum coherence, and measurement-induced disturbance evolve under the combined influence of interaction parameters and temperature. Our results reveal a clear hierarchy of robustness: while entanglement is highly sensitive to thermal fluctuations, measurement-induced disturbance and coherence persist over a considerably broader range, demonstrating their superior resilience. Moreover, by extending the comparison to the two-qubit framework, we show that the restricted Hilbert space of the latter amplifies the effects of both dipolar and Dzyaloshinskii–Moriya interactions, leading to abrupt changes in entanglement due to the direct mixing between singlet and triplet states. In contrast, the qubit–qutrit system benefits from the additional magnetic sublevels of the spin-1 particle, which open multiple transition pathways and redistribute quantum correlations across an enlarged Hilbert space, thereby producing a smoother and less fragile dynamical response. Taken together, these observations provide a unified perspective on the complementary roles played by dipolar and Dzyaloshinskii–Moriya couplings in shaping the behavior of quantum correlations and highlight the potential of mixed-spin architectures for achieving enhanced stability in thermally noisy environments.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"56 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927741","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