Article
Physics, Applied
H. Y. Poh, C. C. I. Ang, T. L. Jin, F. N. Tan, G. J. Lim, S. Wu, F. Poh, W. S. Lew
Summary: This study presents a lithography-free technique for characterizing spin-orbit torque efficiency in a perpendicular magnetic anisotropy ferromagnetic heterostructure using a customized four-point probe and harmonic Hall measurement on continuous films. A correction factor is evaluated experimentally and analytically, independent of material, by comparing damping-like fields of continuous film to a fabricated Hall device. The calibration process can be applied to other ferromagnetic heterostructures, offering a swift alternative to traditional lithography processes.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Adil Rehman, Juan Antonio Delgado Notario, Juan Salvador Sanchez, Yahya Moubarak Meziani, Grzegorz Cywinski, Wojciech Knap, Alexander A. Balandin, Michael Levinshtein, Sergey Rumyantsev
Summary: This study demonstrates that mobility fluctuations are the dominant mechanism of low-frequency electronic noise in high-quality graphene, providing important insights for its applications in electronics and understanding the origin of 1/f noise in any electronic device.
Article
Chemistry, Multidisciplinary
Ayelet Zalic, Takashi Taniguchi, Kenji Watanabe, Snir Gazit, Hadar Steinberg
Summary: In this work, a novel atomically thin, all van der Waals SQUID is constructed, in which current flows between NbSe2 contacts through parallel graphene weak links. The 2D planar SQUID remains stable at high in-plane fields, enabling the tracing of critical current interference patterns and the observation of a field-driven transition. The asymmetric SQUID geometry is further suggested for directly probing current density in the absence of phase information.
Article
Physics, Multidisciplinary
Masahiro Kamada, Weijun Zeng, Antti Laitinen, Jayanta Sarkar, Sheng-Shiuan Yeh, Kirsi Tappura, Heikki Seppa, Pertti Hakonen
Summary: The authors investigate the sources of 1/f noise using a suspended graphene Corbino device and provide evidence that mobility fluctuations are an essential contributing factor. The work shows that the noise can be suppressed in a high-mobility graphene Corbino disk, indicating potential technological benefits for low noise 2D devices. The results suggest that the 1/f noise is induced by scattering of carriers on mobile impurities forming clusters.
COMMUNICATIONS PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Ke Wang, M. E. Raikh, T. A. Sedrakyan
Summary: The study shows that the opposite chiralities of Dirac electrons in graphene significantly modify the Friedel oscillations, with a weak uniform magnetic field having an anomalous effect on the oscillations. This field-dependent contribution in a large spatial interval does not decay with distance, originating from a spin-dependent magnetic phase accumulated by the electron propagator.
Article
Multidisciplinary Sciences
Dong-Ho Kang, Hao Sun, Manlin Luo, Kunze Lu, Melvina Chen, Youngmin Kim, Yongduck Jung, Xuejiao Gao, Samuel Jior Parluhutan, Junyu Ge, See Wee Koh, David Giovanni, Tze Chien Sum, Qi Jie Wang, Hong Li, Donguk Nam
Summary: The study demonstrates that pseudo-magnetic fields in periodically strained graphene can slow down carrier dynamics. Furthermore, it is found that strong pseudo-magnetic fields created by non-uniform strain in graphene can significantly decelerate the relaxation processes of hot carriers. These findings provide alternative opportunities to utilize graphene properties enabled by pseudo-magnetic fields in optoelectronics and condensed matter physics.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Fluids & Plasmas
E. Kh Alpomishev, G. G. Adamian, N. Antonenko
Summary: The study investigates the non-Markovian dynamics of a charged particle confined in a harmonic oscillator and coupled to a neutral bosonic heat bath in an external uniform magnetic field, deriving analytical expressions for time-dependent and asymptotic orbital angular momenta. Transitions from non-Markovian to Markovian dynamics and from confined to free charge particles are considered, along with the orbital diamagnetism of graphene under dissipative conditions and an external uniform magnetic field, comparing results with experimental data. Results are presented for the electric conductivity and resonance behavior of mass magnetization in graphene.
Article
Chemistry, Multidisciplinary
Sergio de-la-Huerta-Sainz, Angel Ballesteros, Nicolas A. Cordero
Summary: In this study, the mechanical and electronic properties of bent hexagonal graphene quantum dots were investigated using density functional theory. A strong correlation between Gaussian curvature and quantum regeneration times was found, and a special divergence was observed for the revival time in the hyperboloid case, possibly due to the pseudo-magnetic field generated by this curvature causing a phase transition.
Article
Chemistry, Physical
Fang Zhao, Yevgeny Raitses, Xiaofang Yang, Andi Tan, Christopher G. Tully
Summary: Chemical functionalization of two-dimensional materials, such as graphene, is an effective method for tailoring their properties, with potential applications in energy, catalysis, and electronics. A promising plasma-based method has been developed to provide high hydrogen coverage on graphene, demonstrating higher coverage than previous results and showing potential for diverse applications. The use of radial electric and axial magnetic fields in low-pressure discharge generates a fine-tunable low-temperature hydrogen-rich plasma with enhanced hydrogen density, paving the way for further research and technological advancements in this field.
Review
Chemistry, Applied
Tao Bai, Xiaolin Liu
Summary: In this study, magnetized graphene oxide (MGO) was prepared by bonding graphene oxide (GO) and Fe3O4. The MGO was characterized and used to prepare MGO/WPU nanocomposite coatings, which exhibited improved tribological properties under different magnetic field intensities. The magnetic field promoted the formation of a stable transfer film and enhanced its adhesion.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Chemistry, Physical
Takeshi Miyata, Syun Gohda, Takashi Fujii, Hironobu Ono, Hibiki Itoh, Yuta Nishina, Keiichiro Kashimura
Summary: The rapid repair of graphene oxide (GO) was demonstrated using a microwave cavity resonator, providing high-quality reduced graphene oxide (rGO). Microwave heating removed impurities and repaired defects more effectively than conventional heating, while suppressing graphitisation. The findings offer guidelines for fast and large-scale production of graphene using microwave-assisted reduction of GO.
Article
Physics, Condensed Matter
Feng-Lin Shyu
Summary: Band structures of armchair graphene nanoribbons (AGNRs) under crossed external fields are calculated using the tight-binding model. The results show that magnetic field and electric field both have significant effects on the band structures, further demonstrating the complex characteristics of these effects on plasmon spectra and reflectance spectra.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Chemistry, Multidisciplinary
Paolo Marconcini, Massimo Macucci
Summary: The effect of an orthogonal magnetic field on transport in graphene devices is studied using a numerical simulator based on the Dirac equation. Different approaches are compared and the extended code is validated by simulating various magnetic-related phenomena.
Article
Chemistry, Multidisciplinary
Florie Mesple, Niels R. Walet, Guy Trambly de Laissardiere, Francisco Guinea, Djordje Dosenovic, Hanako Okuno, Colin Paillet, Adrien Michon, Claude Chapelier, Vincent T. Renard
Summary: The study of moire engineering has advanced with the discovery of van der Waals heterostructures, where stacking 2D layers with different lattice constants controls their electronic properties. Adjusting the twist between two graphene layers leads to new strongly-correlated-electron physics and topological effects. This study explores a novel moire superlattice in bilayer graphene under biaxial heterostrain, uncovering spiraling electronic states and atomic reconstruction. The findings suggest that biaxial heterostrain can be a valuable parameter in moire materials for further engineering advancements.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Ismail Burak Ates, Senguel Kuru, Javier Negro
Summary: This paper proposes a simple method to obtain analytical solutions of the Dirac-Weyl equation for low energy electrons in graphene under certain electric and magnetic fields, with the assistance of a few numerical calculations. By assuming a displacement symmetry and applying certain conditions on the magnetic and electric fields, the resulting equations can be decoupled and expressed in a form suitable for the technique of supersymmetric quantum mechanics. The example of an electric well with a square profile is worked out in detail to illustrate some interesting features of this method.
Article
Physics, Condensed Matter
A. Jbeli, N. Zeiri, N. Yahyaoui, P. Baser, M. Said
Summary: The electronic and optical properties of CdSe/ZnSe semiconductor core/shell quantum dots with hydrogenic donor impurity were investigated theoretically. The perturbation and variational methods were used to calculate the binding energy, photoionization cross-section, polarizability, and diamagnetic susceptibility of the excited impurity under various conditions. A significant stark shift in the binding energy was observed under the influence of an external electric field.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Rahat Batool, Tariq Mahmood, Sajid Mahmood, Abdul Aziz Bhatti
Summary: This study investigates the effects of alkali metal doping (Na, K, Cs) on MAPbI3 through compositional engineering. The results show that doping Na, K, and Cs can improve the phase stability, thermodynamic stability, and optical absorption of MAPbI3.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
N. A. N. M. Nor, M. A. H. Razali, W. H. A. W. K. Annuar, N. N. Alam, F. N. Sazman, N. H. M. Zaki, A. S. Kamisan, A. I. Kamisan, M. H. Samat, A. M. M. Ali, O. H. Hassan, B. U. Haq, M. Z. A. Yahya, M. F. M. Taib
Summary: This study investigates the potential of quaternary chalcogenides semiconductors as thin film solar cell absorbers using density functional theory (DFT) and density functional theory plus Hubbard U (DFT + U) approach. The results show that by applying Hubbard U terms, the electronic band gaps can be accurately predicted, providing valuable insights for finding cost-effective new thin film solar cell materials.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Ashwani Kumar, Anuj Kumar, Mohaseen S. Tamboli, Mohd Ubaidullah, J. Jayarubi, S. K. Tripathi
Summary: In this study, lead-based perovskite solar cells are replaced by bismuth-based perovskite cells to overcome their instability and toxicity. CsBi3I10 perovskite films are fabricated using a modified drop-casting process, and the effects of post-annealing temperature on the morphological, structural, and optical properties are investigated. The photovoltaic performance of the cells without a hole transport layer is also quantitatively evaluated.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Yang Gao, Shu-Ming Chen, Shuo Cao, Shang-Zhou Zhang, Philippe Djemia, Qing-Miao Hu
Summary: This study investigates the phase stability, elastic modulus, and hardness of ternary nitride Ti1-xAlxN. It is found that the hardness increases with the Al content x. The cubic B1 structure is more stable for x < about 0.75, while the hexagonal structure (B4) is more stable for x > about 0.75. The composition dependent hardness and phase decomposition contribute to the convex shaped hardness curve of Ti1-xAlxN.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Fengqi Wang, Qinyan Ye, Xulin He, Kun Luo, Xiaolong Ran, Xingping Zheng, Cheng Liao, Ru Li
Summary: This report uses rigorous calculations based on density functional theory to study the piezoelectric and elastic properties of wurtzite aluminum nitride (w-AlN) with single- and co-alloying by Hf (or Zr) and Sc. The research finds that the (HfSc)0.375Al0.625N and (ZrSc)0.375Al0.625N with stable wurtzite phase have a large piezoelectric coefficient d33 of 49.18 pC/N and 47.00 pC/N, respectively. However, the piezoelectric voltage constant g33 and electromechanical coupling constant k233 of HfAlN, ZrAlN, HfScAlN, and ZrScAlN are smaller than that of ScAlN, which is attributed to the large dielectric constant epsilon 33 of Hf (or Zr) alloying samples. Furthermore, the calculations of internal parameter u and bond angle alpha elucidate the brittle-to-ductile transformation in alloying w-AlN crystal structure. Electronic structure calculations show that the bandgap decreases almost linearly with the increase of alloying concentration, and the Hf (or Zr) alloying compounds become n-type semiconductors due to the existing high-charge states.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
S. R. Athul, K. Arun, S. Swathi, U. D. Remya, Andrea Dzubinska, Marian Reiffers, Nagalakshmi Ramamoorthi
Summary: The magnetic and magnetocaloric characteristics of Ho6FeSb2 have been studied. The compound exhibits two second-order ferromagnetic transitions, enabling hysteresis-free magnetocaloric effect across a wide temperature range. The alloy has high relative cooling power and magnetoresistance, making it suitable for hysteresis-free magnetocaloric applications.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Reena Sharma, Neelam Hooda, Ashima Hooda, Satish Khasa
Summary: A polycrystalline double perovskite La2CoMnO6 sample was prepared and its structural, dielectric and magnetic properties were investigated. The sample exhibited complex structures and magnetic behavior, and showed good conductivity and dielectric performance. Its multi-domain magnetic structure suggests its suitability for memory device applications.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Shubha Dubey, Jisha A. Abraham, Kumud Dubey, Vineet Sahu, Anchit Modi, G. Pagare, N. K. Gaur
Summary: This study investigates the optoelectronic, thermodynamic, thermoelectric, and mechanical stability properties of RhTiP Half Heusler semiconductors. The results show that RhTiP is a non-magnetic material with confirmed mechanical stability. It is found to be an indirect-bandgap semiconductor with a good Seebeck coefficient. This study suggests that RhTiP has promising applications in the thermoelectric and optoelectronic fields.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Xun Xie, Jiong-Ju Hao, Hong-Wei Yang
Summary: This work presents a multilayer film structure that uses optical resonance to prepare highly efficient and saturated red, green, and blue transmittance colors. Numerical simulations and analysis show that the structure can produce R, G, and B colors with a purity comparable to standard RGB colors, while maintaining efficient transmission efficiency and obtaining a rich variety of structural colors. Additionally, a metallic interlayer is introduced to selectively suppress resonances in the short-wavelength region, improving the purity of the red color. The study also investigates the effect of the incidence angle on color purity and transmission efficiency.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Yueqiang Zhao
Summary: Solubility property is of great interest in chemical, physical, pharmaceutical, material, and environmental sciences. Understanding the intrinsic reason behind solubility behavior is a fascinating task. The theoretical relation between binary mutual solubility and liquid-liquid interfacial tension has been derived, where the partitioning of solute molecules between two coexisting liquid phases is determined by the transfer free energy per unit segment for a chain-like solute molecule expressed in terms of solute-solvent interfacial tension. This general theory of solubility is in good agreement with experimental results for binary mutual solubility and molar transfer free energy of solute molecules.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Osama K. M. Bashiar, R. E. Kroon, H. C. Swart, R. A. Harris
Summary: ZnO thin films with near-infrared emission were successfully fabricated using pulsed laser deposition under vacuum conditions, without the need for additional gases or implantation methods. The NIR emission was hypothesized to be caused by defects in the ZnO film due to high energy particle impacts on the sample surface.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
O. Stognei, A. Berezutskii, I. Anisimov, A. Deryabin
Summary: The influence of ZrOn matrix stoichiometry on the electrical and magnetoresistive properties of Fe-Zr-O nanocomposites has been studied. It was found that the magnetoresistive effect is not observed in composites with oxygen lack, while composites with oxygen excess show magnetoresistive effect and increased resistivity. Magnetoresistivity in composites with oxygen lack only appears after heat treatment. These results can be explained by the difference in the density of localized states in the oxide matrix of the composites and the ratio between two types of conductivity.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Mehmet Bayirli, Aykut Ilgaz, Orhan Zeybek
Summary: The present study aims to understand the relationship between impedance characteristics and fractal behaviors. By producing neat and carbon nanotube doped composite specimens, the researchers investigated the electrical properties and surface heteromorphology using Nyquist plots and fractal analysis.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
M. I. Khan, Saddam Hussain, Muhamad Saleem, Fatimah Mohammed Alzahrani, Muhammad Siddique, M. S. Hassan, Allah Ditta Khalid, Munawar Iqbal
Summary: The sol-gel method was used to deposit Ti-doped MAPbBr3 films on FTO-glass substrates with different doping ratios (0%, 4%, and 6%). XRD analysis confirmed the cubic structure of all films, and the 4% Ti-doped film exhibited a large grain size, low band gap energy, and high refractive index. Solar cells fabricated using the 4% Ti-doped MAPbBr3 film showed improved performance in terms of current density, open circuit voltage, fill factor, and efficiency.
PHYSICA B-CONDENSED MATTER
(2024)