Article
Astronomy & Astrophysics
H. Ernandes, B. Barbuy, A. Friaca, V Hill, M. Spite, F. Spite, B. Castilho, C. J. Evans
Summary: The study reveals that the metal-poor star CS 31082-001 is rich in r-process and actinide elements, with the first measurement of uranium abundance in an old star. The abundance estimates of beryllium, vanadium, and copper in CS 31082-001 are presented, showing that beryllium is low due to the cool temperature, while vanadium and copper have comparable abundances to other metal-poor stars. New chemical evolution models are proposed to investigate the results, and the study also explores other atomic lines in the near-ultraviolet for future studies of metal-poor stars.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Physics, Applied
Yuming Qi, Tengwu He, Miaolin Feng
Summary: The impact of chemical compositions on the mechanical properties and microstructure evolution of single-crystal FCC CoCrFeNi-based high-entropy alloys was investigated through molecular dynamics simulation in nanoindentation. The addition of Cu and Mn elements influences the stacking faults energy and dislocation-mediated deformation. The total number of chemical compositions plays a critical role in the results, showing significant effects on plastic deformation, indentation force and hardness of the high-entropy alloys.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Mechanics
Zi-Yu Liu, Lin Chen, Haisheng Chen
Summary: The research explores the behavior of CO2 fluid near the pseudo-critical line through molecular dynamics simulation, revealing regularity and characteristics different from the conventional phase-analogy method.
Article
Astronomy & Astrophysics
Travis Dore, Jamie M. Karthein, Isaac Long, Debora Mroczek, Jacquelyn Noronha-Hostler, Paolo Parotto, Claudia Ratti, Yukari Yamauchi
Summary: In this study, the lensing effect of the QCD critical point on hydrodynamic trajectories and its impact on the net-proton kurtosis kappa 4 are investigated. The size and shape of the critical region are found to directly determine the survival of the signal during the dynamical evolution.
Article
Engineering, Environmental
Peter J. Wlasits, Ruth Konrat, Paul M. Winkler
Summary: Nanoplastic pollution caused by atmospheric transport is a global environmental problem. This study focuses on the physicochemical properties of aerosol nanoplastic particles and their behavior in the atmosphere. The experiments showed a strong material dependence of the nucleation process and a significant effect of additives from commodity plastics. The results also highlighted the importance of nucleation temperature. This study provides important insights for the detection and assessment of nanoplastic dispersion in the atmosphere.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Peter J. Wlasits, Ruth Konrat, Paul M. Winkler
Summary: Nanoplastic pollution is a global environmental problem caused by the dispersion of aerosolized nanoplastics through atmospheric transport. However, there is limited knowledge about the physicochemical properties of aerosol nanoplastic particles. This study investigates the heterogeneous nucleation of supersaturated water vapor on sub-10 nm polyethylene terephthalate (PET) seeds and finds a material dependence of nucleation behavior, as well as a strong dependence on nucleation temperature. These findings contribute to the understanding of airborne nanoplastic detection and assessing the impact of nanoplastic dispersion on atmospheric processes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Naba K. Rana, Arun Kumar, Manas Ranjan Samantaray, Nikhil Chander, Dhriti S. Ghosh
Summary: Choosing the right anti-solvent is crucial for fabricating high-efficiency and stable perovskite solar cells. The perovskite film prepared with anti-solvent CB, which has a higher boiling point and lower polarity, exhibits the best efficiency, low hysteresis, and improved reproducibility.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Chemistry, Multidisciplinary
Martin M. Botana, Manuel V. Ramallo
Summary: This study investigates the critical fluctuations near the resistive transition in very thin films of high-temperature cuprate superconductors. The fluctuation spectrum of a Gaussian-Ginzburg-Landau model is solved, considering two alternating Josephson interlayer interaction strengths, to obtain the paraconductivity above the transition. These calculations are then extended to temperatures below the transition using expressions for the Ginzburg number and Kosterlitz-Thouless-like critical region. The results provide a plausible scenario for the critical regime in YBa2Cu3O7-delta few-bilayers systems.
Article
Chemistry, Physical
Ruslan A. Andrianov, Juern W. P. Schmelzer, Rene Androsch, Timur A. Mukhametzyanov, Christoph Schick
Summary: The specific features of crystal nucleation have a significant impact on the morphology of the crystalline material. Due to their small size and stochastic nature, it is usually difficult to observe the development of nuclei directly. However, an experimental approach using fast scanning calorimetry has been developed to determine the specific features of the cluster size distribution. This approach allows for estimating the time evolution of the largest detectable clusters in the distribution and determining their radial growth rate.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Materials Science, Ceramics
R. A. Konchakov, A. S. Makarov, G. V. Afonin, J. C. Qiao, M. G. Vasin, N. P. Kobelev, V. A. Khonik
Summary: The high-frequency shear modulus of different metallic glasses was measured and fluctuations in thermal energy near the glass transition were observed, suggesting characteristics of a continuous phase transition.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Physical
Paramita Ghosh, Nidhi Gupta, Monika Dhankhar, Madhav Ranganathan
Summary: The self-organization of germanium islands on a silicon(001) substrate is influenced by temperature and coverage, leading to variations in the size and shape distribution of the islands. Changes in temperature result in different island formation mechanisms, affecting the surface roughness.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Engineering, Environmental
Bin Zhao, Jerome D. Fast, Neil M. Donahue, Manish Shrivastava, Meredith Schervish, John E. Shilling, Hamish Gordon, Jian Wang, Yang Gao, Rahul A. Zaveri, Ying Liu, Brian Gaudet
Summary: The study found that urban pollution can increase particle number concentration in the downwind region by 5-25 times, with new particle formation (NPF) mechanisms contributing over 70% of particle number in that region. Among various NPF mechanisms, ternary NPF involving organics and sulfuric acid overwhelmingly dominates.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
L. Michels, A. J. F. Pires, C. A. S. Ribeiro, B. Kroka, E. G. Hoel, E. Ott, C. Hartung
Summary: Non-metallic microparticles play an important role in the mechanical properties and nucleation of the graphite phase in iron-carbon-silicon alloys. This study investigates the effects of inoculants on the overall distribution of microparticles and quantifies their statistical parameters using 2D to 3D conversions. The results suggest that sulfides are critical for graphite nucleation, but other fading mechanisms also need to be considered.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Astronomy & Astrophysics
Kai-Jia Sun, Che Ming Ko, Shanshan Cao, Feng Li
Summary: By introducing a scalar-vector coupled interaction in the NJL model, the location of the critical point in the QCD phase diagram, especially the critical temperature, can be significantly affected. This allows for extracting information about the QCD phase diagram from relativistic heavy-ion collisions using NJL-based transport or hydrodynamic models.
Article
Optics
Dmitriy S. Shapiro, Sergey Remizov, Andrey Lebedev, Danila Babukhin, Ramil S. Akzyanov, Andrey A. Zhukov, Leonid Bork
Summary: This paper investigates the interplay of disorder and topological ordering in the Su-Schrieffer-Heeger (SSH) model, particularly in the case of random intercell hopping amplitudes. By calculating the average of the Z(2) topological invariant upsilon, based on the non-Hermitian part of the total Hamiltonian, we determine the analytical form of the critical surface and the finite-size fluctuations of upsilon for arbitrary disorder strength. Numerical simulations are used to study the formation of edge modes and the suppression of the energy gap at the transition in finite-size systems. Furthermore, we discuss a band-touching condition derived from the averaged Green's function method for the thermodynamic limit.
Article
Physics, Applied
Zhen Jiao, Harold J. W. Zandvliet
Summary: The Fermi velocity of graphene on MoS2 was measured using dual mode scanning tunneling spectroscopy, revealing a moire structure and intact electronic band structure of graphene in the bandgap region of MoS2. The determined Fermi velocity of graphene on MoS2 is 1.2 +/- 0.1 x 10^6 m/s.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Martina Tsvetanova, Alexey G. Syromyatnikov, Harold J. W. Zandvliet, Andrey L. Klavsyuk, Kai Sotthewes
Summary: In this study, scanning tunneling microscopy was used to investigate the behavior of decanethiol on Au(001) at low coverage. It was found that no ordered phases of decanethiol form on the surface. Instead, a disordered phase consisting of diffusing Au adatoms, decanethiol molecules, and/or Au-adatom-decanethiol molecule complexes was observed. Density functional theory calculations showed that the activation barrier for diffusion is lower when Au-adatom-molecule complexes are considered. These results suggest that Au adatoms expelled during the lifting of the hex reconstruction may play a role in the diffusion of thiol molecules on this surface.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Zhiguo Zhang, Bene Poelsema, Harold J. W. Zandvliet, Arie van Houselt
Summary: In this study, we utilize various techniques to investigate the critical stages of cooling of large eutectic droplets. The changes in droplet surface area and unexpected transformations in the internal structure are observed. Additionally, spaghetti-like patterns are discovered during the process when the eutectic temperature is exceeded.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Yuxuan Sun, Zhen Jiao, Harold J. W. Zandvliet, Pantelis Bampoulis
Summary: In this study, conductive atomic force microscopy was used to investigate charge carrier injection in metal-GeS nanocontacts. Three dominant injection mechanisms were identified: thermionic emission, direct tunneling, and Fowler-Nordheim tunneling. The Schottky barrier was found to be independent of the metallic tip's work function, indicating strong Fermi-level pinning.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Martina Tsvetanova, Alexey G. Syromyatnikov, Thomas van der Meer, Arie van Houselt, Harold J. W. Zandvliet, Andrey L. Klavsyuk, Kai Sotthewes
Summary: The study identified different structures of self-assembled monolayers on the Au(001) surface, including planar, striped, and disordered regions. The findings are significant for understanding the family of decanethiol formations on different gold surfaces.
Article
Physics, Fluids & Plasmas
Binglin Zeng, Yuliang Wang, Christian Diddens, Harold J. W. Zandvliet, Detlef Lohse
Summary: The paper presents a new droplet dissolution behavior, where the dissolution dynamics is controlled by local heating of the liquid, resulting in a thermal Marangoni flow around the droplet. By experimentally and theoretically studying the process, it is found that there is a relationship between the dissolution rate and the initial radius of the droplet.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Chemistry, Physical
Dennis J. Klaassen, Carolien Castenmiller, Harold J. W. Zandvliet, Pantelis Bampoulis
Summary: The Ge(110) surface can reconstruct into ordered and disordered phases with a five-membered ring of Ge atoms as the basic unit. Different surface reconstructions result in a rich electronic density of states and several surface states. Through scanning tunneling microscopy and spectroscopy, we have identified the exact origins of these surface states and connected them to either the Ge pentagons or the underlying Ge-Ge bonds. We have shown that even small fluctuations in the positions of the Ge pentagonal units can cause significant variations in the local density of states. The precise modulation of the local density of states follows the geometrical constraints of tiling Ge pentagons. These geometry-correlated electronic states provide a vast configurational landscape that could have applications in data storage and computing.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Physics, Multidisciplinary
Pantelis Bampoulis, Carolien Castenmiller, Dennis J. Klaassen, Jelle van Mil, Yichen Liu, Cheng-Cheng Liu, Yugui Yao, Motohiko Ezawa, Alexander N. Rudenko, Harold J. W. Zandvliet
Summary: We provide experimental evidence of a topological phase transition in germanene, a monoelemental quantum spin Hall insulator. By applying a critical perpendicular electric field, the topological gap is closed and germanene becomes a Dirac semimetal. Further increasing the electric field results in the opening of a trivial gap and the disappearance of metallic edge states. This switching of the topological state induced by an electric field, combined with the large gap, makes germanene suitable for room-temperature topological field-effect transistors, which could revolutionize low-energy electronics.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Physical
Jort D. Verbakel, Annelies Dekker, Harold J. W. Zandvliet, Pantelis Bampoulis
Summary: By using photoconductive atomic force microscopy, we have observed a local enhancement of photoconductivity on a bilayer molybdenum disulfide on mica system, where water is present between the TMDC and the substrate. The structural phase of the water influences the doping level and thus the tunneling barrier at the nanojunction, leading to an increase in photocurrent and enhanced photopower generation.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Instruments & Instrumentation
K. Vonk, J. D. Verbakel, R. Huijink, H. J. W. Zandvliet
Summary: This work demonstrates a method for electrical transport measurements on small graphene flakes using a collinear micro-four-point probe, eliminating the need for fabricating electrodes on top of the flakes. Measurements on graphene on silicon oxide and hexagonal boron nitride show good agreement with conventional transport measurements in terms of charge carrier mobilities and minimum conductivity. The possible damage caused by landing these probes on graphene is also assessed.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Letter
Chemistry, Multidisciplinary
Pantelis Bampoulis, Harold J. W. Zandvliet
Article
Engineering, Electrical & Electronic
Yorick A. Birkholzer, Kai Sotthewes, Nicolas Gauquelin, Lars Riekehr, Daen Jannis, Emma van der Minne, Yibin Bu, Johan Verbeeck, Harold J. W. Zandvliet, Gertjan Koster, Guus Rijnders
Summary: Vanadium dioxide (VO2) is a promising material for electronic and optical switching due to its semiconductor-metal transition. In this study, we demonstrate the reversible manipulation and monitoring of VO2's semiconductor-to-metal transition using a nanosized metallic probe. The direct tunneling mechanism through the VO2-metal contact is observed, and the necessary pressure for the transition decreases with temperature. Our findings also provide valuable insights into oxide electronics for future design.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Harold J. W. Zandvliet, Qirong Yao, Lijie Zhang, Pantelis Bampoulis, Zhen Jiao
Summary: This paper presents a new method to quantitatively investigate the dispersion relation of low-energy electrons in monoelemental group-IV 2D Dirac materials using conventional current-voltage spectroscopy. The method requires placing the 2D material on a substrate with a band gap and maintaining a constant density of states of the scanning tunneling microscopy tip.
Article
Chemistry, Physical
Marvin Detert, Yibo Chen, Harold J. W. Zandvliet, Detlef Lohse
Summary: Multi-component fluids with phase transitions exhibit rich physics phenomena. In this study, we investigate the transition of growth mode in plasmonic bubbles in binary liquids. The transition occurs as the three-phase contact line reaches the spinodal temperature of the more volatile component, leading to selective evaporation and the onset of convective growth.
Article
Materials Science, Multidisciplinary
Liesbeth Mulder, Carolien Castenmiller, Femke J. Witmans, Steef Smit, Mark S. Golden, Harold J. W. Zandvliet, Paul L. de Boeij, Alexander Brinkman
Summary: The electronic structure of high-quality thin films of the topological insulator (Bi0.4Sb0.6)(2)Te-3 deposited on SrTiO3 (111) has been investigated. The experimental results show similarities with theoretical calculations and reveal the presence of topological surface states and quantized dispersive bulk energy levels.
