Pub Date : 2024-06-24DOI: 10.1134/s1063783423600061
Z. Yarar, M. D. Alyörük, H. C. Çekil, B. Özdemir, M. Özdemir
Abstract
The electron mobility characteristics of a ZnMgO/ZnO heterostructure are systematically investigated by an ensemble Monte Carlo method. Screening effects are included in all electron scattering mechanisms. The mobilities are calculated for a temperature range of 4 to 300 K and Mg contents ranging from 8.5 to 44%. In this range, dislocation scattering (DS) and interface roughness scattering (IFR) are highly effective for low and high values of Mg compositions, respectively. Screening effects must be considered in scattering mechanisms to achieve a reasonable agreement with existing experimental results. Our findings could be significant for the design and optimization of ZnO-based devices.
{"title":"Mobility Characteristics of ZnMgO/ZnO Heterostructures with Screening Effects","authors":"Z. Yarar, M. D. Alyörük, H. C. Çekil, B. Özdemir, M. Özdemir","doi":"10.1134/s1063783423600061","DOIUrl":"https://doi.org/10.1134/s1063783423600061","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The electron mobility characteristics of a ZnMgO/ZnO heterostructure are systematically investigated by an ensemble Monte Carlo method. Screening effects are included in all electron scattering mechanisms. The mobilities are calculated for a temperature range of 4 to 300 K and Mg contents ranging from 8.5 to 44%. In this range, dislocation scattering (DS) and interface roughness scattering (IFR) are highly effective for low and high values of Mg compositions, respectively. Screening effects must be considered in scattering mechanisms to achieve a reasonable agreement with existing experimental results. Our findings could be significant for the design and optimization of ZnO-based devices.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503211","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}
This study investigates the impact of spin torque diode (STD) effect in a composite spin valve pillar, comprising distinct magnetic and non-magnetic layers arranged as AF/F0/NM1/F1/NM2/F2. Our investigation delves into the foundational mechanisms governing the STD effect within this magnetic multilayer system. Through the utilization of the composite spin valve pillar as a dynamic platform, we unravel the intricate interplay between spin-dependent charge transport and magnetic fields. Our inquiry is to understand diverse structural parameters, allowing us to unveil its operational capabilities and optimize its functionality across varied operating conditions. Furthermore, our exploration encompasses the quantification of detection sensitivity, scrutinizing the relationship between output voltage and applied input power. In our study, we have done an analysis of crucial parameters such as current, resistance, and sensitivity in the STD system. Our findings showcase the manifestation of the spin diode effect in low-dimensional magnetic structure. This finding indicates the feasibility of fabricating a spin diode device with diverse potential applications.
{"title":"Exploring the Spin Torque Diode Effect in Low Dimensional Magnetic Multilayer Structure","authors":"Rishma Thilakaraj, Kanimozhi Natarajan, Amuda Rajamani, Brinda Arumugam","doi":"10.1134/s1063783424600626","DOIUrl":"https://doi.org/10.1134/s1063783424600626","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This study investigates the impact of spin torque diode (STD) effect in a composite spin valve pillar, comprising distinct magnetic and non-magnetic layers arranged as AF/F0/NM1/F1/NM2/F2. Our investigation delves into the foundational mechanisms governing the STD effect within this magnetic multilayer system. Through the utilization of the composite spin valve pillar as a dynamic platform, we unravel the intricate interplay between spin-dependent charge transport and magnetic fields. Our inquiry is to understand diverse structural parameters, allowing us to unveil its operational capabilities and optimize its functionality across varied operating conditions. Furthermore, our exploration encompasses the quantification of detection sensitivity, scrutinizing the relationship between output voltage and applied input power. In our study, we have done an analysis of crucial parameters such as current, resistance, and sensitivity in the STD system. Our findings showcase the manifestation of the spin diode effect in low-dimensional magnetic structure. This finding indicates the feasibility of fabricating a spin diode device with diverse potential applications.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503208","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}
Pub Date : 2024-06-24DOI: 10.1134/s1063783423600292
O. Nasri, J. Zaghdoudi, M. Kanzari
Abstract
The theoretical investigation of the temperature dependence in hybrid one-dimensional photonic crystals with a metal defect involved simultaneously considering thermal expansion effect and thermal-optical effect. Firstly, we study the effect of the number of iterations in the H(LH)NH(LH)N and H(LH)NSH(LH)N systems, where H (GaAs) and L (Bi4Ge3O12 “BGO”) are two different materials with constant refractive index nH (nGaAs = 3.3) and nL (nBGO = 2.31), respectively. S is a metal chosen as the Ag. The presence of metal S enhances noticeably the sensitivity for the temperature. It has been shown that when N increases the transmission peak λpeak shifts to higher wavelengths for the structure H(LH)NH(LH)N. We show that the proposed device H(LH)NSH(LH)N can be used as a temperature sensor. Indeed, the sensitivity changes from the value 4.5 pm K–1 in the absence of the metal layer to the value 17 pm K–1 in its presence. Enhancing the sensitivity of the H (LH)NSH(LH)N component, we proceeded to a deformation of the system by the application of a law of the type y = x1 +k, where y denotes the deformation coordinate of the structure H(LH)NSH(LH)N and x the coordinate before deformation. The degree of deformation is defined by the coefficient k. The value of N is chosen equal to 4. This value corresponds to the minimum of layers of the system leading to its satisfactory performance. We show in this case that the sensitivity increases by increasing the positive value of k.
摘要 对带有金属缺陷的混合一维光子晶体的温度依赖性进行理论研究，需要同时考虑热膨胀效应和热光效应。首先，我们研究了 H(LH)NH(LH)N 和 H(LH)NSH(LH)N 系统中迭代次数的影响，其中 H（砷化镓）和 L（Bi4Ge3O12 "BGO"）分别是折射率 nH（nGaAs = 3.3）和 nL（nBGO = 2.31）恒定的两种不同材料。S 是一种金属，被选为 Ag。金属 S 的存在明显提高了对温度的敏感度。研究表明，当 N 增加时，H(LH)NH(LH)N 结构的透射峰 λpeak 会向更高波长移动。我们的研究表明，所提出的器件 H(LH)NSH(LH)N 可用作温度传感器。事实上，灵敏度从没有金属层时的 4.5 pm K-1 变为有金属层时的 17 pm K-1。为了提高 H (LH)NSH(LH)N 元件的灵敏度，我们应用 y = x1 + k 的定律对系统进行变形，其中 y 表示 H(LH)NSH(LH)N 结构的变形坐标，x 表示变形前的坐标。变形程度由系数 k 定义。N 的值选择为 4，该值对应于系统的最小层数，因此系统性能令人满意。在这种情况下，我们可以看到，K 的正值越大，灵敏度越高。
{"title":"Temperature Sensor Based on Deformed One-Dimensional Nanometallic Photonic Crystals","authors":"O. Nasri, J. Zaghdoudi, M. Kanzari","doi":"10.1134/s1063783423600292","DOIUrl":"https://doi.org/10.1134/s1063783423600292","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The theoretical investigation of the temperature dependence in hybrid one-dimensional photonic crystals with a metal defect involved simultaneously considering thermal expansion effect and thermal-optical effect. Firstly, we study the effect of the number of iterations in the H(LH)<sup><i>N</i></sup>H(LH)<sup><i>N</i></sup> and H(LH)<sup><i>N</i></sup>SH(LH)<sup><i>N</i></sup> systems, where H (GaAs) and L (Bi<sub>4</sub>Ge<sub>3</sub>O<sub>12</sub> “BGO”) are two different materials with constant refractive index <i>n</i>H (<i>n</i><sub>GaAs</sub> = 3.3) and <i>n</i>L (<i>n</i><sub>BGO</sub> = 2.31), respectively. S is a metal chosen as the Ag. The presence of metal S enhances noticeably the sensitivity for the temperature. It has been shown that when N increases the transmission peak λ<sub>peak</sub> shifts to higher wavelengths for the structure H(LH)<sup><i>N</i></sup>H(LH)<sup><i>N</i></sup>. We show that the proposed device H(LH)<sup><i>N</i></sup>SH(LH)<sup><i>N</i></sup> can be used as a temperature sensor. Indeed, the sensitivity changes from the value 4.5 pm K<sup>–1</sup> in the absence of the metal layer to the value 17 pm K<sup>–1</sup> in its presence. Enhancing the sensitivity of the H (LH)<sup><i>N</i></sup>SH(LH)<sup><i>N</i></sup> component, we proceeded to a deformation of the system by the application of a law of the type <i>y</i> = <i>x</i><sup>1 +</sup> <sup><i>k</i></sup>, where <i>y</i> denotes the deformation coordinate of the structure H(LH)<sup><i>N</i></sup>SH(LH)<sup><i>N</i></sup> and <i>x</i> the coordinate before deformation. The degree of deformation is defined by the coefficient <i>k</i>. The value of <i>N</i> is chosen equal to 4. This value corresponds to the minimum of layers of the system leading to its satisfactory performance. We show in this case that the sensitivity increases by increasing the positive value of <i>k</i>.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503205","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}
Pub Date : 2024-06-24DOI: 10.1134/s1063783423600395
Chirag Saharan, Deepak Singhwal, Pawan S. Rana
Abstract
As the demand for sustainable energy solutions rises, the development of energy-efficient technologies becomes imperative. Smart windows, incorporating thermochromic materials, emerge as promising contributors to reducing building energy consumption. Vanadium dioxide (VO2), known for its thermochromic properties, faces challenges in commercial application due to its limited visible light transmittance. This study addresses these challenges by utilizing quartz as a substrate and depositing VO2 thin films using radio frequency sputtering. To enhance optical performance, a bilayer structure was created by integrating this single-layer film with SnO2. Room-temperature X-ray diffraction confirmed the single-phase growth of VO2 on quartz, and XRD validated the proper fabrication of films. Ultraviolet-visible spectroscopy at room temperature substantiated the improved transmittance of the SnO2/VO2 bilayer, marking a significant advancement toward more efficient and commercially viable smart windows. This research highlights the potential of SnO2-based thin films in mitigating the visible light transmittance limitations of VO2, thus opening avenues for advanced smart window applications with enhanced energy-saving capabilities. Additionally, Atomic Force Microscopy (AFM) was employed to compare the roughness of the films, and the impact of reduced roughness on optical transmittance was evaluated. The results contribute to the optimization of smart window technologies for broader sustainable energy applications.
摘要 随着对可持续能源解决方案的需求不断增加，开发节能技术势在必行。采用热致变色材料的智能窗户在降低建筑能耗方面大有可为。二氧化钒（VO2）因其热致变色特性而闻名，但由于其有限的可见光透射率，在商业应用中面临挑战。本研究利用石英作为基底，通过射频溅射沉积二氧化钒薄膜，从而解决了这些难题。为了提高光学性能，研究人员将这种单层薄膜与二氧化硫整合在一起，形成了双层结构。室温 X 射线衍射证实了 VO2 在石英上的单相生长，而 X 射线衍射则验证了薄膜的正确制造。室温下的紫外可见光谱证实了二氧化锡/二氧化钛双层膜透光率的提高，标志着在实现更高效、更具商业价值的智能窗户方面取得了重大进展。这项研究凸显了二氧化锡薄膜在缓解 VO2 可见光透过率限制方面的潜力，从而为具有更强节能能力的先进智能窗应用开辟了道路。此外，研究还采用原子力显微镜（AFM）比较了薄膜的粗糙度，并评估了粗糙度降低对透光率的影响。这些结果有助于优化智能窗技术，以实现更广泛的可持续能源应用。
{"title":"Fabrication and Optical Characteristics of Thin Films Comprising VO2 and SnO2","authors":"Chirag Saharan, Deepak Singhwal, Pawan S. Rana","doi":"10.1134/s1063783423600395","DOIUrl":"https://doi.org/10.1134/s1063783423600395","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>As the demand for sustainable energy solutions rises, the development of energy-efficient technologies becomes imperative. Smart windows, incorporating thermochromic materials, emerge as promising contributors to reducing building energy consumption. Vanadium dioxide (VO<sub>2</sub>), known for its thermochromic properties, faces challenges in commercial application due to its limited visible light transmittance. This study addresses these challenges by utilizing quartz as a substrate and depositing VO<sub>2</sub> thin films using radio frequency sputtering. To enhance optical performance, a bilayer structure was created by integrating this single-layer film with SnO<sub>2</sub>. Room-temperature X-ray diffraction confirmed the single-phase growth of VO<sub>2</sub> on quartz, and XRD validated the proper fabrication of films. Ultraviolet-visible spectroscopy at room temperature substantiated the improved transmittance of the SnO<sub>2</sub>/VO<sub>2</sub> bilayer, marking a significant advancement toward more efficient and commercially viable smart windows. This research highlights the potential of SnO<sub>2</sub>-based thin films in mitigating the visible light transmittance limitations of VO<sub>2</sub>, thus opening avenues for advanced smart window applications with enhanced energy-saving capabilities. Additionally, Atomic Force Microscopy (AFM) was employed to compare the roughness of the films, and the impact of reduced roughness on optical transmittance was evaluated. The results contribute to the optimization of smart window technologies for broader sustainable energy applications.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503207","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}
Pub Date : 2024-06-11DOI: 10.1134/s1063783424600468
R. C. Bharamagoudar, A. S. Patil, S. N. Mathad
Abstract
This study focuses on the synthesis and characterization of calcium–zinc Ca1–xZnxFe2O4 (x = 0, 0.25, 0.50, 0.75, 1.0) (Ca–Zn) ferrite nanoparticles by the solution combustion synthesis (SCS), exploring their potential applications in various technological fields. The characterization involved a comprehensive analysis of their structural, magnetic, and morphological features using various techniques such as X-ray diffraction, transport properties, biological studies and magnetic measurements. Understanding the synthesis process and the resulting nanoparticle properties is crucial for harnessing their unique attributes in diverse fields like biomedical engineering, magnetic storage.
{"title":"Exploring Calcium–Zinc Ferrite Nanoparticles: Synthesis, Properties, and Applications","authors":"R. C. Bharamagoudar, A. S. Patil, S. N. Mathad","doi":"10.1134/s1063783424600468","DOIUrl":"https://doi.org/10.1134/s1063783424600468","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This study focuses on the synthesis and characterization of calcium–zinc Ca<sub>1–<i>x</i></sub>Zn<sub><i>x</i></sub>Fe<sub>2</sub>O<sub>4</sub> (<i>x</i> = 0, 0.25, 0.50, 0.75, 1.0) (Ca–Zn) ferrite nanoparticles by the solution combustion synthesis (SCS), exploring their potential applications in various technological fields. The characterization involved a comprehensive analysis of their structural, magnetic, and morphological features using various techniques such as X-ray diffraction, transport properties, biological studies and magnetic measurements. Understanding the synthesis process and the resulting nanoparticle properties is crucial for harnessing their unique attributes in diverse fields like biomedical engineering, magnetic storage.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503210","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}
Pub Date : 2024-06-11DOI: 10.1134/s1063783424600547
Chenglong Lei, Siyu Zhu, Zhiye Wang, Qi Jia
Abstract
BaFe12–2xNixZrxO19 (x = 0–1) ferrites were successfully synthesized by hydrothermal method based on metal chloride. The synergistic effects of Ni2+–Zr4+ ions doping and heat treatment on microstructure and ions distribution to tailoring the magnetic properties were studied. Without calcination the traces of BaCO3 appears in all samples where the Fe2O3 phase appears at x > 0.6. It exhibits very good hexagonal crystals with doping content x < 0.8, but deviate from hexagonal flakes for x = 1. With low temperature 950°C calcination, the pure phase and the uniform distribution of particle size were obtained. XPS characterization show that the concentrations of non-lattice oxygen decrease, where Fe2+ contents slightly increase and then decrease with increasing Ni2+–Zr4+ ions. The comprehensive magnetic properties, especially the saturation magnetization, of doped ferrites prepared by hydrothermal method decrease sharply when x > 0.6. The anisotropy field also decreases to the lowest at x = 0.6. By comparing the magnetic properties under heat treatment conditions, the optimum annealing temperature is 1000°C, where the saturation magnetization (Ms) increases up to 59.54 emu/g at x = 0.8. Thus, the as-synthesized Ni2+–Zr4+ doping strontium barium hexaferrite will be useful for the applications in security switching, microwave absorption and recording media.
摘要 基于金属氯化物，采用水热法成功合成了BaFe12-2xNixZrxO19（x = 0-1）铁氧体。研究了掺杂 Ni2+-Zr4+ 离子和热处理对微观结构和离子分布的协同作用，以定制磁性能。未经煅烧，所有样品中都出现了 BaCO3 的痕迹，其中 Fe2O3 相出现在 x > 0.6 处。当掺杂含量为 x < 0.8 时，它显示出非常好的六方晶体，但当 x = 1 时，它偏离了六方片状晶体。在 950°C 的低温煅烧下，获得了纯相和均匀分布的粒度。XPS 表征表明，非晶格氧的浓度降低，其中 Fe2+ 的含量略有增加，然后随着 Ni2+-Zr4+ 离子的增加而降低。当 x > 0.6 时，水热法制备的掺杂铁氧体的综合磁性能，尤其是饱和磁化率急剧下降。各向异性场也在 x = 0.6 时降至最低。通过比较热处理条件下的磁性能，最佳退火温度为 1000°C，在 x = 0.8 时，饱和磁化（Ms）增加到 59.54 emu/g。因此，新合成的掺杂 Ni2+-Zr4+ 的六价锶钡铁氧体将在安全开关、微波吸收和记录介质中得到应用。
{"title":"Effect on Structural, Morphological, and Magnetic Hysteresis of Ni2+–Zr4+ Co-Substituted Barium Hexaferrites by Hydrothermal Synthesis","authors":"Chenglong Lei, Siyu Zhu, Zhiye Wang, Qi Jia","doi":"10.1134/s1063783424600547","DOIUrl":"https://doi.org/10.1134/s1063783424600547","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>BaFe<sub>12–2<i>x</i></sub>Ni<sub><i>x</i></sub>Zr<sub><i>x</i></sub>O<sub>19</sub> (<i>x</i> = 0–1) ferrites were successfully synthesized by hydrothermal method based on metal chloride. The synergistic effects of Ni<sup>2+</sup>–Zr<sup>4+</sup> ions doping and heat treatment on microstructure and ions distribution to tailoring the magnetic properties were studied. Without calcination the traces of BaCO<sub>3</sub> appears in all samples where the Fe<sub>2</sub>O<sub>3</sub> phase appears at <i>x</i> > 0.6. It exhibits very good hexagonal crystals with doping content <i>x</i> < 0.8, but deviate from hexagonal flakes for <i>x</i> = 1. With low temperature 950°C calcination, the pure phase and the uniform distribution of particle size were obtained. XPS characterization show that the concentrations of non-lattice oxygen decrease, where Fe<sup>2+</sup> contents slightly increase and then decrease with increasing Ni<sup>2+</sup>–Zr<sup>4+</sup> ions. The comprehensive magnetic properties, especially the saturation magnetization, of doped ferrites prepared by hydrothermal method decrease sharply when <i>x</i> > 0.6. The anisotropy field also decreases to the lowest at <i>x</i> = 0.6. By comparing the magnetic properties under heat treatment conditions, the optimum annealing temperature is 1000°C, where the saturation magnetization (Ms) increases up to 59.54 emu/g at <i>x</i> = 0.8. Thus, the as-synthesized Ni<sup>2+</sup>–Zr<sup>4+</sup> doping strontium barium hexaferrite will be useful for the applications in security switching, microwave absorption and recording media.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503212","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}
Pub Date : 2024-06-11DOI: 10.1134/s1063783424600584
J. A. Lazzús
Abstract
In this study, we obtain an expression to calculate the probability of electron transmission in a linear chain of N quantum dots with fluctuations of the potential levels on the Fermi seas of each point. Here, the transmission probability model is based on concepts of Probability Theory. From this expression, we determine the transmission in the chain under these fluctuations. Besides, Anderson localization and other transport properties were studied using numerical simulations. Results show the impact of fluctuations on transmission efficiency and aid in comprehensively understanding electron transport in quantum dot systems.
摘要 在本研究中，我们获得了一个表达式，用于计算电子在由 N 个量子点组成的线性链中的传输概率。这里的传输概率模型基于概率论的概念。根据这一表达式，我们可以确定在这些波动下链条中的传输。此外，我们还利用数值模拟研究了安德森定位和其他传输特性。结果显示了波动对传输效率的影响，有助于全面理解量子点系统中的电子传输。
{"title":"Transport and Localization in Quantum Dot Chains with Fluctuations: A Simple Probabilistic Model","authors":"J. A. Lazzús","doi":"10.1134/s1063783424600584","DOIUrl":"https://doi.org/10.1134/s1063783424600584","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this study, we obtain an expression to calculate the probability of electron transmission in a linear chain of <i>N</i> quantum dots with fluctuations of the potential levels on the Fermi seas of each point. Here, the transmission probability model is based on concepts of Probability Theory. From this expression, we determine the transmission in the chain under these fluctuations. Besides, Anderson localization and other transport properties were studied using numerical simulations. Results show the impact of fluctuations on transmission efficiency and aid in comprehensively understanding electron transport in quantum dot systems.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503209","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}
Pub Date : 2024-06-11DOI: 10.1134/s1063783424600705
Manisha Dagar, Suresh Kumar, Amit Jain, Manohar Singh, Virender Kundu
Abstract
In this research, a mesoporous Mn/Fe/N-doped ZnO nanocomposite was developed via solvothermal synthesis, focusing on its optical and magnetic potentials for dye degradation. FTIR spectroscopy identified unique functional groups, while EDX analysis confirmed its elemental composition. BET analysis showcased an expanded surface area due to mesoporosity, evidenced by a type IV isotherm. UV-Visible spectroscopy revealed a red shift and optical band gap reduction from 3.13 to 2.68 eV, indicating improved light absorption. SEM provided insights into distinctive morphologies, and PL studies showed reduced electron-hole recombination in highly doped samples. SQUID measurements verified the nanocomposite’s ferromagnetic characteristics. These properties collectively enhance its photocatalytic efficacy against Congo red and Methylene blue dyes, presenting a viable solution for environmental clean-up.
摘要 本研究通过溶热合成法开发了一种介孔 Mn/Fe/N 掺杂氧化锌纳米复合材料，重点研究了其降解染料的光学和磁学潜力。傅立叶变换红外光谱分析确定了独特的官能团，而电离辐射X分析确认了其元素组成。BET 分析表明，由于介孔的存在，其表面积扩大了，这体现在 IV 型等温线上。紫外-可见光谱分析显示了红移和光带隙从 3.13 eV 减小到 2.68 eV，表明光吸收得到了改善。扫描电子显微镜（SEM）显示了独特的形貌，而 PL 研究则表明高掺杂样品中的电子-空穴重组减少了。SQUID 测量验证了纳米复合材料的铁磁特性。这些特性共同提高了纳米复合材料对刚果红和亚甲基蓝染料的光催化功效，为环境净化提供了可行的解决方案。
{"title":"Study of Optical and Magnetic Properties of Solvothermally Synthesized Mn/Fe/N-Doped ZnO Nanocomposite for Advanced Dye Photodegradation","authors":"Manisha Dagar, Suresh Kumar, Amit Jain, Manohar Singh, Virender Kundu","doi":"10.1134/s1063783424600705","DOIUrl":"https://doi.org/10.1134/s1063783424600705","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this research, a mesoporous Mn/Fe/N-doped ZnO nanocomposite was developed via solvothermal synthesis, focusing on its optical and magnetic potentials for dye degradation. FTIR spectroscopy identified unique functional groups, while EDX analysis confirmed its elemental composition. BET analysis showcased an expanded surface area due to mesoporosity, evidenced by a type IV isotherm. UV-Visible spectroscopy revealed a red shift and optical band gap reduction from 3.13 to 2.68 eV, indicating improved light absorption. SEM provided insights into distinctive morphologies, and PL studies showed reduced electron-hole recombination in highly doped samples. SQUID measurements verified the nanocomposite’s ferromagnetic characteristics. These properties collectively enhance its photocatalytic efficacy against Congo red and Methylene blue dyes, presenting a viable solution for environmental clean-up.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141519469","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}
Janus In2Ge2Te6 bilayer exhibit the potential for low thermal conductivity due to their complex geometry and large atomic mass contrast. The results demonstrate that the intersection of the low-frequency optical branch and the longitudinal acoustic phonon branch (LA) within the Janus In2Ge2Te6 bilayer structure, combined with a larger average atomic mass, leads to a smaller phonon group velocity, a higher phonon scattering rate, a lower phonon relaxation time, and a stronger anharmonicity. These factors contribute to the lower thermal conductivity of the Janus In2Ge2Te6 bilayer. The Janus In2Ge2Te6 bilayer structure exhibits a maximum and minimum lattice thermal conductivity of about 0.35 and 0.1 W/(m K) at 300 and 1000 K, respectively.
{"title":"First-principles Study on the Lattice Thermal Conductivity of Janus In2Ge2Te6 Bilayer","authors":"Wei Ding, Songwen Tian, Yankun Shen, Shijie Yang, Jingze Wang, Ziyang Yuan, Zheng Zhai","doi":"10.1134/s1063783424600535","DOIUrl":"https://doi.org/10.1134/s1063783424600535","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Janus In<sub>2</sub>Ge<sub>2</sub>Te<sub>6</sub> bilayer exhibit the potential for low thermal conductivity due to their complex geometry and large atomic mass contrast. The results demonstrate that the intersection of the low-frequency optical branch and the longitudinal acoustic phonon branch (LA) within the Janus In<sub>2</sub>Ge<sub>2</sub>Te<sub>6</sub> bilayer structure, combined with a larger average atomic mass, leads to a smaller phonon group velocity, a higher phonon scattering rate, a lower phonon relaxation time, and a stronger anharmonicity. These factors contribute to the lower thermal conductivity of the Janus In<sub>2</sub>Ge<sub>2</sub>Te<sub>6</sub> bilayer. The Janus In<sub>2</sub>Ge<sub>2</sub>Te<sub>6</sub> bilayer structure exhibits a maximum and minimum lattice thermal conductivity of about 0.35 and 0.1 W/(m K) at 300 and 1000 K, respectively.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141147462","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}
Pub Date : 2024-05-23DOI: 10.1134/s1063783424600523
A. V. Ionina
Abstract
The mechanisms of hardening surface layers of carbon steel 45 after combined treatment including electroexplosive boroaluminizing, aluminizing with silicon carbide, and electron beam processing (EBP) are revealed. The combined processing leads to an increase in the hardening depth. After the electroexplosive boroaluminizing and EBP, the microhardeness is 16 GPa and the hardening depth is 90 μm; after the electroexplosive aluminizing combined with silicon carbide and EBP, the microhardness is 12.5 GPa and the hardening depth is 50 μm. In the initial state, the microhardness is 2 GPa. In the conditions of dry sliding friction, the wear resistance increases by a factor of 43 after electroexplosive boroaluminizing and EBP, and by a factor of 12 after electroexplosive aluminizing with silicon carbide. The surface hardening is achieved as a result of the formation of fine-disperse nonequilibrium structure containing strengthening phases. The models developed in this work allow one to explain the results by the peculiarities of the thermal and diffusion processes during EBP.
{"title":"Thermal and Diffusion Processes during Electron Beam Processing of Surfaces of Electroexplosive Alloying","authors":"A. V. Ionina","doi":"10.1134/s1063783424600523","DOIUrl":"https://doi.org/10.1134/s1063783424600523","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The mechanisms of hardening surface layers of carbon steel 45 after combined treatment including electroexplosive boroaluminizing, aluminizing with silicon carbide, and electron beam processing (EBP) are revealed. The combined processing leads to an increase in the hardening depth. After the electroexplosive boroaluminizing and EBP, the microhardeness is 16 GPa and the hardening depth is 90 μm; after the electroexplosive aluminizing combined with silicon carbide and EBP, the microhardness is 12.5 GPa and the hardening depth is 50 μm. In the initial state, the microhardness is 2 GPa. In the conditions of dry sliding friction, the wear resistance increases by a factor of 43 after electroexplosive boroaluminizing and EBP, and by a factor of 12 after electroexplosive aluminizing with silicon carbide. The surface hardening is achieved as a result of the formation of fine-disperse nonequilibrium structure containing strengthening phases. The models developed in this work allow one to explain the results by the peculiarities of the thermal and diffusion processes during EBP.</p>","PeriodicalId":731,"journal":{"name":"Physics of the Solid State","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141147460","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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