Article
Optics
Zhiyong Wang, Yanghong Ou, Shiyu Wang, Yanzi Meng, Zi Wang, Xiang Zhai, Lingling Wang, Shengxuan Xia
Summary: In this paper, an easy-to-implement metamaterial absorber based on bulk Dirac semimetal is presented. The device achieves ultrahigh quality factor and excellent sensing performance, with precise control over resonance wavelength by adjusting the parameters. It has high-performance applications in terahertz filtering, detection, and biochemical sensing.
Article
Materials Science, Multidisciplinary
BaoJing Hu, Ming Huang, Li Yang, Jinyan Zhao
Summary: A terahertz dual-tunable polarization-independent metamaterial absorber based on hybrid gold-graphene-strontium titanate (STO)-vanadium dioxide (VO2) configuration is proposed. The absorber achieves an absorption rate of 98.3% at 0.2 THz, and the absorption frequency and rate can be dual-tuned by adjusting the chemical potential of graphene and the temperature of STO and VO2. The theoretical analysis using coupled mode theory and impedance matching theory provides insights into the absorber's performance, and the changes in absorption spectra when modifying the depth of STO and VO2 layers are discussed.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Optics
Liwei Zhang, Wanfang Liu, Pablo Cencillo-Abad, Qin Wang, Xing Huang, Yumin Leng
Summary: A broadband tunable metamaterial absorber that is insensitive to polarization and angle for terahertz frequencies is proposed. The absorber consists of a dielectric layer, wheel-shaped vanadium dioxide (VO2) inclusions, and a Dirac semimetal (DS) backplane. Numerical simulations show that the absorption performance can be adjusted by changing various parameters, achieving an ultra-wideband absorptance of over 90% from 4.04 THz to 9.41 THz. The absorber possesses polarization-independence, wide-angle tolerance, and a high sensitivity for refractive index changes. It has potential applications in terahertz energy harvesting, sensing, and modulation.
OPTICS COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Xiaomei Yao, Shengxi Zhang, Qiang Sun, Peizong Chen, Xutao Zhang, Libo Zhang, Jian Zhang, Yan Wu, Jin Zou, Pingping Chen, Lin Wang
Summary: The study presents a highly sensitive, low-energy photodetector based on a Cd3As2 planar structure, demonstrating fast response and operation up to terahertz band wavelengths at room temperature. The manipulation of Dirac fermions and electromagnetic-coupling effects have been effectively utilized, showing potential for developing high-performance, scalable low-energy photodetectors in the highly sought-after THz band.
Article
Optics
Meng Liu, Wenjing Kang, Yanliang Zhang, Huiyun Zhang, Yuping Zhang, Dehua Li
Summary: The authors presented a tunable- and switchable-metamaterial absorber at the terahertz frequency, which can switch between traditional and coherent absorber states. By manipulating the conductivity and phase of the materials, the absorptivity can be dynamically modified in different states.
OPTICS COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
V. Sepahvandi, B. Rezaei, A. H. Aly
Summary: This paper proposes a multichannel terahertz optical filter based on a one-dimensional photonic crystal with a third-order Fibonacci structure, including a bulk Dirac semimetal. The tuning of the optical properties of the proposed structure has been theoretically studied as a function of the Dirac semimetals' Fermi energy. Furthermore, the effects of the Fibonacci structure's periodic number and light's incident angle on optical channels were investigated. The results reveal that changes in the Fermi energy and incident angle remarkably affect the frequency and transmission of the optical channels. Additionally, the number of optical channels increases by increasing the periodic number of the Fibonacci structure.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
Qi Shen, Han Xiong
Summary: This study proposes and numerically analyzes a perfect THz metamaterial absorber based on BDS and STO. By integrating two new materials with adjustable dielectric constant in one structure, the performance of this design can be flexibly controlled. Further research proves that this designed absorber shows outstanding feature of angular insensitivity.
RESULTS IN PHYSICS
(2022)
Article
Physics, Multidisciplinary
Shengxiong Lai, Wei Xu, Zhuchuang Yang, Liming Lu, Kun Wang, Sen Feng, Sijian Zhang, Yangkuan Wu, Ben-Xin Wang
Summary: This paper introduces a quad-band terahertz metamaterial absorber with near-perfect absorption. The absorber consists of a patterned Au layer and a continuous Au film separated by an insulating dielectric layer. It achieves four separated terahertz absorption peaks with narrow bandwidths and large absorptance. The physical mechanisms and performance of the proposed configuration are discussed, and potential applications in thermal radiation, spectral imaging, sensing, detecting, and electromagnetic stealth are explored.
Article
Optics
Yan Cheng, Wenhan Cao, Guangqing Wang, Xiaoyong He, Fangting Lin, Feng Liu
Summary: By depositing a trapezoidal dielectric stripe on a 3D Dirac semimetal hybrid plasmonic waveguide, the thermal tunable propagation properties in the terahertz regime were systematically investigated. The results show that the width of the trapezoidal stripe affects the propagation length and figure of merit (FOM), with both decreasing as the upper side width increases. The propagation properties are also strongly influenced by temperature, with a modulation depth of more than 96% within the range of 3-600 K.
Article
Physics, Applied
Xiaoyong He, Feng Liu, Fangting Lin, Wangzhou Shi
Summary: The tunable propagation properties of 3D Dirac semimetal patterned metamaterial structures in the terahertz regime have been symmetrically investigated. The results show that resonant properties are highly sensitive to the thicknesses of DSM MMs and support strong LC and dipolar resonances. By increasing the Fermi level, resonant strength becomes stronger, and asymmetrical resonators can achieve a very sharp Fano resonant peak with a large Q-factor.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Xiaoyong He, Fangting Lin, Feng Liu, Wangzhou Shi
Summary: Based on 3D Dirac semimetals, the tunable propagation properties of quasi-bound in continuum resonance have been investigated. The results show that by altering the rotation angle of elliptical resonator, a sharp BIC transmission dip is observed. The DSM Fermi level and the configuration of resonators also affect the BIC resonance, with the Fermi level significantly influencing the resonance and modifying the configuration causing additional transmission dips.
Article
Optics
Yonggang Zhang, Fu Qiu, Lanju Liang, Haiyun Yao, Xin Yan, Wenjia Liu, Chengcheng Huang, Jianquan Yao
Summary: This letter presents a fabricated Dirac point modulator of a graphene-based terahertz electromagnetically induced transparency (EIT)-like metasurface. The modulation is achieved through three stimulus modes: optical pump, bias voltage, and optical pump-bias voltage combination. The position of the Dirac point can be evaluated approximately by analyzing the transmission spectrum fluctuation. The findings demonstrate a method for designing ultrasensitive terahertz modulation devices.
Article
Materials Science, Multidisciplinary
Furu Zhang, Yang Gao, Wei Zhang
Summary: Our systematic studies on the topological aspects of plasmons of Weyl semimetals in the presence of a magnetic field have revealed two types of three-dimensional topological plasmons and proposed the existence of surface/edge plasmons that can be controlled by external fields. Additionally, the anomalous Hall conductivity leads to abundant anisotropic plasmon dispersions.
Article
Optics
Jipeng Wu, Jie Tang, Rongzhou Zeng, Xiaoyu Dai, Yuanjiang Xiang
Summary: Through investigating the phenomenon of coherent perfect absorption (CPA) with bulk Dirac semimetal (BDS) thin film, it is found that CPA can be achieved under different polarizations and incidence circumstances, and its frequency and dynamic regulation can be adjusted by changing the thickness of the thin film and Fermi energy.
CHINESE OPTICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Ben-Xin Wang, Guiyuan Duan, Chongyang Xu, Jieying Jiang, Wei Xu, Fuwei Pi
Summary: This paper presents a multiple-frequency-band terahertz metamaterial absorber using the surface structure of a toothed resonator. It is capable of controlling the number of absorption peaks without increasing design complexity, unlike previous works. Moreover, the introduction of temperature-controlled vanadium dioxide allows for dynamic tuning of its resonance performance.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Physical
Fei Zhao, Jiangchuan Lin, Zhenhua Lei, Zao Yi, Feng Qin, Jianguo Zhang, Li Liu, Xianwen Wu, Wenxing Yang, Pinghui Wu
Summary: In this work, the performance of c-Si/ZnO heterojunction ultrathin-film solar cells is enhanced by an integrated structure of c-Si trapezoidal pyramids on the top and Al pyramids in the active layer. The top c-Si pyramid increases absorption of short wavelengths and the bottom Al pyramid improves overall optical absorption, resulting in a high absorption rate of 93.16%. The optimized current density and conversion efficiency of the solar cells are 41.94 mA cm(-2) and 18.97%, respectively. The solar cells show good absorption in a wide range of incident angles and the electric field intensity profile demonstrates excellent light-trapping performance.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Zhipeng Zheng, Ying Zheng, Yao Luo, Zao Yi, Jianguo Zhang, Zhimin Liu, Wenxing Yang, Yang Yu, Xianwen Wu, Pinghui Wu
Summary: This study proposes a terahertz metamaterial absorber that combines metamaterial structures and a VO2 film. Flexible switching of absorption performance and an ultra-broadband perfect absorption with a bandwidth of 3.3 THz can be achieved through temperature adjustment. The study also highlights the wide thermal tuning range of spectral absorbance.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Optics
Ying Zheng, Pinghui Wu, Hua Yang, Zao Yi, Yao Luo, Li Liu, Qianjv Song, Miao Pan, Jianguo Zhang, Pinggen Cai
Summary: In this paper, an efficient and ultra-broadband solar absorber composed of a periodic nano-disk combination array on a TiO2 thin film is proposed. The absorber exhibits high absorption efficiency, broad absorption bandwidth, strong heat radiation intensity, and polarization independence, making it suitable for thermo-photovoltaics and other high-power optoelectronic applications.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Chunlian Cen, Yijun Tang, Yao Luo, Ying Zheng, Jianguo Zhang, Liying Jiang, Zhiyou Li, Pinghui Wu, Ronghua Jian, Zao Yi
Summary: In this paper, the authors use critical coupling theory analysis and FDTD method to investigate the absorption characteristics of the graphene-cylinder-metal arrays structure in the near-infrared region. The results show that the structure exhibits high-sensitivity and polarization-independent perfect absorption, which has potential applications in photonics and optoelectronic devices.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Cai Zhang, Yongheng Chen, Hua Yang, Shifa Wang, Feng Qin, Li Liu, Zao Yi, Jianguo Zhang, Chao Liu, Pinghui Wu
Summary: We designed a broadband absorber based on gallium arsenide and titanium, which achieved over 90% absorption efficiency in the infrared range and maintained good absorption under various incident angles. This absorber is expected to find wide applications in infrared detection, optical sensing, and thermal electronics.
Article
Materials Science, Multidisciplinary
Hongyu Ren, Qianyi Shangguan, Zijun Song, Yong Zhao, Zao Yi, Guolu Ma, Jianguo Zhang, Hua Yang, Shifa Wang, Pinghui Wu
Summary: This paper presents a graphene metamaterial absorber based on impedance matching, which achieves a theoretically perfect absorption in the mid-infrared band. The designed absorber is capable of multiband stable high absorption and maintains excellent performance in a wide incident angle range. The results indicate that the graphene absorber has potential applications in biosensing, photodetection, and photocell fields.
Article
Materials Science, Multidisciplinary
Zijun Song, Guolu Ma, Zao Yi, Jianguo Zhang, Yong Zhao
Summary: Metamaterials are artificial materials with special properties that can acquire unique electromagnetic field properties due to its unique geometry and small size. The designed solar absorber can absorb over 90% of the electromagnetic waves in a wide range of wavelengths, and it performs well under different incident angles.
Article
Materials Science, Multidisciplinary
Lirong Wang, Yingting Yi, Zao Yi, Liang Bian, Jianguo Zhang, Hua Yang, Jing Chen, Pinghui Wu, Hailiang Li, Chaojun Tang
Summary: This article investigates and proposes a triple-band ultra-perfect absorber based on graphene surface plasmon resonance. By using the finite difference time domain (FDTD) method, three perfect absorption peaks in the mid-infrared wavelength range are identified. The paper shows that the absorption peak can be controlled by changing the Fermi energy level and relaxation time of graphene, and the absorbed resonant waves can also be controlled by adjusting the refractive index of the environment and SiO2. The absorber exhibits polarisation and angle insensitivity, maintaining high absorption for different incident angles. The simulations reveal three resonance absorption peaks with sensitivities, indicating the potential value of the absorber in various applications.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Thermodynamics
Feng Qin, Feng Xu, Jiangwei Liu, Pengfei Hu, Zao Yi, Li Liu, Hua Yang, Jianguo Zhang, Miao Pan, Pinghui Wu
Summary: This study proposes a laminated cubic solar absorber with double metal-dielectric layers, which demonstrates high absorption and heat conversion efficiency, making it suitable for various applications in photothermal conversion and thermal emitters.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Optics
Xianglong Wu, Wenchao Zhao, Zao Yi, Jiaxin Yu, Zigang Zhou, Hua Yang, Shifa Wang, Jianguo Zhang, Miao Pan, Pinghui Wu
Summary: This study combines two tunable metamaterials, vanadium oxide (VO2) and Dirac semimetal thin films (DSF), to design a tunable multi-band narrowband absorber with on-off switching function. The absorber has three perfect absorption peaks with absorptivity greater than 97% when VO2 is in metallic state. By lowering the temperature, VO2 can be transformed into an insulating state, which greatly reduces the absorption rate of the absorber and realizes the change of the state of the absorber. By changing the Fermi level (EF) of the DSF, the resonant frequency of the absorber is tunable up to 0.444 THz while maintaining the absorption rate above 90%.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Physical
Wanlai Zhu, Yingting Yi, Zao Yi, Liang Bian, Hua Yang, Jianguo Zhang, Yang Yu, Chao Liu, Gongfa Li, Xianwen Wu
Summary: To improve optical fiber sensing performance and broaden its application, a photonic crystal fiber (PCF) plasmonic sensor with a U-shaped channel based on surface plasmon resonance (SPR) is proposed in this study. The influence rules of structural parameters, such as the radius of the air hole, the thickness of the gold film, and the number of U-shaped channels, were investigated using COMSOL and the finite element method. The dispersion curves, loss spectrum, and electric field intensity distribution were studied under various conditions. The proposed sensor achieved a maximum refractive index sensitivity of 24.1 mu m RIU-1 in the RI range of 1.38-1.43, with a FWHM of 10.0 nm, a FOM of 2410 RIU-1, and a resolution of 4.15 x 10(-6) RIU. The sensor combines the highly sensitive SPR effect and allows for real-time detection of the external environment. The detection range and sensitivity can be increased by adjusting the structural parameters. The sensor has a simple structure and excellent performance, providing a new approach for real-time detection and highly integrated sensing.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Analytical
Runing Lai, Hao Chen, Zigang Zhou, Zao Yi, Bin Tang, Jing Chen, Yougen Yi, Chaojun Tang, Jianguo Zhang, Tangyou Sun
Summary: This paper introduces a new theoretical proposal for a surface plasmon resonance terahertz metamaterial absorber with five narrow absorption peaks. By controlling the properties of graphene, the absorption rates and frequencies can be dynamically adjusted. The design features dynamic tunability, wide absorption characteristics, and excellent sensitivity.
Article
Chemistry, Physical
Wenxin Li, Jing Ma, Huafeng Zhang, Shubo Cheng, Wenxing Yang, Zao Yi, Hua Yang, Jianguo Zhang, Xianwen Wu, Pinghui Wu
Summary: In this research, a tunable broadband absorber based on a layered resonant structure was designed, which achieved high absorption (more than 0.9) in the frequency range of 18-28 THz. The high absorption was attributed to strong resonance absorption between the layers and the resonance of the localised surface plasmon. The absorber, consisting of three layers of Dirac semimetal and three layers of optical crystal plates on a gold substrate, also showed tunability and absorption stability.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Xingyu Wang, Jiangchuan Lin, Zhiyang Yan, Zao Yi, Jiaxin Yu, Wei Zhang, Feng Qin, Xianwen Wu, Jianguo Zhang, Pinghui Wu
Summary: This paper proposes a tunable sensing detector based on Bulk Dirac semimetals, which can realize frequency regulation and multi-frequency controllable sensing by adjusting the Fermi level of the semimetals. The detector exhibits high absorption rate, angular insensitivity, and high sensitivity, making it important for applications such as space detection and high-sensitivity biosensing detection.
Article
Chemistry, Physical
Zhipeng Zheng, Yao Luo, Hua Yang, Zao Yi, Jianguo Zhang, Qianjv Song, Wenxing Yang, Chao Liu, Xianwen Wu, Pinghui Wu
Summary: A novel and structurally simple multifunctional broadband absorber is presented, using the thermogenic phase change properties of vanadium dioxide material to flexibly adjust absorption intensity and achieve near-perfect absorption in an ultra-broadband range.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Spyridon G. Kosionis, Emmanuel Paspalakis
Summary: In this study, we theoretically investigate the pump-probe response and the four-wave mixing spectrum in a hybrid system composed of a semiconductor quantum dot and a spherical metal nanoparticle. Using a density matrix methodology, we calculate the absorption/gain, dispersion, and four-wave mixing spectra, and analyze their spectral characteristics. We also apply the metastate theory and the dressed-state picture to predict the positions of the spectral resonances.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
L. S. Lima
Summary: This study investigates quantum correlation and entanglement in the non-Hermitian Hubbard model. By analyzing quantum entanglement measures such as entanglement negativity and entropy, the effect of non-Hermitian imaginary hopping on the system is explored. It is found that in the large... limit, the non-Hermiticity reverses the behavior of the ground state energy and low-lying excitations.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Nam-Chol Ri, Chung-Sim Kim, Sang-Ryol Ri, Su-Il Ri
Summary: By decreasing the lattice thermal conductivity of GNR through chemical derivation and strain, enhancing the thermoelectric properties of the electron part can be an important method to approach PGEC. This paper proposes synthesized hybrid systems formed by chemical derivation in the middle parts of b-AGNRs, and investigates the band structures and thermoelectric properties of the electron part under different strains. The results show that the band gaps of the systems significantly increase under different strains.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Le T. T. Phuong, Tran Cong Phong
Summary: This study investigates the effects of gas molecules adsorbed on /312-borophene on its electronic heat capacity and thermal Schottky anomaly. The results show that the adsorbed gas molecules have different impacts on the electronic heat capacity, leading to the generation of various new energy levels.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Tianyan Jiang, Jie Fang, Wentao Zhang, Maoqiang Bi, Xi Chen, Junsheng Chen
Summary: This paper investigates the adsorption and sensing properties of transition metal-doped WSSe gas-sensitive devices towards H2, CO, and CO2 gases related to thermal runaway in Li-ion batteries using density functional theory. The results show that Ti, Mn, and Mo dopants preferentially bind to the S-surface of the WSSe monolayer, and all three monolayers exhibit significantly improved sensing characteristics, with chemisorption towards CO. Band structure analysis suggests that the Ti-WSSe monolayer has the potential to be used as a resistive CO detection sensor. Recovery time calculations indicate the reuse capabilities of the gas-sensitive devices. Mn-WSSe monolayer shows potential for H2 detection, while Mo-WSSe monolayer is more suitable for CO2 detection. This work lays the foundation for potential gas-sensitive applications of WSSe monolayer in thermal runaway scenarios, advancing research in gas sensing domains.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Olga A. Alekseeva, Aleksandr A. Naberezhnov, Ekaterina Yu. Koroleva, Aleksandr Fokin
Summary: This study investigates the temperature dependence of crystal structure and dielectric response in a nanocomposite material containing porous glasses and embedded sodium nitrate. The results reveal a crossover point in the temperature dependence of the order parameter of the structural transition in sodium nitrate nanoparticles, as well as a decrease in activation energy of sodium ions hopping conductivity during heating.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Lijun Cheng, Fang Cheng
Summary: This paper investigates the effects of electric and magnetic fields on the Goos-Hanchen (GH) shift in a semi-Dirac system. The results show that the magnitude and direction of the GH shift depend on various factors such as incidence angle, electric barrier height and width, and magnetic field. It is observed that there is a saltus step in GH shifts at the critical magnetic field, which decreases with increased potential barrier thickness. Additionally, the GH shift can be significantly enhanced by applying an electric field in the III region. These findings are important for the development of semi-Dirac based electronic devices.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Alexander K. Fedotov, Uladzislaw E. Gumiennik, Julia A. Fedotova, Janusz Przewoznik, Czeslaw Kapusta
Summary: The study conducted an improved analysis of carrier transport in single-layer graphene and hybrid structures, showing the coexistence of negative and positive contributions in magnetoresistive effect. Various models were used to analyze the dependences on temperature and magnetic field, providing insights into the behavior of electrical resistance in the structures.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Xuhui Peng, Tao Chen, Ruotong Chen, Shizheng Chen, Qing Zhao, Xiaoping Huang
Summary: In this study, a novel method was proposed to design and fabricate optoelectronic devices with highly precise controlled photorefractive liquid crystal structures. By utilizing quantum dots and electric tuning, a regular periodic grating was formed in a quantum dot-doped liquid crystal volume illuminated by a laser standing evanescent wave field. The obtained optical diffraction pattern showed equally spaced light spots and high diffraction efficiency, indicating a significant change in the refractive index of the nanostructured device.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Kai-Hua Yang, Xiao-Hui Liang, Huai-Yu Wang, Yi-Fan Wu, Qian-Qian Yang
Summary: In this work, a theoretical model is proposed to achieve the controllability of quantum interference and decoherence. The effects of intralead Coulomb interaction, interdot tunneling, and electron-phonon interactions on differential conductance are investigated. The results show the appearance of destructive interference, Fano interference, and negative differential conductance in strong dot-lead tunneling regions, while a characteristic pattern of positive and negative differential conductances appears in the weak dot-lead tunneling regime.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Xueying Wang, Qian Ma, Qi Zhang, Yi Wang, Lingyu Li, Dongheng Zhao, Zhiqiang Liu
Summary: Porous double-channel alpha-Fe2O3/SnO2 heterostructures with tunable surface/interface transport mechanism were successfully fabricated by electrospinning and calcination. These heterostructures exhibited a large specific surface area, providing more active sites and enhanced adsorption capacity. The optimal composite materials showed the highest response value and the fastest response/recovery times to DMF, along with good cycling performance, long-term stability, and high gas selectivity.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Donglin Guo, Zhengmeng Xu, Chunhong Li, Kejian Li, Bin Shao, Xianfu Luo, Jianchun Sun, Yilong Ma
Summary: Using full electron-phonon interactions and the Boltzmann transport equation, this study investigates the phonon scattering channel and electrical properties of graphene under anharmonic phonon renormalization (APRN). The results show that the APRN reduces the phonon frequency and three-phonon phase space with increasing temperature, affecting the acoustic branch more than the optical branch. The thermal conductivity of graphene decreases after considering three- and four-phonon scattering, and the primary scattering channels are identified. Furthermore, the APRN increases the strength of electron-phonon coupling and leads to an increase in n-type electric resistance at room temperature.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Hongping Zhao, Man Zhao, Dayong Jiang
Summary: The study proposes a broadband photodetector with high response, high sensitivity, and controllable band by integrating quantum dots and highly conductive materials. The PD composed of ZnO film/PbS quantum dots heterostructure shows excellent photoresponse performance in the UV-Vis-NIR range, with the peak responsivity increased by 550%, accompanied by significant red shift, faster response, and recovery speed. By using RF magnetron sputtering to prepare ultra-thin ZnO film, the impact of PbS quantum dots on the photoelectric properties of ZnO film is comprehensively and systematically discussed.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Ye Xuan Meng, Liwei Jiang, Yisong Zheng
Summary: Manipulating magnetism by electrical means is an effective method for realizing ultra-low power spintronic-integrated circuits. In this study, it is demonstrated that the two-dimensional semiconductor material InO monolayer can be tuned to a half-metallic state by applying a gate voltage, providing theoretical guidance for adjusting two-dimensional magnetic semiconductors.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Anusha Kachu, Aalu Boda
Summary: In this research, we investigated the impact of confinement nature on a neutral hydrogenic donor impurity in a quantum dot. The study demonstrated intriguing behavior in response to changes in potential shape, quantum dot parameters, and spin-orbit coupling strengths. The findings provide valuable insights into the fundamental physics of quantum dots and impurities and can aid in the design and optimization of QD-based technologies.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
