Article
Chemistry, Multidisciplinary
Yoon Seong Heo, Tae Wan Kim, Wooseok Lee, Jungseok Choi, Soyeon Park, Dong-Il Yeom, Jae-Ung Lee
Summary: Investigations on mesoscopic-scale stacking reconfigurations and their correlations with mechanical distortions are conducted in stacked van der Waals films. It is found that the distortions come from the transfer process or the extended impact of atomic reconstructions. Grain boundaries have a limited effect, while cracks cause inhomogeneous strain in stacked polycrystalline films.
Article
Chemistry, Multidisciplinary
Hwiin Ju, Youjin Lee, Kwang-Tak Kim, In Hyeok Choi, Chang Jae Roh, Suhan Son, Pyeongjae Park, Jae Ha Kim, Taek Sun Jung, Jae Hoon Kim, Kee Hoon Kim, Je-Geun Park, Jong Seok Lee
Summary: This study reveals the possible existence of a multiferroic state with coexisting antiferromagnetic and ferroelectric orders in bilayer flakes of Nil, with a transition temperature of about 20 K. The magnitude and direction of the ferroelectric order arising from the cycloidal spin order were successfully traced using optical second-harmonic generation technique. This observation will inspire extensive efforts to demonstrate multifunctionality in vdW materials, which have been largely explored using heterostructures of singly ferroic materials.
Article
Materials Science, Multidisciplinary
Pilkyung Moon
Summary: We investigate the electronic structures of chiral twisted van der Waals atomic layers, focusing on chiral twisted graphite (CTG), and find that each CTG can host infinitely many resonant states with screw rotational symmetry and reduced Brillouin zone; regardless of the twist angle, the energies and wave functions of the resonant states can be described in a universal form of a one-dimensional chain, exhibiting a clear optical selection rule for circularly polarized light.
Review
Chemistry, Physical
Jiaojiao Ma, Kaiwen Guan, Yu Jiang, Yang Cao, Sheng Hu
Summary: Research on two-dimensional materials has provided insights into the low-dimensional science and the investigation of physical and chemical processes under two-dimensional confinement. The discoveries in this field have expanded our understanding of nano-science and stimulated the development of potential applications.
Article
Chemistry, Multidisciplinary
Fei Yang, Chao Li, Jiling Li, Pu Liu, Guowei Yang
Summary: Based on the research presented, the structure and synthesis of carbyne nanocrystals have been revealed, confirming them as one-dimensional van der Waals crystals. This discovery expands the understanding of the third form of carbon and opens up new avenues for exploration in the field of carbon materials research.
Article
Chemistry, Multidisciplinary
Lijuan Niu, Yuyin Li, Mei Zhao, Zhenjing Liu, Mengjia Zhang, Changchun Ding, Zhenjun Dou, Yihong She, Kenan Zhang, Zhengtang Luo, Lijie Zhang, Shun Wang
Summary: This study reports a van der Waals template-assisted growth method for 2D crystals, which reduces the growth temperature by up to 35% compared to traditional vapor deposition. The low-temperature growth process is attributed to the low surface diffusion barrier of precursors on van der Waals surfaces. Additionally, the grown 2D crystals can be easily peeled off and transferred to other substrates for applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Review
Chemistry, Inorganic & Nuclear
Wei Zheng, Xianghong Liu, Jiayue Xie, Guocai Lu, Jun Zhang
Summary: The article provides a comprehensive overview of the design and application of vdW junctions based on W and Mo-TMDs materials for gas sensors, discussing methods for constructing different forms of vdW heterojunctions and summarizing the latest advances and future challenges in their application in chemical gas sensors.
COORDINATION CHEMISTRY REVIEWS
(2021)
Review
Chemistry, Multidisciplinary
Xiangdong Guo, Wei Lyu, Tinghan Chen, Yang Luo, Chenchen Wu, Bei Yang, Zhipei Sun, F. Javier Garcia de Abajo, Xiaoxia Yang, Qing Dai
Summary: 2D monolayers can be vertically stacked in van der Waals heterostructures to support a wide range of confined polaritons. This offers advantages in terms of controlling the constituent layers, stacking sequence, and twist angles. These heterostructures have extended the performance and functions of polaritons, and potential applications include nanophotonic integrated circuits.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Flavia Pennini, Angel Plastino
Summary: We undertake a van der Waals inquiry at very low temperatures and explore its relationship with the van der Waals gas-liquid transition. By using novel thermal statistical quantifiers, we gain fruitful insights.
Article
Multidisciplinary Sciences
A. J. Sternbach, S. H. Chae, S. Latini, A. A. Rikhter, Y. Shao, B. Li, D. Rhodes, B. Kim, P. J. Schuck, X. Xu, X-Y Zhu, R. D. Averitt, J. Hone, M. M. Fogler, A. Rubio, D. N. Basov
Summary: Layered crystals, such as tungsten diselenide, can exhibit unconventional optical properties that allow for the propagation of subdiffractional waveguide modes with hyperbolic dispersion. This study demonstrates optically induced hyperbolicity in WSe2 and explores the role of quantum transitions of excitons in the observed polaritonic response.
Article
Chemistry, Multidisciplinary
Ning Xu, Xudong Pei, Lipeng Qiu, Li Zhan, Peng Wang, Yi Shi, Songlin Li
Summary: This study reports the observation of the energy funnelling effect and ambient photodelamination phenomenon in few-layer WS2 flakes under low-illumination fluencies, which suggests that photodelamination can be used as a noninvasive atomic-layer etching strategy for selectively removing excessive overlying islands.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yue Zhao, Gang Wu, Kuan-Ming Hung, Jiung Cho, Miri Choi, Cormac O. Coileain, Georg S. Duesberg, Xiang-Kui Ren, Ching-Ray Chang, Han-Chun Wu
Summary: In this work, we fabricated field effect transistor gas sensors based on mechanically exfoliated van der Waals (vdW) layered materials and investigated their electrical field-dependent gas sensing properties. The results showed good agreement between experimental and theoretical values, indicating the validity of the Langmuir absorption model for vdW materials. Additionally, we demonstrated that the device sensing behavior strongly depends on carrier availability, leading to giant sensitivities and strong selectivity at the sensitivity singularity. Furthermore, our study revealed that these features can be utilized to quickly detect and differentiate low concentrations of mixed hazardous gases using sensor arrays.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Multidisciplinary
Hui-Lei Hou, Cosimo Anichini, Paolo Samori, Alejandro Criado, Maurizio Prato
Summary: In the past 15 years, 2D materials have revolutionized materials science and become powerful components for high-performance chemical sensors. By forming van der Waals heterostructures (VDWHs), the individual drawbacks of 2D materials can be overcome, leading to superior sensitivities, selectivity, and stability. This review discusses the latest developments in chemical sensors based on VDWHs of 2D materials, including sensing mechanisms and future directions with potential impact in environmental sciences and biomedical applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Analytical
Liwei Liu, Ning Sheng Xu, Yanlin Ke, Huanjun Chen, Yu Zhang, Shaozhi Deng
Summary: A new sensing principle based on the change of surface work function induced by various impacts has been proposed and demonstrated. Gas sensing devices using van der Waals stacked 2D atomic crystals have been fabricated to detect NH3 and NO2 gases selectively. The devices show superior sensing performances in terms of sensitivity, power dissipation, response and recovery time.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Review
Chemistry, Multidisciplinary
Fang Wang, Tao Zhang, Runzhang Xie, Anna Liu, Fuxing Dai, Yue Chen, Tengfei Xu, Hailu Wang, Zhen Wang, Lei Liao, Jianlu Wang, Peng Zhou, Weida Hu
Summary: With the continuous advancement of nanofabrication techniques and the discovery of useful manipulation mechanisms in high-performance applications, the morphology and usage of junction devices in photodetectors have undergone fundamental revolution. New types of photodetectors, not relying on any junction, have emerged, offering high signal-to-noise ratio and multidimensional modulation. This review focuses on a unique category of material systems, van der Waals materials, which support novel high-performance photodetectors beyond junctions.
ADVANCED MATERIALS
(2023)
Article
Astronomy & Astrophysics
A. Almodlej, H. Alrashed, N. Ben Nessib, M. S. Dimitrijevic
Summary: The researchers calculated energy levels, oscillator strengths, and transition probabilities for eight carbon-like ions using different methods and compared the results with experimental data, providing useful information for plasma diagnostics and modeling.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Rafik Hamdi, Nabil Ben Nessib, Sylvie Sahal-Brechot, Milan S. Dimitrijevic
Summary: Stark widths and shifts have been calculated for 17 ultraviolet lines of Fe V of astrophysical interest. The study highlights the importance of electron impact broadening in plasma conditions of hot DA white dwarfs, compared against Doppler width.
ASTRONOMISCHE NACHRICHTEN
(2022)
Article
Astronomy & Astrophysics
Milan S. Dimitrijevic, Magdalena D. Christova, Sylvie Sahal-Brechot
Summary: In this study, the widths and shifts due to collisions with electrons, protons, and He II ions for 66 multiplets of neutral boron were calculated using the semiclassical perturbation theory. The temperature range was from 2500 to 50000 K and the electron density values ranged from 10^11 to 10^19 cm^-3. The obtained Stark broadening parameters were compared to other theoretical and experimental results for validation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Milan S. Dimitrijevi, Magdalena D. Christova, Cristina Yubero, Sylvie Sahal-Brechot
Summary: Stark broadening parameters, full widths at half-maximum and shifts for 18 spectral lines of Fe XXV, broadened by collisions with electrons, protons and Fe XXVII ions, are calculated using the impact semiclassical perturbation formalism for various electron densities and temperatures relevant to neutron star atmospheres and their environment.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Milan S. Dimitrijevic, Magdalena D. Christova
Summary: Stark widths for spectral lines of Zn III singlets and triplets have been calculated, and the results are used to understand the influence of Stark broadening on Zn III spectral lines in stellar atmospheres and to analyze Stark width similarities within supermultiplets and transition arrays.
Article
Astronomy & Astrophysics
V. A. Sreckovic, L. M. Ignjatovic, M. S. Dimitrijevic
Summary: This study investigates electron-impact processes involving hydrogen, lithium, and sodium molecular cations, and reports rate coefficients for dissociative recombination in the domains of principal quantum numbers n >= 4, and temperatures ranging from 500K to 10,000K. These findings have implications for modeling the kinetics of the Early Universe and studying geocosmical plasmas.
CONTRIBUTIONS OF THE ASTRONOMICAL OBSERVATORY SKALNATE PLESO
(2022)
Article
Astronomy & Astrophysics
M. S. Dimitrijevic, M. D. Christova, S. Sahal-Brechot
Summary: The Stark broadening parameters, line widths, and shifts of spectral lines within Fe XXV 3s2SJ-3p2PoJ multiplet were calculated using the impact semiclassical perturbation theory. The results show that despite differences in line width values expressed in A, they are practically the same when expressed in angular frequency units. This study demonstrates the significance of using known Stark broadening parameters for Fe XXV spectral lines to determine unknown parameters for other lines in the same multiplet, which is important for neutron star atmospheres, environment investigation, modeling, and inertial fusion plasma.
CONTRIBUTIONS OF THE ASTRONOMICAL OBSERVATORY SKALNATE PLESO
(2022)
Article
Astronomy & Astrophysics
M. S. Dimitrijevi, M. D. Christova, S. Sahal-Brechot
Summary: This study compares the calculated Stark broadening parameters of Si II spectral lines using impact semiclassical perturbation theory with experimental data from literature. The presented data are crucial for evaluating the physical conditions of stellar plasma, determining silicon abundance, calculating opacity, analyzing and synthesizing stellar spectra, and modeling stellar atmospheres.
CONTRIBUTIONS OF THE ASTRONOMICAL OBSERVATORY SKALNATE PLESO
(2022)
Article
Optics
Arturs Cinins, Milan S. Dimitrijevic, Vladimir A. Sreckovic, Kaspars Miculis, Nikolai N. Bezuglov
Summary: The study explores nontraditional mathematical approaches to analyze nonlocalized population transfer between quantum levels. The focus is on analyzing irremovable nonadiabatic transitions in completely degenerate dark states of N-pod systems. By considering the quantum dynamics of dark states in terms of Riemannian parallel transport, which is the geometric counterpart in the space of control parameters, the research establishes a strong link between quantum and geometric approaches. The findings, illustrated through mathematical modeling of nonadiabatic effects in four-level systems interacting with three laser fields (tripod systems), have implications for experimental plasma research and atomic and laser physics.
EUROPEAN PHYSICAL JOURNAL D
(2023)
Article
Astronomy & Astrophysics
H. Elabidi, S. Sahal-Brechot, M. S. Dimitrijevic, R. Hamdi, W. Belhadj
Summary: In this paper, new quantum Half Widths at Half intensity Maximum (HWHM) for 101 spectral lines of different ions were presented and compared to new experimental results. The discrepancies found between the new measurements and available theoretical calculations suggest the importance of these quantum calculations. The obtained results have various applications such as abundance determination, stellar opacity calculation, interpretation and modeling of stellar spectra, and estimation of transfer through stellar plasmas.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
H. Elabidi, S. Sahal-Brechot, M. S. Dimitrijevic, W. Belhadj, R. Hamdi
Summary: This paper presents new Stark broadening parameters for Ga IV, Ga V, Ge IV, and Ge V ions. The calculations were performed using a quantum mechanical method. Only the Stark broadening results for Ge IV ion were available, obtained through semiclassical perturbation and modified semi-empirical methods. For the other three ions, no data have been found. Theoretical evaluations and measurements of atomic and Stark broadening data play a crucial role in stellar atmosphere modeling.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Physics, Fluids & Plasmas
F. J. Morales-Calero, R. Rincon, J. Munoz, M. D. Calzada
Summary: The TIAGO torch, a type of microwave-induced plasma, has attracted technological and scientific interest due to its exceptional performance. Although experimental verification is lacking, it is theoretically predicted that the TIAGO torch produces surface wave discharges, which have the potential to advance material development. Thus, further research is needed to optimize the implementation of plasma technology in fields such as green energy and graphene production.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Astronomy & Astrophysics
Milan S. S. Dimitrijevic, Magdalena D. D. Christova
Summary: Stark widths for 23 transitions in Al IV have been calculated using the modified semiempirical method, considering an electron density of 10(17) cm(-3) and temperatures ranging from 10,000 K to 160,000 K. The obtained results are used to study the influence of Stark broadening in Al IV stellar spectra, as well as to analyze the regular behavior and similarities of Stark widths within the Al IV spectrum.
Article
Astronomy & Astrophysics
Walid F. Mahmoudi, Abu El Maati, Ben Nessib, Sylvie Sahal-Brechot, Milan S. Dimitrijevic
Summary: This work focuses on studying the Stark widths of Ariv ion, and presents a calculation method. The accuracy of the method is validated by comparing the calculated results with experimental data.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Computer Science, Information Systems
Vladimir A. Sreckovic, Ljubinko M. Ignjatovic, Aleksandra Kolarski, Zoran R. Mijic, Milan S. Dimitrijevic, Veljko Vujcic
Summary: The photodissociation data of small molecular ions were reported and studied using a quantum mechanical method. The influence of temperature and wavelength on the spectral coefficients data of all investigated species were discussed. These data could be useful for plasma diagnostics, astrophysics, and industrial plasma modeling.
Article
Spectroscopy
Piyali Deb Barman, Ashok Kumar Maurya, Subhendu Ghosh, Ankit Roy, Mukul Madaan
Summary: In X-ray spectroscopic studies, K beta 1,3 lines have been used to examine the chemical states of 3d transition metals, but are not suitable for characterizing iron oxides. Instead, FeL-lines, which involve the valence shell 3d electrons, were inspected and found to provide information on the chemical states of iron. The study established a linear relationship between the chemical shift of FeL beta 1 line and spin multiplicity, allowing for the speciation of iron.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2024)
