Physica B-condensed Matter最新文献

{"title":"Emergence of multiple distillable and bound entangled states in a spin-star system","authors":"Mostafa Motamedifar,&nbsp;Fatemeh Sadeghi","doi":"10.1016/j.physb.2025.417179","DOIUrl":"10.1016/j.physb.2025.417179","url":null,"abstract":"<div><div>In quantum systems, entanglement is a fundamental characteristic wherein the state of one particle is inherently interconnected with the states of other particles, even in cases when they are physically distant from each other. Conversely, the phenomenon of distillation pertains to the capacity to extract states with high entanglement from states with lower entanglement. Specifically, it entails the conversion of a collection of quantum states into a reduced set of states with maximal entanglement through the utilization of local operations and classical communication. Through practical and theoretical tools, Barreiro et al. in [Nature Physics, 6, 943 (2010)], showed how the quantum state of a four-qubit system is placed in non-distillable conditions. They showed that the condition which is referred to as the bound entanglement domain occurs when there is entanglement between only some conceivable configurations for subsystems. In addition, they showed that the condition in which there is entanglement in any possible arrangement of system’s components is called free entangled region, which is also distillable. Nevertheless, a significant difference between the findings of the above study and the challenge in the present work can be briefly described as follows: the study by Barreiro’s group showed the existence of a single bound entangled region in their target system, while the present study, indicates the existence of two distinct bound entangled regions. For this purpose, a spin-star system with Heisenberg and Dzyaloshinskii–Moriya interactions has been proposed. We will also show in what conditions the separable regions in terms of entanglement and the free entangled domain will exist.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"707 ","pages":"Article 417179"},"PeriodicalIF":2.8,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143767577","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":"Spectroscopic studies of neodymium-doped borate glasses and calculation of Judd-Ofelt parameters","authors":"Sharwan Kumar,&nbsp;David Joseph","doi":"10.1016/j.physb.2025.417193","DOIUrl":"10.1016/j.physb.2025.417193","url":null,"abstract":"<div><div>Borate glasses doped with Nd₂O₃ [H₃BO₃-Pb₃O₄-ZnO-X Nd₂O₃] have been prepared using the rapid cooling method. Glasses containing different concentrations of Nd₂O₃ doped were prepared in the temperature range of 1100 °C. The glassy nature of the synthesized samples is confirmed by the X-ray diffraction (XRD) pattern. Laser Raman spectra have been recorded using 532 nm and 785 nm laser excitation to study the vibrational nature of the glass structure. In the FT-IR studies, identify the functional group in the neodymium-doped borate glasses. The absorption spectra Tauc plot is used to calculate the optical band gap of the synthesized sample. The spectroscopic properties of the neodymium-doped ions were measured by the Judd-Ofelt theory. Furthermore, to study the synthesized glasses' spectroscopic properties, the absorption spectra are recorded in the range of 400 nm–900 nm. Moreover, the Judd-Ofelt parameter has been calculated for the synthesized sample, the calculated values of Ω_λ X 10⁻²⁰ cm² (λ = 2,4,6) are 2.78, 2.43, 2.57 for BNdBAG, 1.43, 0.97, 1.27 for CNdBAG and 1.48, 1.01, 1.31 for DNdBAG glasses. The spectroscopic quality factor is also calculated for all the synthesized samples. The Judd Ofelt parameter follows the trends Ω₂ &gt; Ω₆ &gt; Ω₄. Phonon lifetime is calculated for all the synthesized samples. Three near-IR emission bands were observed in the neodymium ions-doped borate glasses under the excitation of a 532 nm laser diode. The radiative transitions of ⁴F_3/2 → ⁴I_9/2, ⁴F_3/2 → ⁴I_11/2, and ⁴F_3/2 → ⁴I_13/2 are responsible for the three main emission bands that are produced by the lasing action of Nd³⁺-doped glass at approximately 902, 1021, and 1343 nm, respectively. The radiative lifetime (τ_R) and the decay radiative rate (W_R) are also calculated by using fluorescence spectra.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"707 ","pages":"Article 417193"},"PeriodicalIF":2.8,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143767576","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":"Tunable magnetic transition and thermoelectric performance in single-layer metal dibromides MBr2 (M: Fe and Co)","authors":"Teguh Budi Prayitno ,&nbsp;Esmar Budi ,&nbsp;Riri Jonuarti ,&nbsp;Abdul Rahman Mohmad","doi":"10.1016/j.physb.2025.417166","DOIUrl":"10.1016/j.physb.2025.417166","url":null,"abstract":"<div><div>Investigation of magnetic transition and thermoelectric characteristics in the single-layer metal dibromides 1T-MBr₂ (M: Fe and Co) has been performed by generalized Bloch theorem within density functional theory. Using the lowest total energy, we identified the ferromagnetic, spiral, or antiferromagnetic state formed by a flat spiral configuration in the primitive unit cell. For the non-doped case, FeBr₂ and CoBr₂ possessed the ferromagnetic and spiral ground states, respectively. As the lattice parameter increased, the initial ground state changed to a new ground state, thus creating a magnetic transition. Also, incorporating hole-electron doping led to a magnetic transition, which was sensitive to some lattice parameters. For the optimized lattice parameters, we investigated thermoelectric performance using the initial ground state for some temperatures within the Boltzmann transport theory. We found a low (high) figure of merit in FeBr₂ (CoBr₂) at the Fermi level only for the paramagnetic state, where the temperature was above the Curie temperature. The emergence of a spiral state and a high figure of merit might lead to multiferroic and thermoelectric materials.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"707 ","pages":"Article 417166"},"PeriodicalIF":2.8,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759969","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":"Tunable tri-band negative mass density acoustic metamaterials with nested three-layer hollow tubes","authors":"Limei Hao ,&nbsp;Jifeng Guo ,&nbsp;Dongan Liu ,&nbsp;Xiaole Yan ,&nbsp;Qingning Yang ,&nbsp;Xingchen Tian ,&nbsp;Kaixiang Huang ,&nbsp;Shaofang Pang ,&nbsp;You Xie ,&nbsp;Zhi Chen","doi":"10.1016/j.physb.2025.417194","DOIUrl":"10.1016/j.physb.2025.417194","url":null,"abstract":"<div><div>To relieve the bulkiness of the structures of multiband acoustic metamaterials in isolation applications, a nested three-layer hollow tube (NTLHT) structural unit is presented in this work. This unit was designed to achieve effective acoustic isolation at three different frequency bands. Furthermore, a precise theoretical formula for the resonance frequency was derived by combining the 1D wave approximation principle with the coupling interaction. Three-band acoustic metamaterials with high-performance sound isolation were prepared using the NTLHT structural unit by combining three approaches: simulation, theory and experimentation. The results show that the NTLHT can form three independent transmission-forbidden bands under the condition <em>l</em>_<em>1</em><em>&gt;l</em>_<em>2</em><em>&gt;l</em>_<em>3</em>, whereas the relative tube position of the NTLHT has no effect on the transmission-forbidden band, resulting in high engineering fault tolerance. The forbidden frequency exhibits a redshift with increasing the length or effective cross-sectional area of each tube layer. The theoretical and simulated resonance frequencies are in good agreement; therefore, the geometrical parameters of the structural unit corresponding to the target isolation band can be obtained from the accurate theoretical formula. Thus, the nested tri-band metamaterials with high-performance acoustic isolation can be further custom-designed in three specific frequency bands, and the structure is expected to be used in a wide range of acoustic isolation applications.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"707 ","pages":"Article 417194"},"PeriodicalIF":2.8,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759967","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":"Physical characteristics of Pb2FeSbO6 double perovskite for thermoelectric applications","authors":"Messaoud Caid ,&nbsp;Djamel Rached ,&nbsp;Engin Deligoz ,&nbsp;Youcef Rached ,&nbsp;Habib Rached ,&nbsp;Muhammad Irfani","doi":"10.1016/j.physb.2025.417192","DOIUrl":"10.1016/j.physb.2025.417192","url":null,"abstract":"<div><div>The structural, mechanical, electronic, magnetic, optical, and thermoelectric properties of Pb₂FeSbO₆ double perovskite are investigated using full-potential linear augmented plane-wave (FP-LAPW) method incorporating the generalized gradient approximation (GGA) and GGA plus onsite Coulomb parameter (GGA+U). Pb₂FeSbO₆ crystallizes in a ferromagnetic (FM) cubic structure (space group <em>Fm-3m</em>) with lattice constants of 8.072Å, in good agreement with experimental data. The compound exhibits ductile behavior, as assessed by Poisson and Pugh's ratios. It shows an integer magnetic moment of 5.00<em>μ</em>_<em>B</em> per formula unit and demonstrates semiconductor behavior with bandgaps as follows: under GGA, the band-gap is 2.347eV (Γ-X) in spin-up and is 1.208eV (X-Γ) in spin-down; under GGA+U, the band-gap is 2.923eV (X-Γ) in spin-up and is 1.665eV (X-X) in spin-down. Optical properties reveal strong absorption in the ultraviolet range, and thermoelectric evaluation suggests a promising figure of merit (ZT_max≈1.0 at 300K). These findings underscore the potential of Pb₂FeSbO₆ for thermoelectric and optoelectronic applications.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"707 ","pages":"Article 417192"},"PeriodicalIF":2.8,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747963","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 DFT based investigation of structural stability, optoelectronic and magnetic characteristics of cobalt doped BeS","authors":"Mudassir Ishfaq ,&nbsp;Saba Shahid ,&nbsp;Shatha A. Aldaghfag ,&nbsp;Muhammad Yaseen ,&nbsp;Romeasa Shahzade ,&nbsp;Nasarullah","doi":"10.1016/j.physb.2025.417203","DOIUrl":"10.1016/j.physb.2025.417203","url":null,"abstract":"<div><div>Herein, we computed the magneto-electronic and optical attributes of Co-substituted beryllium sulfide at three distinct concentrations by using first principles approach. Studied Be_1-xCo_xS are stable in cubic phase as revealed from geometry optimization. Spin asymmetric electronic properties reveal their ferromagnetic semiconducting nature for 6.25 % and 12.5 % Co doped BeS while densely doped (25 %) Co-BeS exhibit half metallic nature with 100 % spin polarization. The ferromagnetic ordering was also confirmed by analyzing the obtained magnetic moment integer values which were recorded as 2.99, 5.99, and 11.96 μ_B for corresponding alloys. Iso-surface spin density plots have also been obtained visualizing the localized magnetic textures. Additionally, the investigation also involves a comprehensive analysis of the alloy's optical features, encompassing critical features including the dielectric function. The findings reveal that at different concentrations, Be_0.9375Co_0.0625S, Be_0.875Co_0.125S, and Be_0.75Co_0.25S, the <em>ε</em>₁(0) values are measured to be 6.25, 7.22, and 9.53 eV, respectively. The computed results for optical parameters indicate that the compound demonstrates light absorption in the ultraviolet (UV) region. Consequently, Be_1-xCo_xS exhibits significant promise as a potential candidate for application in spintronic devices.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"707 ","pages":"Article 417203"},"PeriodicalIF":2.8,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143767578","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":"Boosting UV photodetector performance with copper-doped NiO nanoflake thin films","authors":"Hasnaa Hamdy ,&nbsp;Mohamed Sh. Abdel-wahab ,&nbsp;M.T. Tammam ,&nbsp;M.A.K. Elfayoumi ,&nbsp;Mohamed Shaban ,&nbsp;Wael Z. Tawfik","doi":"10.1016/j.physb.2025.417196","DOIUrl":"10.1016/j.physb.2025.417196","url":null,"abstract":"<div><div>In this report, the pristine and copper-doped nickel oxide (NiO) nanoflakes were synthesized at ambient temperature on ITO substrate with different ratio of Cu dopant (0 %, 3 %, 6 %, and 9 %) via the successive ionic layer adsorption and reaction technique. The NiO:Cu nanoflakes' microstructure, surface morphology, composition analysis, optical characteristics, and UV photoconduction analysis were all thoroughly examined. XRD analysis verified the cubic structure occupying the space group (Fm3m) of NiO thin films to be free of any impurity phases. The bandgap values exhibit a decreasing trend with increasing doping concentration. The morphological investigations reveal that all samples show uniformly distributed nanoflakes grains without voids or defect structures. The prepared pure and Cu-doped NiO thin film photodetectors were examined via I-V characteristics and photo-sensing parameters. The results reveal that the 6 % Cu-doped NiO photodetector sample possesses higher photocurrent, improved responsivity of 28.1 × 10⁻² AW⁻¹, detectivity of 13.19 × 10⁹ Jones, and EQE of 75.13 %.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"707 ","pages":"Article 417196"},"PeriodicalIF":2.8,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759968","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":"ZnSe and Cd0.6 Zn0.4Te for isotype heterojunction (IHJ) for photovoltaic applications","authors":"H. Shaban,&nbsp;Manal A. Mahdy,&nbsp;I.K. El Zawawi","doi":"10.1016/j.physb.2025.417197","DOIUrl":"10.1016/j.physb.2025.417197","url":null,"abstract":"<div><div>Thin films of ZnSe, Cd₀.₆Zn₀.₄Te, and Cd₀.₆Zn₀.₄Te/ZnSe were thermally deposited on glass and silicon substrates. XRD results confirm that the films are nanocrystalline and have a cubic structure. Linear and nonlinear optical properties of the films were assessed. The evaluated optical band gap (E_g) values for ZnSe, Cd₀.₆Zn₀.₄Te, and ZnSe/Cd₀.₆Zn₀.₄Te films were 2.95, 1.71, and 1.757 eV, respectively. The electrical study evaluated I-V characteristics, rectification ratios, series and shunt resistance, ideality factor, and barrier height for ZnSe/p-Si, Cd₀.₆Zn₀.₄Te/p-Si heterojunctions, and n-Cd₀.₆Zn₀.₄Te/n-ZnSe isotype junctions at various temperatures. The ideality factor and barrier height results showed that the Cd₀.₆Zn₀.₄Te/p-Si device outperformed the ZnSe/p-Si device in terms of electrical conductivity as temperature increased. The novelty in this study is that the fabrication of the n-ZnSe/n-Cd_0.6Zn_0.4Te isotype junction has a higher current value by about 3 orders of magnitude than the constructions of ZnSe/p-Si and Cd_0.6Zn_0.4Te/p-Si heterojunctions. Furthermore, the significant decrement in its electrical parameters causes an enhancement in its electrical conductivity compared with other formed heterojunctions at room temperature.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"707 ","pages":"Article 417197"},"PeriodicalIF":2.8,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747885","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":"Temperature-dependent electrical transport in InSe layered semiconductor","authors":"Chia-Ti Wu ,&nbsp;Yueh-Chien Lee ,&nbsp;Ruei-San Chen","doi":"10.1016/j.physb.2025.417190","DOIUrl":"10.1016/j.physb.2025.417190","url":null,"abstract":"<div><div>In this presented study, the charge transfer behavior in InSe has been investigated by current-voltage (I-V) curve as a function of temperature. The electrical resistivity is independent of temperature in the range of 30–80 K and decreases with increasing temperature from 80 to 300 K, exhibiting the typical semiconducting nature. It is clear that the decreasing rate of the resistivity is slower and faster in the temperature range of 80–170 K and 170–300 K, respectively. The discussions are shown that the transport mechanism from 80 to 170 K can be described the variable range hopping (VRH) model and tends to the adiabatic small polaron hopping (SPH) model above 170 K.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"707 ","pages":"Article 417190"},"PeriodicalIF":2.8,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739816","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":"Improved flux pinning properties of Graphene Oxide blended La1.85Sr0.15CuO4 (LSCO) superconductor","authors":"Subhransu Kumar Panda,&nbsp;G.D. Varma","doi":"10.1016/j.physb.2025.417188","DOIUrl":"10.1016/j.physb.2025.417188","url":null,"abstract":"<div><div>In this study, the effect of blending various concentrations of Graphene Oxide (GO) on the structural, electrical, magnetic and flux pinning properties of the La_1.85Sr_0.15CuO₄ (LSCO) superconductor is reported. LSCO + x wt. % GO (x = 0.0,0.1,0.3,0.5,1.0) composites have been prepared using the solid-state reaction route. XRD analysis shows that the tetragonal crystal structure of LSCO is unaffected in the composites. It has been observed that the critical temperature (<span><math><mrow><msubsup><mi>T</mi><mi>c</mi><mrow><mi>z</mi><mi>e</mi><mi>r</mi><mi>o</mi></mrow></msubsup></mrow></math></span>) is reduced rapidly with increasing concentration of GO. The critical current density (<span><math><mrow><msub><mi>J</mi><mi>c</mi></msub></mrow></math></span>) and pinning force density (<span><math><mrow><msub><mi>F</mi><mi>p</mi></msub></mrow></math></span>) are enhanced for the LSCO-GO composites compared to pure LSCO, which is attributed to the creation of artificial pinning centres due to the addition of GO. The enhancement in <span><math><mrow><msub><mi>J</mi><mi>c</mi></msub></mrow></math></span> (∼1.91 times) and <span><math><mrow><msub><mi>F</mi><mi>p</mi></msub></mrow></math></span> (∼2.67 times) at 5 K has been found maximum for the 0.3 wt % GO-added composite. The nature of pinning in the samples has been probed using <span><math><mrow><msub><mi>F</mi><mi>p</mi></msub><mrow><mo>(</mo><mi>H</mi><mo>)</mo></mrow></mrow></math></span> data.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"707 ","pages":"Article 417188"},"PeriodicalIF":2.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747967","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}