Article
Chemistry, Multidisciplinary
Riya Sebait, Chandan Biswas, Bumsub Song, Changwon Seo, Young Hee Lee
Summary: This study reports defect-induced A-trions and B-trions in monolayer tungsten disulfide (WS2) and compares their binding energies with trions and neutral excitons. The defect-induced trions are strongly coupled with inherent hole traps and show increased prominence in rhenium-doped WS2. Furthermore, the investigation allows for localization of defect-induced trion binding energies via spatial mapping in the WS2 monoflake regions, distinct from the flake edges.
Article
Materials Science, Multidisciplinary
Farhan Rana, Okan Koksal, Minwoo Jung, Gennady Shvets, Christina Manolatou
Summary: This paper investigates the radiative lifetimes of exciton-trion superposition energy eigenstates in doped 2D materials, finding that they are strongly dependent on doping density. It also points out that the two peaks in the optical emission spectra, as well as in the optical absorption spectra, originate from the Coulomb coupling between excitons and trions in doped 2D materials.
Article
Chemistry, Multidisciplinary
Suhui Wang, Tengxiao Guo, Shuya Cao
Summary: HgSe quantum dots were synthesized using a thermal injection method, and the effects of material ratio, growth time, and reaction temperature on their growth and spectral properties were investigated. The results showed that the highest yield was achieved with a molar ratio of 1.5 for Se source to Hg source. Increasing the reaction temperature led to an increase in the critical radius and spectral red-shift rate. Different particle morphologies could be obtained by varying the growth time.
Article
Chemistry, Multidisciplinary
Albert F. Vong, Shawn Irgen-Gioro, Yue Wu, Emily A. Weiss
Summary: Colloidal semiconductor nanoplatelets are scalable materials for optoelectronic applications and can be used for spin-to-photon transduction in quantum information networks. Negative trions are appealing emitters, but more preparation knowledge is needed to use them as single photon-emitting states. Through power-dependent time-resolved transient absorptions, it was shown that trions form via biexciton decay and not through collisional mechanisms typical for 2D materials.
Article
Physics, Applied
G. Vignesh, A. Sakthi Balaji, S. M. Mahalakshmi, P. Kalpana, C. Raja Mohan
Summary: This paper theoretically studies the diamagnetic susceptibility and binding energy of a hydrogenic donor in a GaAs/AlGaAs quantum well wire (QWW) under the influence of laser field, QWW geometry, and non-parabolicity. The results show that changing the QWW geometry enhances quantum confinement effects, while increasing the laser field reduces the binding energy. The diamagnetic susceptibility can serve as a tool to evaluate the stability and Mott transition of donors in the QWW. Furthermore, the study finds that the binding energy remains constant until reaching a critical concentration (Nc), while the diamagnetic susceptibility undergoes a drastic fall after Nc, indicating a Stoner magnet transition (SMT) in the system.
MODERN PHYSICS LETTERS B
(2023)
Article
Energy & Fuels
Marvin Masche, Maria Puig-Arnavat, Peter A. Jensen, Jens Kai Holm, Sonnik Clausen, Jesper Ahrenfeldt, Ulrik B. Henriksen
Summary: This study investigates the influence of wood pellet properties on the grindability of pellets using a lab-scale disc mill. The study found that drying pellets increased their brittleness and improved their grindability, with a larger impact on industrial pellets. Beech pellets had better grindability than pine pellets.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Chemistry, Physical
Sergii Golovynskyi, Oleksandr I. Datsenko, Dan Dong, Yan Lin, Iuliia Golovynska, Zijing Jin, Baikui Li, Honglei Wu
Summary: This study examines the photo-luminescence of 1L-QD/MoS2 hybrid and compares it to bare 1L MoS2. The results show that the PL intensity is significantly enhanced in the 1L-QD/MoS2 hybrid. This enhancement is attributed to nonradiative energy transfer and charge transfer processes.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Shalini Singh, I. A. Palani, Shirin Dehgahi, C. P. Paul, K. G. Prashanth, A. J. Qureshi
Summary: To address the issues of excessive heat build-up and process instability in Wire Arc Additive Manufacturing (WAAM), the researchers optimized the interlayer temperature of NiTi walls and conducted related tests. The results showed that regulating the interlayer temperature below 300 degrees C, preferably at 200 degrees C, improved the mechanical characteristics, reduced porosity content, and enhanced the microstructure of the NiTi walls. This research is of great significance for the development and improvement of WAAM techniques for manufacturing high-quality NiTi SMA components.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Mechanical
Wen-Chao Sui, Yong-Chen Pei, Bao-Hua Wang, Si-Jia Liu, Ji-Tuo Wu, Huiqi Lu
Summary: Superelastic shape memory alloy wire has been found to have the property of energy storage and release, which can be quantitatively measured using electrical resistance. This finding has significant potential and advantages in the field of mechanical energy storage and ejection release.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Multidisciplinary Sciences
Rahul Kesarwani, Kristan Bryan Simbulan, Teng-De Huang, Yu-Fan Chiang, Nai-Chang Yeh, Yann-Wen Lan, Ting-Hua Lu
Summary: Controlling the density of exciton and trion quasiparticles in monolayer two-dimensional materials at room temperature by nondestructive techniques is highly desired. In this study, the effects of different orbital angular momentum lights on monolayer tungsten disulfide were investigated, revealing enhanced exciton intensity and suppressed trion intensity in the photoluminescence spectra with increasing topological charge of the OAM light.
Article
Physics, Multidisciplinary
P. Henzler, C. Traum, M. Holtkemper, D. Nabben, M. Erbe, D. E. Reiter, T. Kuhn, S. Mahapatra, K. Brunner, D. Seletskiy, A. Leitenstorfer
Summary: The study examines ultrafast transmission changes around the fundamental trion resonance in a negatively charged II-VI quantum dot after exciting a p-shell exciton. The biexcitonic induced absorption reveals quantum beats between hot-trion states at 133 GHz. The relaxation of the P-shell hole within 390 fs dominates interband dephasing, while trionic coherence remains stored in the spin system for 85 ps due to Pauli blocking of the triplet electron.
PHYSICAL REVIEW LETTERS
(2021)
Article
Instruments & Instrumentation
Danial Davarnia, Shaohong Cheng, Niel Van Engelen
Summary: Shape memory alloys (SMAs) are a new generation of smart metallic materials with unique characteristics. Preloading SMA wires for mechanical training is proposed to overcome the functional fatigue drawback and achieve stable mechanical properties. The influence of different training parameters, such as strain amplitude, frequency, number of cycles, and prestrain, on the mechanical behavior of SMA wires is examined, with training frequency being the most important parameter for eliminating residual strain.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Automation & Control Systems
Zongqiang Li, Peiqi Ge, Wenbo Bi, Long Li, Chengyun Li
Summary: This paper investigates the effect of anisotropy on surface shape deviation during slicing of KDP crystal using a diamond wire saw. A model considering the anisotropy of KDP crystal is established, which shows the potential to reduce surface shape deviation caused by anisotropic properties.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Zongqiang Li, Peiqi Ge, Wenbo Bi, Chengyun Li, Chao Wang, Jianfeng Meng
Summary: This paper investigates the influence of anisotropy and surface shape deviation on the cutting process of single crystal silicon, and verifies the effect of feed angle of the diamond wire saw on surface shape deviation through experiments. It proposes methods to reduce the impact of silicon anisotropy and surface shape deviation.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
M. B. Yucel, S. Sakiroglu, H. Sari, C. A. Duque, E. Kasapoglu
Summary: This study theoretically investigates the ground-state binding energy and optical absorption coefficient of excitons in a symmetric double inverse parabolic quantum well system under external electric and magnetic fields. The results reveal that the exciton binding energy and interband optical absorption depend on the parameters defining the confinement potential, as well as the aluminum concentration, electric field, and magnetic field. The tunability of excitonic effects is expected to be crucial for the development of stable and efficient nanoscale excitonic optoelectronic devices.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
