Article
Environmental Sciences
G. Harini, Asad Syed, M. Kalil Rahiman, Ali H. Bahkali, Abdallah M. Elgorban, Rajender S. Varma, S. Sudheer Khan
Summary: This study developed a hierarchical fabrication of oxygen vacancy enriched ZnO/ZnMn2O4/ZnS-PVA nanocomposite for enhanced photodegradation of rifampicin and cotrimoxazole. The formation of lattice expansion induced oxygen vacancies and n-p-n heterojunction-based S-scheme charge transfer path contributed to the boosted photocatalytic performance.
Article
Chemistry, Physical
Joel Y. Y. Loh, Moein Shayegannia, Nazir P. Kherani
Summary: The study shows that doping with bismuth as a substitution of indium can significantly increase the CO production rate in the reverse water gas shift reaction under illumination, enhancing the photo-thermalization effect. High-doped In2O3-x(OH)(y) materials exhibit a longer persistent CO yield post-illumination, with increased yield, while low-doped and undoped systems have shorter duration and lower yield. Additionally, undoped systems show a slower decay trend in photocurrent for 1-2 hours, while high-doped systems exhibit a decay trend of more than 2 hours.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Physics, Applied
Shunsuke Tsuna, Yoshihiro Gohda
Summary: First-principles investigations reveal that the presence of B in neodymium-magnet compounds leads to acoustic phonon hardening. Substituting B with other light elements results in a decrease in phonon frequencies with increasing atomic number. However, imaginary phonons in Nd2Fe14F are attributed to electronic states and atomic configurations, rather than the heavier mass of F. Additionally, the study shows that magnetic disordering reduces the softening of phonons in paramagnetic Nd2Fe14B compared to ferromagnetic Nd2Fe14B, suggesting that phonon effects decrease the Curie temperature by stabilizing the paramagnetic state.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Christian Gehrmann, Sebastian Caicedo-Davila, Xiangzhou Zhu, David A. Egger
Summary: This study investigates the optoelectronic properties of halide perovskites using first-principles molecular dynamics. The results show that these materials exhibit dynamic flexibility and vibrational anharmonicity, which are favorable for rapid optical absorption. In comparison to other materials, halide perovskites have sharper optical absorption profiles, possibly due to their unique vibrational characteristics.
Article
Physics, Multidisciplinary
Zhongwei Zhang, Yangyu Guo, Marc Bescond, Jie Chen, Masahiro Nomura, Sebastian Volz
Summary: Understanding and quantifying the coherence of thermal excitations is an important problem in physics. The traditional phonon gas model fails to capture this coherence. In this study, a new heat conduction formalism is proposed that combines the phonon gas model and the wave nature of thermal phonons. The theory and simulations reveal two types of coherence in different temperature ranges.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Mayanak K. Gupta, Jingxuan Ding, Naresh C. Osti, Douglas L. Abernathy, William Arnold, Hui Wang, Zachary Hood, Olivier Delaire
Summary: By investigating the phonons in Na3PS4 and their coupling to fast sodium diffusion, key anharmonic phonon modes controlling the diffusion process were identified at the Brillouin zone boundary of the anharmonically stabilized cubic phase. Detailed insights into the dynamic mechanism of fast sodium diffusion were provided, offering a pathway to search for further sodium solid electrolytes.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Multidisciplinary Sciences
Shuyi Liu, Adnan Hammud, Ikutaro Hamada, Martin Wolf, Melanie Mueller, Takashi Kumagai
Summary: Coherent phonon spectroscopy is a method to study ultrafast lattice dynamics and its coupling to other degrees of freedom. In this study, nanoscale coherent phonon spectroscopy was achieved using ultrafast laser-induced scanning tunneling microscopy in a plasmonic junction. The localized excitation of coherent phonons in ultrathin zinc oxide films and their detection via photoinduced tunneling current through an electronic resonance allowed for the observation of nanoscale spatial variations in phonon dynamics that correlated with the distribution of electronic local density of states resolved by scanning tunneling spectroscopy.
Article
Materials Science, Multidisciplinary
Leelavati, Rajesh Kumar, Ravi Kumar
Summary: The study investigated the impact of different doping concentrations of Mn2+ ions on the properties of CdO, revealing changes in lattice structure, electron concentration, band gap, and Urbach energy with increasing doping concentration.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Engineering, Electrical & Electronic
M. Nagaraja, P. Raghu, H. M. Mahesh, Jayadev Pattar
Summary: The study fabricated and analyzed thin films of ITO/CdS and ITO/ZnO/CdS bi-layer, demonstrating that ITO/ZnO/CdS films exhibit better structural and optical properties compared to ITO/CdS films.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Review
Chemistry, Physical
Sokseiha Muy, Roman Schlem, Yang Shao-Horn, Wolfgang G. Zeier
Summary: This review focuses on the influence of lattice dynamics on ionic mobility in solid-state Li-ion conductors, discussing the relationship between lattice dynamics and activation energy, as well as presenting new strategies for tuning ionic conductivity based on these concepts. Utilizing historical theories and recent computational methods, the review provides insights into the correlation between lattice dynamics and pre-exponential factors in ion migration.
ADVANCED ENERGY MATERIALS
(2021)
Article
Physics, Applied
Z. X. Xue, Y. Qu, S. L. Ban
Summary: The Mg mole fraction (x) in MgxZn1-xO shells has an impact on the electron mobility in ZnO nanowires. In this study, we investigated the phase transformation in MgZnO shells and found that electron mobility can be effectively enhanced with x below 0.057. However, once x exceeds 0.057, the propagating optical phonons are transformed, resulting in a drastic drop in electron mobility.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Mechanics
Weiming Ji, Mao See Wu
Summary: The research reveals that as the crack length increases, the Young's modulus and yield stress of Cantor alloys decrease, while the work of fracture increases. The formation of nanosized cavities in front of the crack tip and the subsequent crack propagation through cavity coalescence results in ductile fracture of Cantor alloys at cryogenic temperatures.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Physics, Multidisciplinary
Nuri Yazdani, Maryna I. Bodnarchuk, Federica Bertolotti, Norberto Masciocchi, Ina Fureraj, Burak Guzelturk, Benjamin L. Cotts, Marc Zajac, Gabriele Raino, Maximilian Jansen, Simon C. Boehme, Maksym Yarema, Ming-Fu Lin, Michael Kozina, Alexander Reid, Xiaozhe Shen, Stephen Weathersby, Xijie Wang, Eric Vauthey, Antonietta Guagliardi, Maksym V. Kovalenko, Vanessa Wood, Aaron M. Lindenberg
Summary: Understanding the electron-phonon coupling in lead halide perovskites is important for interpreting and utilizing their optical and electronic properties. This study shows that photoexcitation leads to lattice reorganization through deformation potential coupling to low-energy optical phonons. The coupling strength is stronger in FAPbBr3 due to its disordered crystal structure. The reorganizations induced by each exciton in a multi-excitonic state constructively interfere, resulting in a coupling strength that scales quadratically with the exciton number.
Article
Materials Science, Multidisciplinary
Yong He, Jing Lu, Xinqiang Wang, Jun-jie Shi
Summary: This article proposes a design strategy for achieving superconductivity at ambient pressure by constructing few-hydrogen metal-bonded perovskite hydrides, such as Al4H, to address the challenge of high-pressure sample preparation. It predicts that Al4H has a favorable critical temperature Tc of up to 54 K under ambient pressure.
Article
Engineering, Electrical & Electronic
R. Ben Said, N. Moutia, B. Louati, K. Guidara, K. Khirouni
Summary: New Zn2P2O7, K2ZnP2O7, and KZn1.5P2O7 compounds were synthesized using the conventional solid-solid reaction method. Their optical properties were investigated using UV-Visible spectrophotometer, revealing the optical band gaps and other optical parameters.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Physics, Applied
Matthew D. McCluskey
JOURNAL OF APPLIED PHYSICS
(2020)
Editorial Material
Physics, Applied
Matthew D. McCluskey, Anderson Janotti
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Nanoscience & Nanotechnology
Jeffrey Lapp, Dinesh Thapa, Jesse Huso, Amrah Canul, M. Grant Norton, Matthew D. McCluskey, Leah Bergman
Article
Multidisciplinary Sciences
Jesse Huso, Matthew D. McCluskey, Yinchuan Yu, Md Minhazul Islam, Farida Selim
SCIENTIFIC REPORTS
(2020)
Article
Instruments & Instrumentation
Yinchuan Yu, Matthew D. McCluskey
Summary: This paper discusses a method for identifying substances from their photoluminescence spectra using machine learning, with a high accuracy rate of over 90% and successfully identifying a mixed Ga2O3/ZnO sample.
APPLIED SPECTROSCOPY
(2022)
Article
Materials Science, Coatings & Films
Syeed E. Ahmed, Violet M. Poole, John Igo, Yi Gu, Matthew D. McCluskey
Summary: This paper investigates the laser-induced phase transitions of titanium dioxide thin films. Raman mapping reveals the formation of crystalline microstructures due to laser treatment, and the phase of crystalline regions depends on ambient conditions (vacuum versus air).
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2021)
Article
Crystallography
Jani Jesenovec, Cassandra Remple, Jesse Huso, Benjamin Dutton, Parker Toews, Matthew D. McCluskey, John S. McCloy
Summary: Cu doping in β-Ga2O3 shows significant incorporation even with Cu evaporation, with measured high resistivities and segregation of Cu2O in part of the material. Excited crystals exhibit rapid photodarkening and decreased resistivity with sufficient Cu concentration.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Physics, Applied
Christopher Pansegrau, Matthew D. McCluskey
Summary: Annealed bulk crystals of barium titanate exhibit persistent photoconductivity at room temperature, which is characterized by the appearance of a broad infrared absorption peak and a reduction in electrical resistance. The mechanisms for PPC in barium titanate are similar to that of strontium titanate.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Syeed E. Ahmed, Violet M. Poole, Jani Jesenovec, Benjamin L. Dutton, John S. McCloy, Matthew D. McCluskey
Summary: Annealing Ba1-xCaxTiO3 (BCTO) under a flowing humid 2% hydrogen-argon gas mixture results in room-temperature persistent photoconductivity (PPC). This is attributed to the presence of substitutional hydrogen impurities that can be photoexcited. The threshold photon energy for PPC in BCTO is lower than that of BaTiO3 and SrTiO3, and the effect is reversible upon annealing in air.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Hyun-Soo Lee, Mohammad Wahidur Rahman, Darpan Verma, Violet M. Poole, Roberto C. Myers, Matthew D. McCluskey, Siddharth Rajan
Summary: In this study, a method to achieve selectively patterned Mg-doped GaN layers using hydrogen drive-in through PECVD SiNx films is demonstrated. The method selectively deactivates activated Mg-doped GaN layers through low-temperature annealing and is optically verified through spatially resolved photoluminescence measurements.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2022)
Article
Engineering, Electrical & Electronic
Jacob R. Ritter, Marilia J. Caldas, Tales J. da Silva, Arrigo Calzolari, Matthew D. McCluskey
ACS APPLIED ELECTRONIC MATERIALS
(2020)
Article
Engineering, Electrical & Electronic
Syeed E. Ahmed, Jesse Huso, Jacob R. Ritter, John Igo, Yi Gu, Matthew D. McCluskey
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2020)
Article
Materials Science, Multidisciplinary
Amrah Canul, Dinesh Thapa, Jesse Huso, Leah Bergman, Richard Vaughan Williams, Ruprecht Machleidt